Sign PDF

This tool runs entirely client-side: your PDF is never uploaded to a server. Once loaded via PDF.js, you create a signature using one of three methods — drawing freehand on a canvas signature pad, typing your name which is rendered in a cursive script font, or uploading an existing image of your signature.

Whichever method you use, the signature is captured as a PNG image (the canvas drawing and typed text are both rendered to a canvas and exported; an uploaded image is used directly), which you then position by clicking the location on the PDF preview where it should appear.

On save, PDF-lib loads the original PDF, embeds your signature PNG using its embedPng function, and draws it onto the exact page and coordinates you selected at the size you chose — the signature becomes a permanent part of that page's visual content, similar to how a physical signature ink stamp works.

Your files are uploaded over an encrypted (SSL) connection. We don't store, read, or share the contents of your files — they're processed to generate your result and are not retained on our servers afterward.

• Signing a contract or agreement electronically without printing, signing by hand, and re-scanning it.
• Adding a signature to a form that needs to be returned quickly by email.
• Countersigning a document that's already been signed by another party.

• Assuming every electronic signature carries the same legal weight — requirements vary by document type and jurisdiction; for high-stakes legal contracts, confirm an e-signature is acceptable for your specific situation.
• Placing the signature in the wrong location on a multi-page or multi-signature document — double-check placement before finalizing.

• A typed or drawn signature is convenient for everyday documents; for formal contracts, check whether your recipient requires a specific e-signature standard.

We respect your privacy. All files are processed securely and are never sold, shared, or used for anything beyond generating your result.