Sign a PDF online
Add your signature to any PDF. Draw it, type it or upload a picture, then place it. Free and private.
Runs in your browser. Your file isn’t uploaded.
How to use Sign PDF
- Step 1Choose your PDF.
- Step 2Draw, type or upload your signature, then drag it into place.
- Step 3Download the signed PDF.
Why use DoMyPDF’s Sign PDF
Free to use
Sign PDF is free for 3 files a day with no sign-up and no watermark. Premium removes the daily limit for heavy use.
Private by design
It runs inside your browser, so your file never leaves your phone or computer, and it keeps working on a slow connection.
Works on every device
Use it on iPhone, iPad, Mac or a Windows PC, in any modern browser. Nothing to install, and you can add DoMyPDF to your home screen.
Quality first
Gives you the result in seconds, with no watermark added to your pages.
Tips for the best result
- Sign PDF saves a new copy; your original file isn’t changed, so you can always start again.
- Working on a phone? Large PDFs with many photos are quicker if you compress them first.
- Combine tools for bigger jobs: merge files, then add page numbers, then compress the result.
- Before sharing a document with private details, use Redact PDF to remove them for good, then Lock PDF to add a password.
- Every page stays sharp: text and pictures are kept at their original quality unless you choose to compress.
Sign PDF questions
Is Sign PDF free?
Yes. Every tool is free for 3 files a day, with no sign-up. Premium removes the daily limit.
Is my file safe?
Your file is processed inside your browser and is never uploaded.
Is this a legal e-signature?
It adds a picture of your signature, which many everyday documents accept. It isn’t a certified digital signature.
Does Sign PDF work on iPhone, iPad and Mac?
Yes. Sign PDF works in Safari, Chrome, Edge and Firefox on iPhone, iPad, Mac and Windows computers, with nothing to install. You can also add DoMyPDF to your home screen to open it like an app.
Is there a file size limit?
No fixed limit: Sign PDF runs on your own device, so it handles files as large as your phone or computer can open. Very large files (over about 100 MB) can be slow on older phones.
Do I need an account?
No. There is no sign-up and no email needed. Open the tool, choose your file and download the result.