Sign PDF

Sign PDF puts your signature on a PDF without printing it, signing it with a pen and scanning it back. You make the signature once, by drawing it with a mouse, finger or stylus, by typing your name in a handwriting-style font, or by uploading a photo or PNG of the signature you already use. Then you click the page where it belongs, drag it into the box on the form, resize it from the corner and download the signed copy.

Most contracts, leases, permission slips and timesheets need more than the signature, so the tool also places lines of text: your printed name, your initials or the date, with a one-click button for today. Each item can go on any page, and a document can carry up to 50 of them, which covers an agreement that asks you to initial every page and sign the last one.

Everything happens in your browser. The PDF is read, drawn and rewritten on your device with pdf.js and pdf-lib, and it is never uploaded, so a contract with your address, salary or account number on it stays with you. That is also why it works with the network switched off once the page has loaded.

Be clear about what kind of signature this is. The tool adds an electronic signature: a picture of your signature, stamped onto the page. That is what most people mean by signing a PDF, and in many countries it is accepted for everyday agreements, but it is not a certificate-based digital signature, the kind that proves who signed and shows a warning if anyone edits the file afterwards. If a bank, court or government portal asks for a digital signature with a certificate, use the software it names. One more consequence of rewriting the file: if the PDF already carries a digital signature from someone else, that signature stops validating once you add yours, so ask for the document to be signed in order.

A worked example. A two-page rental agreement arrives as lease.pdf. Draw your signature, click Place signature and click the line on page 2. Drag the corner until it fits the box. Click the calendar button, which fills in today's date, click Place text and drop the date beside the signature. Go back to page 1 and add your initials at the bottom. Download saves lease_signed.pdf with both pages, the original text untouched and selectable, and your three additions on top.