About

Sign PDF

Draw or upload a signature and stamp it on any page of a PDF — a visible signature, not a cryptographic one. Runs in your browser; the PDF never leaves your device.

Drop a PDF file here or
One PDF at a time.
  1. Drop a PDF.
  2. Either draw your signature on the pad with mouse or touch, or switch to Upload image and pick a saved PNG/JPG of your signature.
  3. Pick the page, corner, and size of the signature. Bottom-right at 160pt is the default — a visible but modest stamp.
  4. Click Sign and download. The signed PDF downloads automatically.
What does it do?

The tool decodes your signature (either the drawn canvas or the uploaded image), embeds it in the PDF, and stamps it on the chosen page using pdf-lib. The output is a standard flattened PDF that opens in any viewer.

Example

Input:    offer-letter.pdf (3 pages)
Signature: drawn on pad, dark navy ink
Placement: page 3, bottom-right, 180pt wide
Output:    offer-letter-signed.pdf

What this tool is not

  • Not a cryptographic signature. The output is a visible stamp, nothing more — equivalent to printing, signing, and re-scanning. It carries no cryptographic proof of identity and is trivially forgeable by anyone who can extract the image.
  • Not an audit trail. No IP logging, no email verification, no record of when the signature was applied. For regulated signing (healthcare, legal, financial), use DocuSign, Adobe Acrobat Sign, or a similar service.
  • Not multi-signer. Stamps a single signature on a single page. Workflows where multiple parties each sign specific fields need a different tool.
Frequently asked questions

Is this a legally binding electronic signature?

No. This tool produces a visual signature stamp — the same thing you'd get from printing, signing, and rescanning. It is not a cryptographic digital signature and carries no audit trail. For legally binding workflows (contracts, regulated industries), use a service like DocuSign or Adobe Acrobat Sign that provides identity verification and tamper-evident signatures.

What does the tool actually do?

You draw a signature on the pad (or upload a PNG of your signature), pick which page and corner of the PDF to stamp it on, and the tool flattens the signature image into the chosen page using pdf-lib. The output is a standard PDF that any viewer opens.

Can I upload an existing signature image instead of drawing?

Yes. Click "Upload image" and pick a PNG or JPG of your signature. PNG is preferred — its transparency lets the signature blend with any background. JPG always paints a white rectangle behind the signature because JPG cannot hold transparency.

Can I sign many PDFs with the same signature?

Not in this version — the tool processes one PDF at a time to keep the page/position picker simple. If you need to apply the same signature to many similar documents, draw it once, use the browser's download button to save it as a PNG, and re-upload it into each subsequent PDF.

My signature looks pixelated on the output.

Drawing pads are capped at a size the browser can render smoothly. At high DPI (300+) the drawn signature may not have enough detail for print. For crisper output, sign on paper, scan at 300 DPI, and upload that as a PNG instead.

Do you save the PDFs I sign here?

No. We don't save the PDF, the signature you draw, or the signed output you download. Everything is discarded the moment you close or refresh the tab. You can verify in your browser's developer tools.