diff --git a/frontend/package.json b/frontend/package.json
index 6f301b1..742db2c 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -12,7 +12,9 @@
     "preview": "vite preview",
     "lint": "eslint .",
     "test": "vitest run",
-    "seo:generate": "node scripts/merge-keywords.mjs && node scripts/generate-seo-assets.mjs"
+    "seo:generate": "node scripts/merge-keywords.mjs && node scripts/generate-seo-assets.mjs",
+    "lint:i18n": "node scripts/check-i18n-keys.mjs",
+    "lint:hardcoded": "node scripts/check-hardcoded-text.mjs"
   },
   "dependencies": {
     "@microsoft/clarity": "^1.0.2",
diff --git a/frontend/scripts/check-hardcoded-text.mjs b/frontend/scripts/check-hardcoded-text.mjs
new file mode 100644
index 0000000..a494c6c
--- /dev/null
+++ b/frontend/scripts/check-hardcoded-text.mjs
@@ -0,0 +1,127 @@
+/**
+ * check-hardcoded-text.mjs
+ * Scans shared/layout components for hardcoded English UI strings that should
+ * be replaced with t() calls.
+ *
+ * Heuristic: a JSX text node is flagged when it:
+ *   - contains at least one space (multi-word)
+ *   - is longer than 3 characters
+ *   - starts with an uppercase letter or common English word
+ *   - is NOT already wrapped in {t(...)}
+ *   - is NOT a CSS class, URL, comment, code attribute, or aria-label value
+ *
+ * Usage: node scripts/check-hardcoded-text.mjs
+ * Exit code 1 if any potential hardcoded strings are found.
+ */
+
+import { readFileSync, readdirSync, statSync } from 'node:fs';
+import { join, relative } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = fileURLToPath(new URL('.', import.meta.url));
+const ROOT = join(__dirname, '..');
+
+/** Directories to scan */
+const SCAN_DIRS = [
+  join(ROOT, 'src', 'components', 'shared'),
+  join(ROOT, 'src', 'components', 'layout'),
+];
+
+// Collect .tsx files
+function* walkFiles(dir) {
+  for (const entry of readdirSync(dir)) {
+    const full = join(dir, entry);
+    if (statSync(full).isDirectory()) {
+      yield* walkFiles(full);
+    } else if (/\.tsx$/.test(entry)) {
+      yield full;
+    }
+  }
+}
+
+/**
+ * Patterns that indicate the string is NOT a hardcoded UI label:
+ *  - Only digits/punctuation
+ *  - Looks like a URL, path, class name, CSS value
+ *  - Already inside {t(…)}
+ *  - Attribute values like className, href, src, id, type, etc.
+ */
+const SKIP_RE = [
+  /^[\d\s.,/:%-]+$/,          // pure numbers/punctuation
+  /^https?:\/\//,             // URLs
+  /^\/[a-z]/,                 // paths
+  /^[a-z][-a-z0-9]*$/,        // single lowercase word (CSS class, attr value)
+  /^[a-z][a-zA-Z0-9]*=[a-z]/, // key=value attrs
+];
+
+function shouldSkip(str) {
+  const trimmed = str.trim();
+  if (trimmed.length <= 3) return true;
+  if (!/\s/.test(trimmed)) return true;  // single word
+  if (!/[A-Z]/.test(trimmed[0])) return true; // doesn't start with uppercase
+  for (const re of SKIP_RE) if (re.test(trimmed)) return true;
+  return false;
+}
+
+/**
+ * Find JSX text content that is hardcoded English.
+ * Strategy: look for lines where text appears between JSX tags but is NOT
+ * wrapped in a {…} expression.
+ *
+ * Pattern: >  Some Text Here   <  (with optional leading whitespace)
+ */
+const JSX_TEXT_RE = />\s*([A-Z][^<{}\n]{3,}?)\s*</g;
+
+/**
+ * Also catch string literals used directly as prop values that look like
+ * display text: title="Some English Text" (but not className, id, etc.)
+ */
+const DISPLAY_PROP_RE = /(?:title|label|placeholder|aria-label|alt)="([^"]{4,})"/g;
+
+const findings = [];
+
+for (const dir of SCAN_DIRS) {
+  for (const file of walkFiles(dir)) {
+    const rel = relative(ROOT, file).replace(/\\/g, '/');
+    const content = readFileSync(file, 'utf8');
+    const lines = content.split('\n');
+
+    for (const [lineIdx, line] of lines.entries()) {
+      // Skip comment lines
+      if (/^\s*\/\//.test(line) || /^\s*\*/.test(line)) continue;
+      // Skip lines that are already pure t() calls
+      if (/\{t\(/.test(line)) continue;
+
+      // JSX text between tags
+      let m;
+      JSX_TEXT_RE.lastIndex = 0;
+      while ((m = JSX_TEXT_RE.exec(line)) !== null) {
+        const text = m[1].trim();
+        if (!shouldSkip(text)) {
+          findings.push({ file: rel, line: lineIdx + 1, text });
+        }
+      }
+
+      // Display props with raw English strings
+      DISPLAY_PROP_RE.lastIndex = 0;
+      while ((m = DISPLAY_PROP_RE.exec(line)) !== null) {
+        const text = m[1].trim();
+        if (!shouldSkip(text)) {
+          findings.push({ file: rel, line: lineIdx + 1, text: `[prop] ${text}` });
+        }
+      }
+    }
+  }
+}
+
+if (findings.length === 0) {
+  console.log('✓ No hardcoded UI text found in shared/layout components');
+  process.exit(0);
+} else {
+  console.warn(`⚠ Found ${findings.length} potential hardcoded string(s):\n`);
+  for (const { file, line, text } of findings) {
+    console.warn(`  ${file}:${line}  →  "${text}"`);
+  }
+  // Exit 1 to allow failing CI; change to process.exit(0) to make it advisory only
+  process.exit(1);
+}
diff --git a/frontend/scripts/check-i18n-keys.mjs b/frontend/scripts/check-i18n-keys.mjs
new file mode 100644
index 0000000..c29eca1
--- /dev/null
+++ b/frontend/scripts/check-i18n-keys.mjs
@@ -0,0 +1,83 @@
+/**
+ * check-i18n-keys.mjs
+ * Scans all .ts/.tsx files in src/ and verifies every static t('key') call
+ * exists as a dot-path entry in src/i18n/en.json.
+ *
+ * Usage: node scripts/check-i18n-keys.mjs
+ * Exit code 1 if any missing keys are found.
+ */
+
+import { readFileSync, readdirSync, statSync } from 'node:fs';
+import { join, relative } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = fileURLToPath(new URL('.', import.meta.url));
+const ROOT = join(__dirname, '..');
+const SRC = join(ROOT, 'src');
+const EN_JSON = join(ROOT, 'src', 'i18n', 'en.json');
+
+// Load en.json and build a flat Set of all dot-paths
+function flattenKeys(obj, prefix = '') {
+  const keys = new Set();
+  for (const [k, v] of Object.entries(obj)) {
+    const path = prefix ? `${prefix}.${k}` : k;
+    if (v !== null && typeof v === 'object' && !Array.isArray(v)) {
+      for (const nested of flattenKeys(v, path)) keys.add(nested);
+    } else {
+      keys.add(path);
+    }
+  }
+  return keys;
+}
+
+const enJson = JSON.parse(readFileSync(EN_JSON, 'utf8'));
+const definedKeys = flattenKeys(enJson);
+
+// Collect all .ts/.tsx files under src/
+function* walkFiles(dir) {
+  for (const entry of readdirSync(dir)) {
+    const full = join(dir, entry);
+    if (statSync(full).isDirectory()) {
+      yield* walkFiles(full);
+    } else if (/\.(tsx?|jsx?)$/.test(entry) && !entry.endsWith('.d.ts')) {
+      yield full;
+    }
+  }
+}
+
+// Extract static string arguments from t('...') or t("...") calls.
