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Signature stamp

Load .sig / .p7s / .p7b, verify, and place a visual stamp.

  1. 1Files
  2. 2Settings
  3. 3Run
  4. 4Result

1. Files

Source file

Accepted formats: .pdf, .jpg, .jpeg, .png, .bmp, .tif, .tiff, .webp, .docx, .xlsx, .pptx

Signature file (.sig / .p7s / .p7b)

Accepted formats: .sig, .p7s, .p7b

3. Run

Attach a file to continue

How it works

  1. 1Upload the signed PDF and the signature file (.sig, .p7s, or .p7b).
  2. 2The service parses the certificate: holder, serial number, validity, issuing authority.
  3. 3Place a visual stamp on the chosen page and download the document.

Frequently asked questions

Are GOST signatures supported?
Yes, both CMS/PKCS#7 and Russian GOST signatures are parsed.
Does the signature stay valid?
Yes — the stamp is a visual layer and does not break cryptographic integrity.
How do I add several stamps?
Process the file once per .sig so every signature gets its own stamp on the page.

Read the full guide: How to Add a Digital Signature Stamp to a PDF →