Sign PDF: how it works
To sign a PDF, open the Sign PDF tool, add your file, draw or type your signature, place it on the page, and download. The signature is added in your browser and the document is never uploaded.
How to use Sign PDF
- Open the Sign PDF tool and add your PDF.
- Draw or type your signature.
- Position it on the page and download the signed PDF.
In your browser vs. uploading to a server
Best for adding a visible handwritten-style signature to an agreement quickly and privately. For cryptographic digital signatures, use dedicated e-signature software.
Frequently asked questions
How do I sign a PDF for free?
- Open the Sign PDF tool, draw or type your signature, drop it where it belongs, and download; it is free and done entirely in your browser.
Are my files uploaded to a server?
- No. PDFER runs entirely in your browser using WebAssembly and JavaScript. Your files are read into memory on your device, processed locally, and never sent to PDFER or any third party. Closing the tab or leaving the tool erases them from memory.
PDFER is a privacy-first PDF toolkit built by Kiril Urbonas. Every tool runs entirely in your browser — see our security model and privacy policy.