+// Matches: t('key'), t("key"), t(`key`), useTranslation().t('key'),
+// as well as i18n.t('key') patterns.
+const T_CALL_RE = /\bt\(\s*(['"`])([^'"`\s]+)\1/g;
+
+const missing = [];
+
+for (const file of walkFiles(SRC)) {
+  const rel = relative(ROOT, file).replace(/\\/g, '/');
+  const content = readFileSync(file, 'utf8');
+  const lines = content.split('\n');
+
+  for (const [lineIdx, line] of lines.entries()) {
+    let match;
+    T_CALL_RE.lastIndex = 0;
+    while ((match = T_CALL_RE.exec(line)) !== null) {
+      const key = match[2];
+      // Skip dynamic keys (contain ${) or non-string patterns
+      if (key.includes('${') || key.includes('(')) continue;
+      if (!definedKeys.has(key)) {
+        missing.push({ file: rel, line: lineIdx + 1, key });
+      }
+    }
+  }
+}
+
+if (missing.length === 0) {
+  console.log('✓ All t() keys are present in en.json');
+  process.exit(0);
+} else {
+  console.error(`✗ Found ${missing.length} missing i18n key(s):\n`);
+  for (const { file, line, key } of missing) {
+    console.error(`  ${file}:${line}  →  "${key}"`);
+  }
+  process.exit(1);
+}
diff --git a/frontend/src/components/layout/Footer.tsx b/frontend/src/components/layout/Footer.tsx
index 7cef37d..9dc6e14 100644
--- a/frontend/src/components/layout/Footer.tsx
+++ b/frontend/src/components/layout/Footer.tsx
@@ -2,49 +2,64 @@ import { Link } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
 import { ArrowRight, FileText, Layers3 } from 'lucide-react';
 
-const FOOTER_TOOLS = {
+interface FooterTool {
+  slug: string;
+  i18nKey: string;
+  isLanding?: boolean;
+  isComparison?: boolean;
+}
+
+const FOOTER_TOOLS: Record<string, FooterTool[]> = {
   PDF: [
-    { slug: 'pdf-to-word', label: 'PDF to Word' },
-    { slug: 'compress-pdf', label: 'Compress PDF' },
-    { slug: 'merge-pdf', label: 'Merge PDF' },
-    { slug: 'split-pdf', label: 'Split PDF' },
-    { slug: 'pdf-to-images', label: 'PDF to Images' },
-    { slug: 'protect-pdf', label: 'Protect PDF' },
-    { slug: 'watermark-pdf', label: 'Watermark PDF' },
-    { slug: 'pdf-editor', label: 'PDF Editor' },
+    { slug: 'pdf-to-word', i18nKey: 'tools.pdfToWord.title' },
+    { slug: 'compress-pdf', i18nKey: 'tools.compressPdf.title' },
+    { slug: 'merge-pdf', i18nKey: 'tools.mergePdf.title' },
+    { slug: 'split-pdf', i18nKey: 'tools.splitPdf.title' },
+    { slug: 'pdf-to-images', i18nKey: 'tools.pdfToImages.title' },
+    { slug: 'protect-pdf', i18nKey: 'tools.protectPdf.title' },
+    { slug: 'watermark-pdf', i18nKey: 'tools.watermarkPdf.title' },
+    { slug: 'pdf-editor', i18nKey: 'tools.pdfEditor.title' },
   ],
   'Image & Convert': [
-    { slug: 'compress-image', label: 'Compress Image' },
-    { slug: 'image-converter', label: 'Image Converter' },
-    { slug: 'image-resize', label: 'Image Resize' },
-    { slug: 'remove-background', label: 'Remove Background' },
-    { slug: 'word-to-pdf', label: 'Word to PDF' },
-    { slug: 'html-to-pdf', label: 'HTML to PDF' },
-    { slug: 'pdf-to-excel', label: 'PDF to Excel' },
+    { slug: 'compress-image', i18nKey: 'tools.compressImage.title' },
+    { slug: 'image-converter', i18nKey: 'tools.imageConvert.title' },
+    { slug: 'image-resize', i18nKey: 'tools.imageResize.title' },
+    { slug: 'remove-background', i18nKey: 'tools.removeBg.title' },
+    { slug: 'word-to-pdf', i18nKey: 'tools.wordToPdf.title' },
+    { slug: 'html-to-pdf', i18nKey: 'tools.htmlToPdf.title' },
+    { slug: 'pdf-to-excel', i18nKey: 'tools.pdfToExcel.title' },
   ],
   'AI & Utility': [
-    { slug: 'chat-pdf', label: 'Chat with PDF' },
-    { slug: 'summarize-pdf', label: 'Summarize PDF' },
-    { slug: 'translate-pdf', label: 'Translate PDF' },
-    { slug: 'ocr', label: 'OCR' },
-    { slug: 'qr-code', label: 'QR Code Generator' },
-    { slug: 'video-to-gif', label: 'Video to GIF' },
-    { slug: 'word-counter', label: 'Word Counter' },
+    { slug: 'chat-pdf', i18nKey: 'tools.chatPdf.title' },
+    { slug: 'summarize-pdf', i18nKey: 'tools.summarizePdf.title' },
+    { slug: 'translate-pdf', i18nKey: 'tools.translatePdf.title' },
+    { slug: 'ocr', i18nKey: 'tools.ocr.title' },
+    { slug: 'qr-code', i18nKey: 'tools.qrCode.title' },
+    { slug: 'video-to-gif', i18nKey: 'tools.videoToGif.title' },
+    { slug: 'word-counter', i18nKey: 'tools.wordCounter.title' },
   ],
   Guides: [
-    { slug: 'best-pdf-tools', label: 'Best PDF Tools', isLanding: true },
-    { slug: 'free-pdf-tools-online', label: 'Free PDF Tools Online', isLanding: true },
-    { slug: 'convert-files-online', label: 'Convert Files Online', isLanding: true },
+    { slug: 'best-pdf-tools', i18nKey: 'footer.guides.bestPdfTools', isLanding: true },
+    { slug: 'free-pdf-tools-online', i18nKey: 'footer.guides.freePdfToolsOnline', isLanding: true },
+    { slug: 'convert-files-online', i18nKey: 'footer.guides.convertFilesOnline', isLanding: true },
   ],
   Comparisons: [
-    { slug: 'compress-pdf-vs-ilovepdf', label: 'Dociva vs iLovePDF', isComparison: true },
-    { slug: 'merge-pdf-vs-smallpdf', label: 'Dociva vs Smallpdf', isComparison: true },
-    { slug: 'pdf-to-word-vs-adobe-acrobat', label: 'Dociva vs Adobe Acrobat', isComparison: true },
-    { slug: 'compress-image-vs-tinypng', label: 'Dociva vs TinyPNG', isComparison: true },
-    { slug: 'ocr-vs-adobe-scan', label: 'Dociva vs Adobe Scan', isComparison: true },
+    { slug: 'compress-pdf-vs-ilovepdf', i18nKey: 'footer.comparisons.compressPdfVsIlovepdf', isComparison: true },
+    { slug: 'merge-pdf-vs-smallpdf', i18nKey: 'footer.comparisons.mergePdfVsSmallpdf', isComparison: true },
+    { slug: 'pdf-to-word-vs-adobe-acrobat', i18nKey: 'footer.comparisons.pdfToWordVsAdobeAcrobat', isComparison: true },
+    { slug: 'compress-image-vs-tinypng', i18nKey: 'footer.comparisons.compressImageVsTinypng', isComparison: true },
+    { slug: 'ocr-vs-adobe-scan', i18nKey: 'footer.comparisons.ocrVsAdobeScan', isComparison: true },
   ],
 };
 
+const CATEGORY_KEYS: Record<string, string> = {
+  'PDF': 'footer.categories.pdf',
+  'Image & Convert': 'footer.categories.imageConvert',
+  'AI & Utility': 'footer.categories.aiUtility',
+  'Guides': 'footer.categories.guides',
+  'Comparisons': 'footer.categories.comparisons',
+};
+
 export default function Footer() {
   const { t } = useTranslation();
 
@@ -63,16 +78,13 @@ export default function Footer() {
                     {t('common.appName')}
                   </p>
                   <p className="text-sm text-slate-500 dark:text-slate-400">
-                    {t('common.siteTagline', 'Online PDF and file workflows')}
+                    {t('common.siteTagline')}
                   </p>
                 </div>
               </div>
 
               <p className="mt-6 max-w-md text-sm leading-7 text-slate-600 dark:text-slate-300">
-                {t(
-                  'common.footerDescription',
-                  'Convert, compress, edit, and automate document work in one browser-based workspace built for speed, clarity, and secure processing.'
