Private, offline PDF processing

Custom Stamp

OCR finds clear space and places your chosen stamp on every page of every selected PDF.

Files stay on this computer

Step 1

Choose PDFs

0 PDFs
Stamp options

OCR can shrink the stamp further when space is limited.

Leave empty to use the included red stamp design.

Step 2

Stamp every page

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Instructions and important limitations

How to use it

  1. Select or drop one or more PDFs in Step 1.
  2. Open Stamp options, choose the maximum stamp size, and optionally select a one-page custom stamp PDF.
  3. Select Stamp selected PDFs.
  4. Wait while offline OCR checks every page for a clear area. If no suitable area exists, the tool adds a clear margin before stamping.
  5. When processing finishes, your browser downloads the results ZIP. Review every stamped PDF before using it.

What the ZIP contains

  • One stamped PDF per source PDF - named from the original and containing the stamp on every page.
  • PROCESSING-REPORT.txt - lists successes, errors, page counts, and any pages where a clear margin was added.

Limits

  • Custom stamp artwork must be a one-page PDF. You must have the right to use the artwork.
  • OCR helps avoid existing writing, but automated placement is not perfect. Always review the output.
  • Password-protected or encrypted PDFs cannot be modified in this browser build. Remove the password first.
  • Each input PDF can be up to 250 MB. Large files and large batches need more browser memory and may take longer.
  • Stamping creates a new PDF and may invalidate existing digital signatures.
  • Original PDFs are never overwritten.