diff --git a/backend/app/routes/pdf_convert.py b/backend/app/routes/pdf_convert.py
index 463f2c9..a1c91e6 100644
--- a/backend/app/routes/pdf_convert.py
+++ b/backend/app/routes/pdf_convert.py
@@ -143,7 +143,7 @@ def pptx_to_pdf_route():
 
 
 # ---------------------------------------------------------------------------
-# Sign PDF — POST /api/pdf-tools/sign
+# Sign PDF — POST /api/convert/sign
 # ---------------------------------------------------------------------------
 @pdf_convert_bp.route("/sign", methods=["POST"])
 @limiter.limit("10/minute")
diff --git a/frontend/src/components/tools/SignPdf.tsx b/frontend/src/components/tools/SignPdf.tsx
index 80296f9..41a6763 100644
--- a/frontend/src/components/tools/SignPdf.tsx
+++ b/frontend/src/components/tools/SignPdf.tsx
@@ -38,7 +38,7 @@ export default function SignPdf() {
       fd.append('file', pdfFile);
       fd.append('signature', sigFile);
       fd.append('page', String(page));
-      const res = await api.post<TaskResponse>('/pdf-tools/sign', fd);
+      const res = await api.post<TaskResponse>('/convert/sign', fd);
       setTaskId(res.data.task_id);
     } catch (err) {
       const msg = err instanceof Error ? err.message : t('common.errors.processingFailed');