PDF Sign
Sign any PDF in your browser. Draw, type, or upload your signature. Drag and resize on any page. Nothing is uploaded.
What is PDF Sign?
PDF Sign lets you add a signature to any PDF without uploading it to a server. You can draw with mouse or finger, type your name in a cursive font, or upload a photo of your signature. Once you create a signature, drag it onto the page wherever you need it, resize, and rotate. Multiple signatures per document are supported.
The whole tool runs in your browser using pdf.js for rendering and pdf-lib for write-back. No account, no upload, no watermark on the output.
How to sign a PDF
- Drop a PDF onto the workspace or click to browse.
- Click Add signature. A modal opens with three tabs: Draw, Type, Upload.
- Pick a method, build your signature, click Use this signature.
- The signature appears centered on the current page. Drag it to position. Use the corner handle to resize. Use the round handle on top to rotate.
- Repeat to add more signatures, or use the Initials and Today quick stamps for fast filling.
- Click Download signed PDF when done.
Features
- Draw, Type, or Upload: three input methods with live preview.
- Six cursive fonts for typed signatures: Caveat, Dancing Script, Sacramento, Allura, Great Vibes, Pacifico.
- Auto background removal for uploaded signature images: white pixels become transparent.
- Drag, resize, rotate on canvas with crisp handles.
- Quick stamps: initials and today's date with one click.
- Multi-page support: signatures persist per page, navigate with arrows or keyboard.
- Pen color and thickness controls in Draw mode.
- No upload: file stays on your device, even when offline.
Privacy and how it works
Most online PDF signing services store your file on their server, often for at least the duration of the editing session. This tool does not. Two open-source libraries do all the work locally:
- pdf.js reads your PDF and renders each page to an HTML canvas.
- pdf-lib embeds your signature image into the PDF and writes the result.
When you click Download signed PDF, the resulting bytes become a Blob in browser memory and your browser saves it like any other download. No network request is made for your file at any step.
Are these signatures legally valid?
For most everyday agreements (NDAs, simple contracts, internal forms, vendor approvals), an image-based signature is legally binding under most jurisdictions including the U.S. ESIGN Act and EU eIDAS Simple Electronic Signature category. The recipient has to be able to see the signature and the document has to be sent or shared between consenting parties.
For higher-stakes documents (real estate transfers, court filings, certain regulated contracts), check with a lawyer in your jurisdiction. You may need a Qualified Electronic Signature (QES) provider that issues a cryptographic certificate, which is beyond what an in-browser tool can offer.
Frequently asked questions
Can I sign a multi-page PDF?
Yes. Use the page navigation buttons or arrow keys to move between pages. Each placement remembers which page it was placed on. The downloaded PDF will have all signatures on their respective pages.
Can I use the same signature on multiple pages?
Click Add signature, build it, place it. Then navigate to the next page and click Add signature again. The previous signature is reused (the modal pre-fills your last build).
Why does my uploaded signature look pixelated?
The tool keeps the image at its native resolution. If your photo was taken at a low resolution it will look pixelated when scaled up. For best results, scan at 300 DPI or take a photo from directly above with good lighting.
Why is my white background not removed completely?
The auto background removal targets pixels with average brightness above 220 out of 255. If your scan has a yellowish or grey background, it may not be detected. Try using a brighter scan, or use Draw mode instead.
What about encrypted or password-protected PDFs?
Run them through the Unlock PDF tool first. PDF Sign does not handle password decryption.