Sign PDF
Add your signature to a PDF document — draw, type, or upload an image
Drop your files here
or click to browse
Sign PDF — Free Online Tool
Add digital signatures to PDFs. This tool runs entirely in your browser — your files are never uploaded to any server. No sign-up required, no watermarks, no file size limits. Works on Windows, Mac, Linux, iPhone, and Android.
How to use Sign PDF
- Open this page in any modern browser (Chrome, Firefox, Safari, Edge)
- Drop your file(s) into the upload area or click to browse
- Adjust any settings if available
- Click the process button and download your result
Why choose Sign PDF?
- ✓100% private — files are processed in your browser, never uploaded
- ✓Completely free — no sign-up, no watermarks, no limits
- ✓Instant processing — no server queues, no waiting
- ✓Works everywhere — Windows, Mac, Linux, iOS, Android
Sign PDF — frequently asked questions
Are electronic signatures legally valid?+
Yes. Electronic signatures are legally valid under the US ESIGN Act and EU eIDAS for virtually all documents.
Can I sign a password-protected PDF?+
You need to unlock it first. Password-protected PDFs cannot be edited until the password is removed.
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