Sign PDF

Sign PDF in short

Add a PDF, then draw your signature or upload an image of it, then click the page where it should go, then download. It's free, there's no sign-up, and it runs in your browser, so the file never leaves your device.

Guides

• What happens to signatures when you merge PDFs

  Image signatures survive a merge; certificate-based digital signatures don't. Why merging breaks them, and how to combine signed documents safely.

• Is iLovePDF safe? And Smallpdf? What happens to your files

  What iLovePDF and Smallpdf say they do with the files you upload, how long they keep them, what their certifications cover, and how to check for yourself whether any PDF tool uploads your file.

• How to sign a PDF

  Sign a PDF free in your browser, either by drawing your signature on the page or by adding a certificate-based digital signature. Which one you need, the steps for each, and what breaks a signature.

• How to flatten a PDF, and when you should

  Flattening locks form answers, comments and stamps into the page so nobody can change them. What it does, when to do it, the steps, and what it can't undo.

Sign PDF: common questions

Is Sign PDF free?

Yes. Sign PDF is free and works without an account, for files up to 25 MB and 150 pages. A free account raises that to 50 MB and 400 pages.

Are my files uploaded to a server?

No. Sign PDF runs in your web browser, so the file is read on your own device and never sent to ConvertFile.

Is a signature added with Sign PDF legally binding?

Sign PDF places an image of your signature. It is not a certificate-based digital signature and doesn't prove who signed or detect later changes. Whether an image signature is acceptable depends on who you are sending it to.

Does Sign PDF work on Mac, Windows, Android and iPhone?

Yes. It runs in any modern web browser, with nothing to install. Very large files work best on a desktop or laptop, because in-browser tools use your device's memory.