Digitally sign a PDF
A real digital signature, not a picture of one. The PAdES signature is embedded so any later change to the document invalidates it — and you can still place a visible stamp where a signature is expected.
How to digitally sign a PDF
Upload the PDF you need to sign.
Position a visible signature stamp on the pages that need one.
Apply the signature and download the signed PDF.
Frequently asked questions
How is this different from pasting an image of my signature?
An image proves nothing. A digital signature is cryptographically bound to the file's contents, so tampering after signing is detectable.
Will a viewer show it as signed?
Yes. PAdES is the PDF signature standard, so compliant readers such as Adobe Acrobat display the signature and its status.
Related tools
- Password protect a PDFEncrypt a PDF with a password using AES-256, and control whether recipients can print, copy or edit it. Free online.
- Watermark a PDFStamp a text watermark across PDF pages — diagonal or tiled, with control over font, size, colour, opacity and angle. Free online.
- Redact a PDFPermanently delete sensitive content from a PDF — search terms, auto-detected personal data, or areas you draw. Free online.
- Merge PDF filesCombine multiple PDFs into one file in the order you choose. Free, fast, and no account needed — your files are deleted automatically.
Your files stay private
Files you upload without an account are processed and then deleted automatically — they are never added to anyone's storage and are not used to train anything. Transfers are encrypted in both directions. Create a free account if you would rather keep your documents in a private vault, or see the pricing plans for unlimited use.