Draw a signature with your mouse or finger (or type one), click where it belongs on the page, and download the signed PDF — the whole process happens on your device.
Your PDF is displayed using the renderer already built into your browser, so the page you click on is exactly the page that gets stamped. Draw your signature on a small canvas with a mouse, trackpad, or fingertip — or type your name and use a handwriting-style font instead — then click the spot on the document where it belongs. When you download, pdf-lib writes the signature into the file as a flattened image that prints and displays like any other page content.
What this tool produces is a picture of your signature embedded in the page — not a cryptographic signature backed by an identity certificate, so a viewer such as Acrobat will not display a verified-signer banner. For the paperwork most people actually sign — leases, consent forms, permission slips, freelance agreements — a visual signature is what the other side expects and accepts. If a counterparty specifically demands certificate-based signing with identity validation, use a dedicated e-signature service for that document.
Think about what a lease or an employment contract contains: your salary, your home address, sometimes an ID number, and a copy of your signature — everything needed to impersonate you. Handing that bundle to an unknown server just to add a squiggle is a poor trade. On this page, the document is opened, rendered, stamped, and rebuilt by code running on your own machine, and neither the file nor your drawn signature is transmitted anywhere. There is also no account to sign up for and no per-day cap; several well-known alternatives limit free users to one or two documents before asking for payment.
A minority of government and institutional PDFs are built on XFA, a dynamic-form technology that standard PDF libraries cannot rewrite. If you load one, the tool tells you plainly instead of producing a corrupted file. Ordinary PDFs — scans, exports from Word, and standard fillable forms — work as expected.
No. Rendering, stamping, and saving all happen inside your browser tab, and no part of the file or your signature crosses the network. The tool keeps working even if you go offline after the page loads.
Laws such as the US ESIGN Act and the EU's eIDAS regulation generally recognize simple electronic signatures for routine agreements like leases and consent forms. Requirements vary by document and jurisdiction, so check whether your situation calls for a certified digital signature instead.
Yes. If drawing with a mouse feels clumsy, type your name and the tool renders it in a signature-style font that you place on the page the same way.
Those forms use XFA, a dynamic format that pdf-lib cannot modify. The tool detects XFA and reports it clearly rather than saving a file that might not open correctly.
It is flattened into the page content, so it has no separate field a reader could drag around. Like anything in a PDF without cryptographic protection, a determined person with editing software could still alter the document.