-                )}
+                {t('common.footerDescription')}
               </p>
 
               <div className="mt-6 flex flex-wrap gap-3">
@@ -96,16 +108,16 @@ export default function Footer() {
               {Object.entries(FOOTER_TOOLS).map(([category, tools]) => (
                 <div key={category}>
                   <h3 className="mb-4 text-xs font-bold uppercase tracking-[0.22em] text-slate-500 dark:text-slate-400">
-                    {category}
+                    {t(CATEGORY_KEYS[category] ?? category)}
                   </h3>
                   <ul className="space-y-2.5">
                     {tools.map((tool) => (
                       <li key={tool.slug}>
                         <Link
-                          to={(tool as { slug: string; isLanding?: boolean; isComparison?: boolean }).isComparison ? `/compare/${tool.slug}` : (tool as { slug: string; isLanding?: boolean }).isLanding ? `/${tool.slug}` : `/tools/${tool.slug}`}
+                          to={tool.isComparison ? `/compare/${tool.slug}` : tool.isLanding ? `/${tool.slug}` : `/tools/${tool.slug}`}
                           className="text-sm text-slate-600 transition-colors hover:text-primary-600 dark:text-slate-300 dark:hover:text-primary-400"
                         >
-                          {tool.label}
+                          {t(tool.i18nKey)}
                         </Link>
                       </li>
                     ))}
diff --git a/frontend/src/components/layout/Header.tsx b/frontend/src/components/layout/Header.tsx
index 04c2fc0..5e867a9 100644
--- a/frontend/src/components/layout/Header.tsx
+++ b/frontend/src/components/layout/Header.tsx
@@ -110,7 +110,7 @@ export default function Header() {
                 {t('common.appName')}
               </span>
               <span className="hidden text-xs font-medium text-slate-500 dark:text-slate-400 sm:block">
-                {t('common.siteTagline', 'Online PDF and file workflows')}
+                {t('common.siteTagline')}
               </span>
             </div>
           </Link>
@@ -145,7 +145,7 @@ export default function Header() {
               className="hidden items-center gap-2 rounded-full bg-slate-950 px-4 py-2.5 text-sm font-semibold text-white shadow-sm transition-all hover:-translate-y-0.5 hover:bg-primary-600 lg:inline-flex dark:bg-white dark:text-slate-950 dark:hover:bg-primary-300"
             >
               <Sparkles className="h-4 w-4" />
-              {t('home.startFree', 'Start Free')}
+              {t('home.startFree')}
               <ArrowRight className="h-3.5 w-3.5" />
             </Link>
           ) : null}
diff --git a/frontend/src/components/shared/ErrorBoundary.tsx b/frontend/src/components/shared/ErrorBoundary.tsx
index 73d88f1..3227a46 100644
--- a/frontend/src/components/shared/ErrorBoundary.tsx
+++ b/frontend/src/components/shared/ErrorBoundary.tsx
@@ -1,7 +1,8 @@
 import { Component, type ReactNode } from 'react';
 import { AlertTriangle } from 'lucide-react';
+import { withTranslation, type WithTranslation } from 'react-i18next';
 
-interface Props {
+interface Props extends WithTranslation {
   children: ReactNode;
   fallbackMessage?: string;
 }
@@ -10,7 +11,7 @@ interface State {
   hasError: boolean;
 }
 
-export default class ErrorBoundary extends Component<Props, State> {
+class ErrorBoundary extends Component<Props, State> {
   state: State = { hasError: false };
 
   static getDerivedStateFromError(): State {
@@ -22,6 +23,7 @@ export default class ErrorBoundary extends Component<Props, State> {
   };
 
   render() {
+    const { t } = this.props;
     if (this.state.hasError) {
       return (
         <div className="mx-auto max-w-lg py-16 text-center">
@@ -29,16 +31,16 @@ export default class ErrorBoundary extends Component<Props, State> {
             <AlertTriangle className="h-8 w-8 text-red-600 dark:text-red-400" />
           </div>
           <h2 className="mb-2 text-xl font-semibold text-slate-800 dark:text-slate-200">
-            {this.props.fallbackMessage || 'Something went wrong'}
+            {this.props.fallbackMessage || t('common.errors.genericTitle')}
           </h2>
           <p className="mb-6 text-sm text-slate-500 dark:text-slate-400">
-            An unexpected error occurred. Please try again.
