Sign a PDF
Sign PDF lets you draw a signature with your mouse or finger, or type one, then drop it onto the page — no printing, scanning or posting. Ideal for contracts, letters and forms you need to return quickly.
Your signature and your document are handled entirely in the browser, so nothing sensitive is uploaded.
How to sign a PDF in three steps
- Open the PDF you need to sign.
- Draw or type your signature, then place and size it where it belongs.
- Save and download the signed PDF.
Why Sign PDF runs on your device
Everything happens on your device. The moment you choose a file, Sign PDF loads it directly into your browser's memory and does all the work there with WebAssembly and JavaScript — the bytes never travel to a server, because there is no server in the loop. FreePDFX enforces a strict Content-Security-Policy whose connect-src 'self' rule makes it physically impossible for this page to send your document anywhere, even by mistake. Want proof? Open your browser's Network panel and watch, or simply switch off Wi-Fi first. As an installable Progressive Web App, it keeps working fully offline once the tools are cached. FreePDFX sets no advertising or analytics cookies today, and keeps only small settings you can see and wipe any time — your PDFs are never among them, because they are never received.
Lossless — nothing is re-encoded
This is a lossless operation. Your original pages are copied byte-for-byte into the result, so text stays selectable, images keep their exact quality and vector graphics stay razor-sharp — nothing is rasterised, re-compressed or downgraded. The signature is placed as an overlay while the underlying pages are copied intact, so the signed file matches the original everywhere else.
Free forever, with no sign-up and no watermarks on your results. FreePDFX exists to give you the everyday PDF tools you need without handing your documents to a stranger's server. Every tool is honest about what it can and cannot do, so you always know whether you are getting a byte-perfect result or a solid best-effort one before you download.
Frequently asked questions
Are my files uploaded anywhere?
No. Sign PDF runs entirely inside your browser. Your file is opened in local memory and processed with WebAssembly and JavaScript, and the site's Content-Security-Policy blocks every network connection except to FreePDFX's own files — so your document simply has no route off your device.
Does this work offline?
Yes. FreePDFX is an installable Progressive Web App. After your first visit the tools are cached, so you can add it to your home screen or desktop and keep using Sign PDF with the Wi-Fi off — nothing needs to download again.
Is there a file size limit?
There's no server-side limit, because nothing is uploaded. The only ceiling is your own device's memory: very large or high-resolution PDFs use more RAM, so an older phone handles less than a modern laptop. If a huge file struggles, close other tabs and try again.
Do I need to sign up or pay?
No. FreePDFX is free and needs no account, email or payment. Open a file and go — there's nothing to register, and no watermark is added to your results.
Is this a legally binding e-signature?
It adds a visible signature image to the page, which is enough for most everyday agreements. It is not a cryptographic digital certificate, so check your jurisdiction if you need certified signing.
Can I reuse my signature?
You can redraw or retype it whenever you sign; nothing is stored on a server.