Sign a PDF
Draw a signature or type your name, then drag it onto the page.
How it works
The documents people sign are the most sensitive files they will ever put through a web tool: leases, offer letters, NDAs, medical forms, tax paperwork. Almost every free signing site uploads that document to a server, processes it there, and asks you to trust a retention policy. This one does not have a retention policy, because it never receives the file.
Drawing or typing your name
You can draw a signature or type your name in a cursive face. Typing is usually the better option on a laptop, where a signature drawn with a trackpad rarely resembles anyone's real handwriting. Both produce the same thing: a transparent PNG composited onto the page. The cursive fonts are served from this site rather than a font CDN, so typing your name does not generate a request to anyone else.
Not a certificate-based signature
What this produces is an image of your signature on the page: the same legal instrument as signing a printout and scanning it. Under the US ESIGN Act and eIDAS in the EU that is generally treated as a valid electronic signature for ordinary agreements. It is not a certificate-based digital signature. No certificate is involved, so there is no cryptographic proof of who signed and no tamper-evident hash. If a counterparty specifically requires a certificate-based or qualified electronic signature, or the document is going to a court or a land registry, you need a different provider. Saying so plainly is more useful than letting you find out later.
Dragging onto the visible box
You position the signature by dragging it on a rendering of the real page, so there is nothing to estimate. The placement is stored as a percentage of the visible box, the area a viewer displays and the one you dragged on, so the same setting lands in the same visual spot on Letter, A4 and Legal. That box is smaller than the sheet on a print-ready contract, where trim and bleed sit outside the page, and measuring from the sheet instead would drop the signature outside the visible area altogether.
The signature is rasterised at three times display size, which keeps it sharp when the document is printed or zoomed. Nothing about it is kept. Reload the page and it is gone.
Questions
Is my PDF uploaded?
No. The PDF is read into memory by the browser, modified by a WebAssembly PDF library running in a Web Worker, and written back out as a download. Open the Network tab in developer tools and sign a document. No request carries your file.
Is this legally binding?
For ordinary agreements in most jurisdictions, an image-based electronic signature is valid, and this is the same thing you produce by signing a printout and scanning it. It is not a certificate-based digital signature and carries no cryptographic proof of who signed. For anything that specifically demands a qualified electronic signature, use a certificate-based provider.
Can I sign a password-protected PDF?
That depends on what the protection covers. Most encrypted PDFs are locked against printing or editing rather than against opening, and those are read and signed normally, because no password is needed to decrypt them. A PDF that asks for a password before it will open is refused, and the message says so instead of reporting a damaged file. This tool never asks you for a password. Signing does rewrite the document, so the signed copy is not guaranteed to carry the original's printing and editing restrictions.
Does it work on a phone?
Yes, and drawing a signature with a finger is generally better than with a mouse. Very large documents are constrained by phone memory; the tool tells you up front if a file is too big rather than reloading the tab halfway through.