+            {t('common.errors.genericDesc')}
           </p>
           <button
             onClick={this.handleReset}
             className="rounded-lg bg-primary-600 px-6 py-2 text-sm font-medium text-white hover:bg-primary-700 transition-colors"
           >
-            Try Again
+            {t('common.errors.tryAgain')}
           </button>
         </div>
       );
@@ -46,3 +48,5 @@ export default class ErrorBoundary extends Component<Props, State> {
     return this.props.children;
   }
 }
+
+export default withTranslation()(ErrorBoundary);
diff --git a/frontend/src/components/shared/ToolTemplate.tsx b/frontend/src/components/shared/ToolTemplate.tsx
index 270addf..6941f82 100644
--- a/frontend/src/components/shared/ToolTemplate.tsx
+++ b/frontend/src/components/shared/ToolTemplate.tsx
@@ -172,10 +172,10 @@ export default function ToolTemplate({ config, onGetExtraData, children }: ToolT
                 {isUploading ? (
                   <>
                     <Clock className="h-5 w-5 animate-spin" />
-                    {t('common.uploading', { defaultValue: 'Uploading...' })}
+                    {t('common.uploading')}
                   </>
                 ) : (
-                  t('common.convert', { defaultValue: 'Convert' })
+                  t('common.convert')
                 )}
               </button>
             </div>
@@ -195,8 +195,8 @@ export default function ToolTemplate({ config, onGetExtraData, children }: ToolT
                     <div className="flex items-center gap-3">
                       <CheckCircle className="h-6 w-6 text-green-600 dark:text-green-400" />
                       <div>
-                        <h2 className="font-semibold text-green-900 dark:text-green-200">Success!</h2>
-                        <p className="text-sm text-green-700 dark:text-green-300">Your file is ready</p>
+                      <h2 className="font-semibold text-green-900 dark:text-green-200">{t('result.success')}</h2>
+                      <p className="text-sm text-green-700 dark:text-green-300">{t('result.fileReady')}</p>
                       </div>
                     </div>
                   </div>
@@ -208,15 +208,15 @@ export default function ToolTemplate({ config, onGetExtraData, children }: ToolT
                   <div className="flex items-center gap-3">
                     <AlertCircle className="h-6 w-6 text-red-600 dark:text-red-400" />
                     <div>
-                      <h2 className="font-semibold text-red-900 dark:text-red-200">Error</h2>
-                      <p className="text-sm text-red-700 dark:text-red-300">{error || 'Processing failed'}</p>
+                      <h2 className="font-semibold text-red-900 dark:text-red-200">{t('common.error')}</h2>
+                      <p className="text-sm text-red-700 dark:text-red-300">{error || t('common.errors.processingFailed')}</p>
                     </div>
                   </div>
                 </div>
               )}
 
               <button onClick={handleReset} className="btn-secondary w-full">
-                Process Another
+                {t('result.processAnother')}
               </button>
             </div>
           )}
diff --git a/frontend/src/components/tools/BarcodeGenerator.tsx b/frontend/src/components/tools/BarcodeGenerator.tsx
index b34d2cc..37d3ca7 100644
--- a/frontend/src/components/tools/BarcodeGenerator.tsx
+++ b/frontend/src/components/tools/BarcodeGenerator.tsx
@@ -98,7 +98,7 @@ export default function BarcodeGenerator() {
         {phase === 'done' && downloadUrl && (
           <div className="space-y-4 text-center">
             <div className="rounded-2xl bg-white p-6 ring-1 ring-slate-200 dark:bg-slate-800 dark:ring-slate-700">
-              <img src={downloadUrl} alt="Barcode" loading="lazy" decoding="async" className="mx-auto max-w-full" width="300" height="100" style={{aspectRatio:'3/1'}} />
+              <img src={downloadUrl} alt={t('tools.barcode.altText')} loading="lazy" decoding="async" className="mx-auto max-w-full" width="300" height="100" style={{aspectRatio:'3/1'}} />
             </div>
             <div className="flex gap-3">
               <a href={downloadUrl} download className="btn-primary flex-1">{t('common.download')}</a>
diff --git a/frontend/src/components/tools/ImageResize.tsx b/frontend/src/components/tools/ImageResize.tsx
index 0402b61..04e8c97 100644
--- a/frontend/src/components/tools/ImageResize.tsx
+++ b/frontend/src/components/tools/ImageResize.tsx
@@ -143,7 +143,7 @@ export default function ImageResize() {
                         type="number"
                         min="1"
                         max="10000"
-                        placeholder="e.g. 800"
+                        placeholder={t('tools.imageResize.widthPlaceholder')}
                         value={width}
                         onChange={(e) => {
                           setWidth(e.target.value);
@@ -160,7 +160,7 @@ export default function ImageResize() {
                         type="number"
                         min="1"
                         max="10000"
-                        placeholder="e.g. 600"
+                        placeholder={t('tools.imageResize.heightPlaceholder')}
                         value={height}
                         onChange={(e) => {
                           setHeight(e.target.value);
diff --git a/frontend/src/components/tools/QrCodeGenerator.tsx b/frontend/src/components/tools/QrCodeGenerator.tsx
index 8336301..961b0c6 100644
--- a/frontend/src/components/tools/QrCodeGenerator.tsx
+++ b/frontend/src/components/tools/QrCodeGenerator.tsx
@@ -113,7 +113,7 @@ export default function QrCodeGenerator() {
         {phase === 'done' && result && result.status === 'completed' && downloadUrl && (
           <div className="space-y-6 text-center">
             <div className="rounded-2xl bg-white p-8 ring-1 ring-slate-200 dark:bg-slate-800 dark:ring-slate-700">
-              <img src={downloadUrl} alt="QR Code" loading="lazy" decoding="async" className="mx-auto max-w-[300px] rounded-lg" width={size} height={size} style={{aspectRatio:'1/1'}} />
+              <img src={downloadUrl} alt={t('tools.qrCode.altText')} loading="lazy" decoding="async" className="mx-auto max-w-[300px] rounded-lg" width={size} height={size} style={{aspectRatio:'1/1'}} />
             </div>
             <div className="flex gap-3">
               <a href={downloadUrl} download={result.filename || 'qrcode.png'}
diff --git a/frontend/src/i18n/ar.json b/frontend/src/i18n/ar.json
index b4dae81..372549f 100644
--- a/frontend/src/i18n/ar.json
+++ b/frontend/src/i18n/ar.json
@@ -1,4 +1,4 @@
-{
+{
   "common": {
     "appName": "Dociva",
     "tagline": "أدوات ملفات مجانية على الإنترنت",
@@ -35,6 +35,11 @@
     "subject": "الموضوع",
     "message": "الرسالة",
     "name": "الاسم",
+    "siteTagline": "سير عمل PDF والملفات عبر الإنترنت",
+    "footerDescription": "حوّل، اضغط، عدّل، وأتمت عمل المستندات في مساحة عمل واحدة تعمل في المتصفح، مصممة للسرعة والوضوح والمعالجة الآمنة.",
+    "uploading": "جارٍ الرفع...",
+    "convert": "تحويل",
+    "sending": "جارٍ الإرسال...",
     "errors": {
       "fileTooLarge": "حجم الملف كبير جدًا. الحد الأقصى المسموح {{size}} ميجابايت.",
       "invalidFileType": "نوع الملف غير صالح. الأنواع المقبولة: {{types}}",
@@ -44,7 +49,19 @@
       "rateLimited": "طلبات كثيرة جدًا. يرجى الانتظار لحظة والمحاولة مجددًا.",
       "serverError": "حدث خطأ في الخادم. يرجى المحاولة لاحقًا.",
       "networkError": "خطأ في الشبكة. يرجى التحقق من اتصالك والمحاولة مرة أخرى.",
-      "noFileSelected": "لم يتم اختيار ملف. يرجى اختيار ملف للرفع."
+      "noFileSelected": "لم يتم اختيار ملف. يرجى اختيار ملف للرفع.",
+      "aiUnavailable": "ميزات الذكاء الاصطناعي غير متاحة مؤقتاً. يرجى المحاولة لاحقاً.",
+      "aiRateLimited": "خدمة الذكاء الاصطناعي مشغولة حالياً. يرجى المحاولة بعد قليل.",
+      "aiBudgetExceeded": "تم استنفاد حصة معالجة الذكاء الاصطناعي. يرجى المحاولة لاحقاً.",
+      "pdfEncrypted": "هذا الـ PDF محمي بكلمة مرور. يرجى إلغاء قفله أولاً.",
+      "pdfTextEmpty": "لم يُعثر على نص قابل للقراءة في هذا الـ PDF.",
+      "pdfNoTables": "لم تُعثر على جداول في هذا الـ PDF.",
+      "taskUnavailable": "الخدمة غير متاحة مؤقتاً. يرجى إعادة المحاولة بعد لحظة.",
+      "translationFailed": "فشلت خدمة الترجمة. يرجى المحاولة مرة أخرى.",
+      "invalidInput": "مدخلات غير صالحة. يرجى التحقق من إعداداتك والمحاولة مرة أخرى.",
+      "genericTitle": "حدث خطأ ما",
+      "genericDesc": "حدث خطأ غير متوقع. يرجى المحاولة مرة أخرى.",
+      "tryAgain": "حاول مرة أخرى"
     }
   },
   "auth": {
@@ -141,7 +158,31 @@
     "feature2Title": "دقة يمكنك الوثوق بها",
     "feature2Desc": "احصل على ملفات دقيقة وقابلة للتعديل في ثوانٍ بدون فقدان للجودة.",
     "feature3Title": "أمان مدمج",
-    "feature3Desc": "قم بالوصول إلى ملفاتك بأمان، محمية بتشفير تلقائي."
