asantoolAdd a digital signature to a PDF
Sign a document on screen rather than on paper. Worth knowing before you start: most people searching for this want a signature they can put on a PDF, and that is what this does. If you have been asked for a certificate-based signature, that is a different thing and this page says so plainly below.
Drop the PDF you need to sign
PDFUp to 100 MB · Your files never leave your device4 steps, no waiting.
- 01Add your PDFDrag the file onto the page or pick it from your device. Nothing is uploaded — it opens straight in the browser.
- 02Sign on the pageTap where the signature goes and draw it, or switch to Type and enter your name in a handwriting face.
- 03Place and size itDrag it onto the signature line and resize it by the corners. Zoom in if the line is small.
- 04DownloadThe signature is written into the PDF and prints the same way everywhere.
Common questions
Is this a real digital signature?
It is an electronic signature: your handwriting, applied to the document. A digital signature in the strict sense is a cryptographic certificate issued by a certificate authority, which binds the signature to your identity and shows if the file was altered afterwards. This tool does not issue certificates, and no browser-only tool can.
Which one do I actually need?
For everyday agreements — a contract, a form, a letter, a permission slip — an electronic signature is what is being asked for and what this produces. If a government portal, a bank or a tender process specifically requires a qualified or certified signature, you need a certificate provider instead.
Can I tell which one a document is asking for?
The wording usually gives it away. "Sign and return" means an electronic signature. Anything mentioning a certificate, a digital ID, a token, a smart card or a qualified trust service provider means the cryptographic kind.
Is my document uploaded anywhere?
No. Every PDF tool here runs inside your browser. The file is read from disk, worked on in memory, and written back out — it is never sent to a server. That matters more for documents than photos: contracts, statements and ID scans are exactly the things you should not be uploading to a stranger's website.