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Add a signature block to a PDF document.
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Sign PDF adds your signature to a PDF, drawn directly or placed as an image, and lets you position and size it on the page, so you can sign contracts and forms without printing, scanning, or posting.
It's important to understand the type of signature this creates. Placing a visible signature image is an electronic signature, widely accepted for everyday agreements and forms. It's distinct from a cryptographic digital signature, which certifies identity and detects tampering, so for high-stakes legal documents that require verified e-signatures, a dedicated service is the right tool, while routine paperwork is well served here.
For the cleanest result, use a transparent PNG of your signature so it sits naturally without a white box, pairing with Background Remover prepares one easily. You can also draw directly, which is handy on touchscreens and tablets.
Signing runs in your browser, so your document stays private, with no watermark or limit. Once exported the signature is part of the page, so keep an unsigned master copy. Pair it with PDF Editor and the rest of the ToolsMonk PDF suite.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | PDF Tools |
Upload the PDF to sign
Add your signature (drawn or as an image)
Position and size it on the page
Download the signed PDF
Adds a signature to a PDF document
Place a drawn or image signature where you need it
Position and size the signature on the page
Runs in your browser, your document is never uploaded
No watermark on the output
Free, with no limit
Signing a contract or form before returning it
Adding your signature to a document without printing
Placing initials or a signature block on a PDF
Signing paperwork digitally for convenience
Use a transparent PNG signature (via Background Remover) for a clean look with no white box
For high-stakes legal documents, use a certified e-signature service; this suits routine forms
Keep an unsigned master copy of the document
Common questions about this tool, its workflow, and what to expect before you use it.
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Preview
Add a signature block to a PDF document.
Use Sign PDF free →Live tool (iframe)
Readers use the real, working tool right on your page, with a small credit line underneath.
Embed card (HTML)