+    "feature3Desc": "قم بالوصول إلى ملفاتك بأمان، محمية بتشفير تلقائي.",
+    "startFree": "ابدأ مجاناً",
+    "heroBadge": "سير عمل مستندات حديثة",
+    "statsToolsLabel": "إجمالي الأدوات",
+    "statsPdfLabel": "سير عمل PDF",
+    "statsOtherLabel": "الصور والذكاء الاصطناعي والأدوات",
+    "statsAccessLabel": "نموذج الوصول",
+    "statsAccessValue": "بدون تسجيل",
+    "trustSecure": "حذف تلقائي للملفات",
+    "trustFast": "نتائج في ثوانٍ",
+    "trust30Tools": "أكثر من 30 أداة مجانية",
+    "trustNoSignup": "لا حاجة للتسجيل",
+    "ctaBrowseTools": "تصفح كل الأدوات",
+    "quickStartLabel": "نقاط انطلاق شائعة",
+    "heroUploadEyebrow": "ارفع وابدأ",
+    "heroUploadTitle": "اختر ملفاً وانطلق مباشرة إلى الأداة المناسبة",
+    "howItWorksLabel": "عملية بسيطة",
+    "howItWorksTitle": "حوّل وعدّل في ثلاث خطوات بسيطة",
+    "toolsDirectoryTitle": "اعثر على الأداة المناسبة بسرعة أكبر",
+    "otherTools": "أدوات أخرى",
+    "whyChooseLabel": "لماذا Dociva",
+    "ctaBannerLabel": "ابدأ اليوم",
+    "ctaBannerTitle": "هل أنت مستعد لتحويل ملفاتك؟",
+    "ctaBannerSubtitle": "انضم إلى آلاف المستخدمين الذين يحوّلون ويضغطون ويعدّلون ملفاتهم يومياً — مجاناً تماماً.",
+    "ctaCreateAccount": "إنشاء حساب مجاني"
   },
   "socialProof": {
     "badge": "موثوق من فرق نشطة",
@@ -173,7 +214,11 @@
         "أدوات المستندات بالذكاء الاصطناعي — التحدث مع PDF، التلخيص، الترجمة، استخراج الجداول",
         "OCR — استخراج النص من الصور وملفات PDF الممسوحة ضوئياً بالعربية والإنجليزية والفرنسية",
         "أدوات مساعدة — مولد QR، تحويل فيديو إلى GIF، عداد الكلمات، منظف النصوص"
-      ]
+      ],
+      "heroTitle": "تمكين إنتاجية المستندات في كل مكان",
+      "teamTitle": "فريقنا",
+      "valuesTitle": "قيمنا",
+      "ctaText": "هل لديك أسئلة؟ تواصل معنا."
     },
     "contact": {
       "metaDescription": "تواصل مع فريق Dociva. أبلغ عن خطأ أو اطلب ميزة جديدة أو أرسل لنا رسالة.",
@@ -194,7 +239,12 @@
       "subjectPlaceholder": "الموضوع",
       "successMessage": "تم إرسال رسالتك! سنرد عليك قريباً.",
       "directEmail": "أو راسلنا مباشرة على",
-      "responseTime": "نرد عادةً خلال 24-48 ساعة."
+      "responseTime": "نرد عادةً خلال 24-48 ساعة.",
+      "emailLabel": "البريد الإلكتروني:",
+      "phoneLabel": "الهاتف:",
+      "officeLabel": "المكتب:",
+      "connectTitle": "تواصل معنا",
+      "faqTitle": "الأسئلة الشائعة"
     },
     "privacy": {
       "metaDescription": "سياسة الخصوصية لـ Dociva. تعرّف على كيفية تعاملنا مع ملفاتك وبياناتك بشفافية كاملة.",
@@ -643,7 +693,9 @@
       "height": "الارتفاع (بكسل)",
       "quality": "الجودة",
       "lockAspect": "قفل نسبة العرض للارتفاع",
-      "aspectHint": "أدخل بُعداً واحداً — سيتم حساب الآخر تلقائياً للحفاظ على نسبة العرض للارتفاع."
+      "aspectHint": "أدخل بُعداً واحداً — سيتم حساب الآخر تلقائياً للحفاظ على نسبة العرض للارتفاع.",
+      "widthPlaceholder": "مثال: 800",
+      "heightPlaceholder": "مثال: 600"
     },
     "imageToSvg": {
       "title": "تحويل الصورة إلى SVG",
@@ -989,7 +1041,8 @@
       "shortDesc": "إنشاء رمز QR",
       "dataLabel": "نص أو رابط",
       "dataPlaceholder": "أدخل نصاً أو رابطاً أو أي بيانات...",
-      "sizeLabel": "الحجم"
+      "sizeLabel": "الحجم",
+      "altText": "رمز QR المُولَّد"
     },
     "htmlToPdf": {
       "title": "HTML إلى PDF",
@@ -1124,7 +1177,29 @@
       "dataLabel": "بيانات الباركود",
       "dataPlaceholder": "أدخل البيانات للترميز...",
       "typeLabel": "نوع الباركود",
-      "formatLabel": "تنسيق الإخراج"
+      "formatLabel": "تنسيق الإخراج",
+      "altText": "باركود مُنشأ"
+    }
+  },
+  "footer": {
+    "categories": {
+      "pdf": "PDF",
+      "imageConvert": "الصور والتحويل",
+      "aiUtility": "الذكاء الاصطناعي والأدوات",
+      "guides": "الأدلة",
+      "comparisons": "المقارنات"
+    },
+    "guides": {
+      "bestPdfTools": "أفضل أدوات PDF",
+      "freePdfToolsOnline": "أدوات PDF مجانية عبر الإنترنت",
+      "convertFilesOnline": "تحويل الملفات عبر الإنترنت"
+    },
+    "comparisons": {
+      "compressPdfVsIlovepdf": "Dociva مقابل iLovePDF",
+      "mergePdfVsSmallpdf": "Dociva مقابل Smallpdf",
+      "pdfToWordVsAdobeAcrobat": "Dociva مقابل Adobe Acrobat",
+      "compressImageVsTinypng": "Dociva مقابل TinyPNG",
+      "ocrVsAdobeScan": "Dociva مقابل Adobe Scan"
     }
   },
   "account": {
@@ -1208,7 +1283,10 @@
     "newSize": "الحجم الجديد",
     "reduction": "نسبة التقليل",
     "downloadReady": "ملفك جاهز للتحميل.",
-    "linkExpiry": "رابط التحميل ينتهي خلال 30 دقيقة."
