Sign a PDF
Drop a PDF, draw your signature, and stamp it onto the page you choose, then download the signed file. Everything runs in your browser, so the document and your signature never leave your device.
About signing PDFs
You draw your signature on the pad with the mouse, a finger, or a stylus, and the tool stamps that drawing as an image onto the page you pick using pdf-lib. You control which page is signed (the last page by default), which bottom corner the signature sits in, and how wide it is. The signature keeps the proportions of what you drew and becomes part of the page content, so it shows up in every viewer.
Is it private?
Yes. Both the drawing and the stamping run entirely in your browser using pdf-lib, a pure-JavaScript library. Nothing is uploaded, stored, or seen by us, and there is no server involved. Note that this is a visible stamped signature, not a cryptographic or certified e-signature.
Frequently asked questions
- Is my PDF uploaded to a server?
- No. You draw the signature and it is stamped onto the page entirely in your browser using pdf-lib, a pure-JavaScript library. Your file is never sent anywhere, and the tool keeps working even if you go offline after the page loads.
- Is this a legally binding electronic signature?
- It adds a visible drawn signature as an image on the page, the same as a scanned wet signature. It is not a cryptographic or certified e-signature, so it carries no digital identity or tamper-evidence. For agreements that require a certified signature, use a dedicated e-signature service.
- Where does the signature go on the page?
- You choose the page (by default the last one) and the bottom corner (right, left, or center), and you set the width with a slider. The signature keeps the proportions of what you drew and sits a small margin in from the page edge.
- Is it free, and do I need an account?
- It is free with no watermarks, no daily caps, and no sign-up. Drop a file, draw your signature, place it, and download the result.