How to Add a Signature to a PDF for Free (No App Required)
Three reliable ways to sign a PDF without DocuSign, Adobe Acrobat, or any paid app — including a phone-friendly method that takes under a minute.
You've been asked to sign and return a PDF. You don't have Adobe Acrobat. You don't want to create a DocuSign account just for one signature. And printing-signing-scanning belongs in 2005.
Here are three free methods that actually work in 2026 — pick the one that matches your device.
Method 1: Use your phone's photo (fastest)
Best when: you have a printed-out signature on paper, or are happy to sign on a blank sheet.
- Sign your name in dark ink on a white piece of paper.
- Take a clear photo of just the signature.
- Use the Image to PDF tool if you need it as its own PDF — but more commonly you'll want to combine the signature page with the original document.
- Use Merge PDF to add your signature page to the document.
This takes about 60 seconds end to end and produces a legally acceptable signature for most non-legal contexts (consent forms, internal approvals, simple agreements).
Method 2: Use your computer's built-in tools
On Mac: Preview has a built-in signature tool. Open the PDF in Preview → Markup toolbar → Signature → Create Signature. You can sign with your trackpad or hold a paper signature to your webcam.
On Windows 11: Open the PDF in Microsoft Edge → click the pen icon in the toolbar → draw your signature with mouse or touchscreen → save the PDF.
Both methods are 100% offline and free. After signing, if the resulting file is too large to email, run it through Compress PDF.
Method 3: Use a tablet/iPad
If you have an iPad or Android tablet with a stylus, you have the best signing experience available — better than most paid signing platforms.
- iPad: Open the PDF in Files → Markup → sign with Apple Pencil.
- Android: Open in Drive → Annotate → sign with S-Pen or finger.
Save and you're done.
What about legally-binding eSignatures?
For documents that need a court-admissible electronic signature (real estate, employment offers, NDAs with companies that require it), the methods above may not be enough. You'd want a service that provides an audit trail (timestamp, IP, identity verification). DocuSign, HelloSign, or your country's eIDAS-compliant equivalent are the right call there.
For everything else — most everyday "please sign and return" requests — the free methods above are perfectly acceptable.
After signing, protect the file
A signed PDF is a sensitive document. If you're emailing it back, consider adding a password before sending. Use Protect PDF to set a password, then share the password with the recipient through a separate channel (text, phone).
Ready to sign?
If you went the photo route, combine your signature with the original document in seconds using Merge PDF, then compress with Compress PDF and send.