+    "linkExpiry": "رابط التحميل ينتهي خلال 30 دقيقة.",
+    "success": "تم بنجاح!",
+    "fileReady": "ملفك جاهز",
+    "processAnother": "معالجة ملف آخر"
   },
   "downloadGate": {
     "title": "سجّل لتحميل ملفك",
diff --git a/frontend/src/i18n/en.json b/frontend/src/i18n/en.json
index 1e65524..d8f3207 100644
--- a/frontend/src/i18n/en.json
+++ b/frontend/src/i18n/en.json
@@ -1,4 +1,4 @@
-{
+{
   "common": {
     "appName": "Dociva",
     "tagline": "Free Online File Tools",
@@ -35,6 +35,11 @@
     "subject": "Subject",
     "message": "Message",
     "name": "Name",
+    "siteTagline": "Online PDF and file workflows",
+    "footerDescription": "Convert, compress, edit, and automate document work in one browser-based workspace built for speed, clarity, and secure processing.",
+    "uploading": "Uploading...",
+    "convert": "Convert",
+    "sending": "Sending...",
     "errors": {
       "fileTooLarge": "File is too large. Maximum size is {{size}}MB.",
       "invalidFileType": "Invalid file type. Accepted: {{types}}",
@@ -44,7 +49,19 @@
       "rateLimited": "Too many requests. Please wait a moment and try again.",
       "serverError": "A server error occurred. Please try again later.",
       "networkError": "Network error. Please check your connection and try again.",
-      "noFileSelected": "No file selected. Please choose a file to upload."
+      "noFileSelected": "No file selected. Please choose a file to upload.",
+      "aiUnavailable": "AI features are temporarily unavailable. Please try again later.",
+      "aiRateLimited": "AI service is currently busy. Please try again shortly.",
+      "aiBudgetExceeded": "AI processing quota exceeded. Please try again later.",
+      "pdfEncrypted": "This PDF is password-protected. Please unlock it first.",
+      "pdfTextEmpty": "No readable text found in this PDF.",
+      "pdfNoTables": "No tables found in this PDF.",
+      "taskUnavailable": "Service temporarily unavailable. Please retry in a moment.",
+      "translationFailed": "Translation service failed. Please try again.",
+      "invalidInput": "Invalid input. Please check your settings and try again.",
+      "genericTitle": "Something went wrong",
+      "genericDesc": "An unexpected error occurred. Please try again.",
+      "tryAgain": "Try Again"
     }
   },
   "auth": {
@@ -141,7 +158,31 @@
     "feature2Title": "Accuracy you can trust",
     "feature2Desc": "Get pixel-perfect, editable files in seconds with zero quality loss.",
     "feature3Title": "Built-in security",
-    "feature3Desc": "Access files securely, protected by automatic encryption."
+    "feature3Desc": "Access files securely, protected by automatic encryption.",
+    "startFree": "Start Free",
+    "heroBadge": "Modern document workflows",
+    "statsToolsLabel": "Total tools",
+    "statsPdfLabel": "PDF workflows",
+    "statsOtherLabel": "Image, AI & utility",
+    "statsAccessLabel": "Access model",
+    "statsAccessValue": "No signup",
+    "trustSecure": "Files auto-deleted",
+    "trustFast": "Results in seconds",
+    "trust30Tools": "30+ free tools",
+    "trustNoSignup": "No sign-up needed",
+    "ctaBrowseTools": "Browse All Tools",
+    "quickStartLabel": "Popular starting points",
+    "heroUploadEyebrow": "Upload and start",
+    "heroUploadTitle": "Choose a file and jump straight into the right tool",
+    "howItWorksLabel": "Simple process",
+    "howItWorksTitle": "Convert and edit in three simple steps",
+    "toolsDirectoryTitle": "Find the right tool faster",
+    "otherTools": "Other Tools",
+    "whyChooseLabel": "Why Dociva",
+    "ctaBannerLabel": "Get started today",
+    "ctaBannerTitle": "Ready to convert your files?",
+    "ctaBannerSubtitle": "Join thousands of users who convert, compress, and edit their files every day — completely free.",
+    "ctaCreateAccount": "Create Free Account"
   },
   "socialProof": {
     "badge": "Trusted by active teams",
@@ -173,7 +214,11 @@
         "AI document tools — chat with PDFs, summarize, translate, extract tables",
         "OCR — extract text from images and scanned PDFs in English, Arabic, and French",
         "Utility tools — QR code generator, video to GIF, word counter, text cleaner"
-      ]
+      ],
+      "heroTitle": "Empowering Document Productivity Worldwide",
+      "teamTitle": "Our Team",
+      "valuesTitle": "Our Values",
+      "ctaText": "Have questions? Get in touch."
     },
     "contact": {
       "metaDescription": "Contact the Dociva team. Report bugs, request features, or send us a message.",
@@ -194,7 +239,12 @@
       "subjectPlaceholder": "Subject",
       "successMessage": "Your message has been sent! We'll get back to you soon.",
       "directEmail": "Or email us directly at",
-      "responseTime": "We typically respond within 24–48 hours."
+      "responseTime": "We typically respond within 24–48 hours.",
+      "emailLabel": "Email:",
+      "phoneLabel": "Phone:",
+      "officeLabel": "Office:",
+      "connectTitle": "Connect With Us",
+      "faqTitle": "FAQ"
     },
     "privacy": {
       "metaDescription": "Privacy policy for Dociva. Learn how we handle your files and data with full transparency.",
@@ -643,7 +693,9 @@
       "height": "Height (px)",
       "quality": "Quality",
       "lockAspect": "Lock aspect ratio",
-      "aspectHint": "Enter one dimension — the other will auto-calculate to preserve aspect ratio."
+      "aspectHint": "Enter one dimension — the other will auto-calculate to preserve aspect ratio.",
+      "widthPlaceholder": "e.g. 800",
+      "heightPlaceholder": "e.g. 600"
     },
     "imageToSvg": {
       "title": "Image to SVG",
@@ -989,7 +1041,8 @@
       "shortDesc": "Generate QR Code",
       "dataLabel": "Text or URL",
       "dataPlaceholder": "Enter text, URL, or any data...",
-      "sizeLabel": "Size"
+      "sizeLabel": "Size",
+      "altText": "Generated QR Code"
     },
     "htmlToPdf": {
       "title": "HTML to PDF",
@@ -1124,7 +1177,29 @@
       "dataLabel": "Barcode Data",
       "dataPlaceholder": "Enter data to encode...",
       "typeLabel": "Barcode Type",
-      "formatLabel": "Output Format"
+      "formatLabel": "Output Format",
+      "altText": "Generated barcode"
+    }
+  },
+  "footer": {
+    "categories": {
+      "pdf": "PDF",
+      "imageConvert": "Image & Convert",
+      "aiUtility": "AI & Utility",
+      "guides": "Guides",
+      "comparisons": "Comparisons"
+    },
+    "guides": {
+      "bestPdfTools": "Best PDF Tools",
+      "freePdfToolsOnline": "Free PDF Tools Online",
+      "convertFilesOnline": "Convert Files Online"
+    },
+    "comparisons": {
+      "compressPdfVsIlovepdf": "Dociva vs iLovePDF",
+      "mergePdfVsSmallpdf": "Dociva vs Smallpdf",
+      "pdfToWordVsAdobeAcrobat": "Dociva vs Adobe Acrobat",
+      "compressImageVsTinypng": "Dociva vs TinyPNG",
+      "ocrVsAdobeScan": "Dociva vs Adobe Scan"
     }
   },
   "account": {
@@ -1208,7 +1283,10 @@
     "newSize": "New Size",
     "reduction": "Reduction",
     "downloadReady": "Your file is ready for download.",
-    "linkExpiry": "Download link expires in 30 minutes."
+    "linkExpiry": "Download link expires in 30 minutes.",
+    "success": "Success!",
+    "fileReady": "Your file is ready",
+    "processAnother": "Process Another"
   },
   "downloadGate": {
     "title": "Sign up to download your file",
diff --git a/frontend/src/i18n/fr.json b/frontend/src/i18n/fr.json
index ee97e82..8ea2593 100644
--- a/frontend/src/i18n/fr.json
+++ b/frontend/src/i18n/fr.json
@@ -1,4 +1,4 @@
-{
+{
   "common": {
     "appName": "Dociva",
     "tagline": "Outils de fichiers en ligne gratuits",
@@ -35,6 +35,11 @@
     "subject": "Sujet",
     "message": "Message",
     "name": "Nom",
+    "siteTagline": "Workflows PDF et fichiers en ligne",
+    "footerDescription": "Convertissez, compressez, modifiez et automatisez le traitement de documents dans un espace de travail basé sur le navigateur, conçu pour la rapidité, la clarté et le traitement sécurisé.",
+    "uploading": "Téléchargement en cours...",
+    "convert": "Convertir",
+    "sending": "Envoi en cours...",
     "errors": {
       "fileTooLarge": "Fichier trop volumineux. Taille maximale autorisée : {{size}} Mo.",
       "invalidFileType": "Type de fichier non valide. Formats acceptés : {{types}}",
@@ -44,7 +49,19 @@
       "rateLimited": "Trop de requêtes. Veuillez attendre un moment et réessayer.",
       "serverError": "Une erreur serveur s'est produite. Veuillez réessayer plus tard.",
       "networkError": "Erreur réseau. Veuillez vérifier votre connexion et réessayer.",
-      "noFileSelected": "Aucun fichier sélectionné. Veuillez choisir un fichier à télécharger."
+      "noFileSelected": "Aucun fichier sélectionné. Veuillez choisir un fichier à télécharger.",
+      "aiUnavailable": "Les fonctionnalités IA sont temporairement indisponibles. Veuillez réessayer plus tard.",
+      "aiRateLimited": "Le service IA est actuellement occupé. Veuillez réessayer dans un instant.",
+      "aiBudgetExceeded": "Quota de traitement IA dépassé. Veuillez réessayer plus tard.",
+      "pdfEncrypted": "Ce PDF est protégé par un mot de passe. Veuillez d'abord le déverrouiller.",
+      "pdfTextEmpty": "Aucun texte lisible trouvé dans ce PDF.",
+      "pdfNoTables": "Aucun tableau trouvé dans ce PDF.",
+      "taskUnavailable": "Service temporairement indisponible. Veuillez réessayer dans un instant.",
+      "translationFailed": "Le service de traduction a échoué. Veuillez réessayer.",
+      "invalidInput": "Entrée non valide. Veuillez vérifier vos paramètres et réessayer.",
+      "genericTitle": "Une erreur s'est produite",
+      "genericDesc": "Une erreur inattendue s'est produite. Veuillez réessayer.",
+      "tryAgain": "Réessayer"
     }
   },
   "auth": {
@@ -141,7 +158,31 @@
     "feature2Title": "Une précision de confiance",
     "feature2Desc": "Obtenez des fichiers parfaits et modifiables en quelques secondes sans perte de qualité.",
     "feature3Title": "Sécurité intégrée",
-    "feature3Desc": "Accédez aux fichiers en toute sécurité, protégés par un cryptage automatique."
+    "feature3Desc": "Accédez aux fichiers en toute sécurité, protégés par un cryptage automatique.",
+    "startFree": "Commencer gratuitement",
+    "heroBadge": "Workflows de documents modernes",
+    "statsToolsLabel": "Total des outils",
+    "statsPdfLabel": "Workflows PDF",
+    "statsOtherLabel": "Image, IA et utilitaires",
+    "statsAccessLabel": "Modèle d'accès",
+    "statsAccessValue": "Sans inscription",
+    "trustSecure": "Fichiers supprimés automatiquement",
+    "trustFast": "Résultats en quelques secondes",
+    "trust30Tools": "30+ outils gratuits",
+    "trustNoSignup": "Aucune inscription requise",
+    "ctaBrowseTools": "Parcourir tous les outils",
+    "quickStartLabel": "Points de départ populaires",
+    "heroUploadEyebrow": "Déposez et commencez",
+    "heroUploadTitle": "Choisissez un fichier et accédez directement au bon outil",
+    "howItWorksLabel": "Processus simple",
+    "howItWorksTitle": "Convertissez et modifiez en trois étapes simples",
+    "toolsDirectoryTitle": "Trouvez le bon outil plus rapidement",
+    "otherTools": "Autres outils",
+    "whyChooseLabel": "Pourquoi Dociva",
+    "ctaBannerLabel": "Commencez dès aujourd'hui",
+    "ctaBannerTitle": "Prêt à convertir vos fichiers ?",
+    "ctaBannerSubtitle": "Rejoignez des milliers d'utilisateurs qui convertissent, compressent et modifient leurs fichiers chaque jour — complètement gratuit.",
+    "ctaCreateAccount": "Créer un compte gratuit"
   },
   "socialProof": {
     "badge": "Adopté par des équipes actives",
@@ -173,7 +214,11 @@
         "Outils documentaires IA — discuter avec des PDF, résumer, traduire, extraire des tableaux",
         "OCR — extraire du texte d'images et de PDF numérisés en anglais, arabe et français",
         "Outils utilitaires — générateur de QR code, vidéo vers GIF, compteur de mots, nettoyeur de texte"
-      ]
+      ],
+      "heroTitle": "Améliorer la productivité documentaire dans le monde entier",
+      "teamTitle": "Notre équipe",
+      "valuesTitle": "Nos valeurs",
+      "ctaText": "Des questions ? Contactez-nous."
     },
     "contact": {
       "metaDescription": "Contactez l'équipe Dociva. Signalez un bug, demandez une fonctionnalité ou envoyez-nous un message.",
@@ -194,7 +239,12 @@
       "subjectPlaceholder": "Sujet",
       "successMessage": "Votre message a été envoyé ! Nous vous répondrons bientôt.",
       "directEmail": "Ou contactez-nous directement à",
-      "responseTime": "Nous répondons généralement sous 24 à 48 heures."
+      "responseTime": "Nous répondons généralement sous 24 à 48 heures.",
+      "emailLabel": "E-mail :",
+      "phoneLabel": "Téléphone :",
+      "officeLabel": "Bureau :",
+      "connectTitle": "Connectez-vous avec nous",
+      "faqTitle": "FAQ"
     },
     "privacy": {
       "metaDescription": "Politique de confidentialité de Dociva. Découvrez comment nous gérons vos fichiers et données en toute transparence.",
@@ -643,7 +693,9 @@
       "height": "Hauteur (px)",
       "quality": "Qualité",
       "lockAspect": "Verrouiller le rapport d'aspect",
-      "aspectHint": "Entrez une dimension — l'autre sera calculée automatiquement pour préserver le rapport d'aspect."
+      "aspectHint": "Entrez une dimension — l'autre sera calculée automatiquement pour préserver le rapport d'aspect.",
+      "widthPlaceholder": "ex. 800",
+      "heightPlaceholder": "ex. 600"
     },
     "imageToSvg": {
       "title": "Image vers SVG",
@@ -989,7 +1041,8 @@
       "shortDesc": "Générer un code QR",
       "dataLabel": "Texte ou URL",
       "dataPlaceholder": "Entrez du texte, une URL ou des données...",
-      "sizeLabel": "Taille"
+      "sizeLabel": "Taille",
+      "altText": "QR Code généré"
     },
     "htmlToPdf": {
       "title": "HTML vers PDF",
@@ -1124,7 +1177,29 @@
       "dataLabel": "Données du code-barres",
       "dataPlaceholder": "Entrez les données à encoder...",
       "typeLabel": "Type de code-barres",
-      "formatLabel": "Format de sortie"
+      "formatLabel": "Format de sortie",
+      "altText": "Code-barres généré"
+    }
+  },
+  "footer": {
+    "categories": {
+      "pdf": "PDF",
+      "imageConvert": "Image & Conversion",
+      "aiUtility": "IA & Utilitaires",
+      "guides": "Guides",
+      "comparisons": "Comparaisons"
+    },
+    "guides": {
+      "bestPdfTools": "Meilleurs outils PDF",
+      "freePdfToolsOnline": "Outils PDF gratuits en ligne",
+      "convertFilesOnline": "Convertir des fichiers en ligne"
+    },
+    "comparisons": {
+      "compressPdfVsIlovepdf": "Dociva vs iLovePDF",
+      "mergePdfVsSmallpdf": "Dociva vs Smallpdf",
+      "pdfToWordVsAdobeAcrobat": "Dociva vs Adobe Acrobat",
+      "compressImageVsTinypng": "Dociva vs TinyPNG",
+      "ocrVsAdobeScan": "Dociva vs Adobe Scan"
     }
   },
   "account": {
@@ -1208,7 +1283,10 @@
     "newSize": "Nouvelle taille",
     "reduction": "Réduction",
     "downloadReady": "Votre fichier est prêt à être téléchargé.",
-    "linkExpiry": "Le lien de téléchargement expire dans 30 minutes."
+    "linkExpiry": "Le lien de téléchargement expire dans 30 minutes.",
+    "success": "Succès !",
+    "fileReady": "Votre fichier est prêt",
+    "processAnother": "Traiter un autre fichier"
   },
   "downloadGate": {
     "title": "Inscrivez-vous pour télécharger votre fichier",
diff --git a/frontend/src/services/api.ts b/frontend/src/services/api.ts
index bb1c3ff..6db1c52 100644
--- a/frontend/src/services/api.ts
+++ b/frontend/src/services/api.ts
@@ -1,4 +1,5 @@
 import axios, { type InternalAxiosRequestConfig } from 'axios';
+import i18n from '@/i18n';
 
 const CSRF_COOKIE_NAME = 'csrf_token';
 const CSRF_HEADER_NAME = 'X-CSRF-Token';
@@ -160,21 +161,27 @@ api.interceptors.response.use(
       }
 
       if (error.response.status === 429) {
-        return Promise.reject(new Error('Too many requests. Please wait a moment and try again.'));
+        return Promise.reject(new Error(i18n.t('common.errors.rateLimited')));
       }
 
       const responseData = error.response.data;
+      const errorCode: string | undefined = responseData?.error_code;
+      if (errorCode) {
+        const mapped = resolveErrorCode(errorCode);
+        if (mapped) return Promise.reject(new Error(mapped));
+      }
       const message =
+        responseData?.user_message ||
         responseData?.error ||
         responseData?.message ||
         (typeof responseData === 'string' && responseData.trim()
           ? responseData.replace(/<[^>]*>/g, ' ').replace(/\s+/g, ' ').trim()
           : null) ||
-        `Request failed (${error.response.status}).`;
+        i18n.t('common.errors.serverError');
       return Promise.reject(new Error(message));
     }
     if (error.request) {
-      return Promise.reject(new Error('Network error. Please check your connection.'));
+      return Promise.reject(new Error(i18n.t('common.errors.networkError')));
     }
     return Promise.reject(error);
   }
@@ -251,7 +258,57 @@ function isTaskErrorPayload(value: unknown): value is TaskErrorPayload {
   return Boolean(value) && typeof value === 'object';
 }
 
+/**
+ * Maps a backend error_code to a fully translated message via i18n.
+ * Returns null when no specific mapping exists (caller should fall back to user_message or generic).
+ */
+export function resolveErrorCode(errorCode: string): string | null {
+  const map: Record<string, string> = {
+    TASK_FAILURE: i18n.t('common.errors.processingFailed'),
+    CELERY_NOT_REGISTERED: i18n.t('common.errors.taskUnavailable'),
+    OPENROUTER_UNAUTHORIZED: i18n.t('common.errors.aiUnavailable'),
+    OPENROUTER_RATE_LIMIT: i18n.t('common.errors.aiRateLimited'),
+    OPENROUTER_INSUFFICIENT_CREDITS: i18n.t('common.errors.aiRateLimited'),
+    OPENROUTER_SERVER_ERROR: i18n.t('common.errors.serverError'),
+    OPENROUTER_CONNECTION_ERROR: i18n.t('common.errors.networkError'),
+    OPENROUTER_TIMEOUT: i18n.t('common.errors.serverError'),
+    OPENROUTER_MISSING_API_KEY: i18n.t('common.errors.aiUnavailable'),
+    OPENROUTER_EMPTY_RESPONSE: i18n.t('common.errors.aiUnavailable'),
+    OPENROUTER_ERROR_PAYLOAD: i18n.t('common.errors.aiUnavailable'),
+    OPENROUTER_REQUEST_ERROR: i18n.t('common.errors.serverError'),
+    DEEPL_NOT_CONFIGURED: i18n.t('common.errors.translationFailed'),
+    DEEPL_UNSUPPORTED_TARGET_LANGUAGE: i18n.t('common.errors.invalidInput'),
+    DEEPL_TIMEOUT: i18n.t('common.errors.translationFailed'),
+    DEEPL_CONNECTION_ERROR: i18n.t('common.errors.networkError'),
+    DEEPL_REQUEST_ERROR: i18n.t('common.errors.translationFailed'),
+    DEEPL_RATE_LIMIT: i18n.t('common.errors.aiRateLimited'),
+    DEEPL_SERVER_ERROR: i18n.t('common.errors.serverError'),
+    DEEPL_CREDITS_OR_PERMISSIONS: i18n.t('common.errors.translationFailed'),
+    DEEPL_EMPTY_RESPONSE: i18n.t('common.errors.translationFailed'),
+    DEEPL_EMPTY_TEXT: i18n.t('common.errors.pdfTextEmpty'),
+    TRANSLATION_PROVIDER_FAILED: i18n.t('common.errors.translationFailed'),
+    AI_BUDGET_EXCEEDED: i18n.t('common.errors.aiBudgetExceeded'),
+    PDF_ENCRYPTED: i18n.t('common.errors.pdfEncrypted'),
+    PDF_TEXT_EXTRACTION_FAILED: i18n.t('common.errors.processingFailed'),
+    PDF_TEXT_EMPTY: i18n.t('common.errors.pdfTextEmpty'),
+    PDF_AI_INVALID_INPUT: i18n.t('common.errors.invalidInput'),
+    PDF_AI_ERROR: i18n.t('common.errors.processingFailed'),
+    PDF_TABLES_NOT_FOUND: i18n.t('common.errors.pdfNoTables'),
+    PDF_TABLE_EXTRACTION_FAILED: i18n.t('common.errors.processingFailed'),
+    TABULA_NOT_INSTALLED: i18n.t('common.errors.serverError'),
+  };
+  return map[errorCode] ?? null;
+}
+
 export function getTaskErrorMessage(error: unknown, fallback: string): string {
+  if (isTaskErrorPayload(error)) {
+    // Prefer a translated message keyed by error_code
+    if (typeof error.error_code === 'string') {
+      const translated = resolveErrorCode(error.error_code);
+      if (translated) return translated;
+    }
+  }
+
   if (typeof error === 'string' && error.trim()) {
     return error.trim();
   }