How to Sign a PDF on Windows Without Adobe

Adobe Acrobat Pro runs about $19.99–$22.99 per month, and the free Acrobat Reader nudges you toward a paid "Fill & Sign" upgrade the moment your needs go past the basics. If you're on Windows and you just need to sign a PDF, you don't need either one. Windows 10 and 11 already ship with a tool that can sign a PDF, and for anything you have to send to someone else or defend later, a dedicated e-signature service does the job in under two minutes.

Here are the three practical ways to sign a PDF on Windows without Adobe, when each one is the right call, and the single trade-off that actually decides between them: whether the signature comes with an audit trail.

The fastest free method: Microsoft Edge

Every copy of Windows 10 and 11 includes Microsoft Edge, and Edge doubles as the default PDF viewer. Its built-in Draw tool lets you sign a PDF with a mouse, trackpad, touchscreen, or pen — no install, no account, no cost.

1. Right-click the PDF and choose Open with → Microsoft Edge.
2. In the toolbar across the top of the document, click Draw (the pen icon).
3. Pick a pen color — black reads most like ink — and set a thin stroke width.
4. Sign directly on the signature line. A mouse works but looks shaky; a touchscreen or an inexpensive USB drawing tablet produces a far cleaner signature.
5. Press Ctrl+S to save. The ink is now embedded in the PDF and travels with the file wherever it goes.

The catch: Edge's Draw tool produces an ink annotation, not a verifiable signature. There is no record of who signed, when they signed, or from what device. For signing something yourself and emailing it back — a permission slip, a one-off internal form — that is perfectly fine. For a contract that two parties will rely on, it is not enough, and the next section explains why.

When it has to be legally binding: an e-signature platform

The difference between drawing on a PDF and a true electronic signature is not the squiggle — it is the evidence behind it. Under the U.S. ESIGN Act and UETA, an electronic signature is legally binding when you can show intent to sign, the signer's identity, and that the document was not altered afterward. A drawn ink mark proves none of those things on its own.

An e-signature platform captures all three automatically through an audit trail: a timestamped record of who opened the document, the email used, the IP address, and a tamper-evident copy of the final signed PDF. If a signature is ever challenged, that audit trail is the actual evidence a court looks at. (For the legal background, see our guide to the ESIGN Act and what makes an e-signature legally binding.)

The workflow on Windows, using DottiSign as the example, takes about two minutes:

1. Open dottisign.com in any browser — Edge, Chrome, or Firefox — and upload the PDF.
2. Drag a signature field onto the page, plus date or text fields if you need them.
3. If you are the only signer, draw or type your signature and download the finished PDF. If someone else has to sign, add their email and send — they sign from a link in any browser, no account or app required.
4. Everyone receives the completed PDF with the audit trail attached.

Use this method any time the document matters to more than just you: client contracts, NDAs, offer letters, vendor agreements, or anything you might need to prove was signed.

The offline option: insert a signature image

If you are not connected to the internet and Edge is not an option, you can drop a signature image into the PDF using free software you may already have.

1. Sign a blank sheet of white paper and photograph or scan it.
2. Crop tightly to the signature and save it as a PNG with a transparent or white background.
3. Open the PDF in LibreOffice Draw (free) or convert it in your tool of choice, then insert the image and position it on the signature line.
4. Export back to PDF.

This works in a pinch, but it shares Edge's limitation — no audit trail — and adds a new risk: a pasted image signature is trivial to copy from one document to another, which makes it the weakest option if authenticity ever matters.

Which method should you use?

Method	Cost	Audit trail	Send to others	Best for
Microsoft Edge (Draw)	Free, built in	No	No	Signing something yourself, fast
E-signature platform	Free tier, then paid	Yes	Yes	Contracts and anything multi-party
Inserted signature image	Free	No	No	Offline, low-stakes documents

The rule of thumb: if the document only matters to you, Microsoft Edge is the fastest free answer. If anyone else relies on it, use a platform that produces an audit trail — that one feature is the difference between a signature that holds up and one that does not.

Frequently asked questions

Is a signature I draw in Microsoft Edge legally binding? It can be, but it is hard to defend. A drawn mark shows a signature exists; it does not prove who made it or that the document is unchanged. For low-stakes personal documents that is usually fine. For contracts, use a tool that records an audit trail.

Does Windows have a built-in signature tool like the Mac's Preview? Not really. macOS Preview has a dedicated signature feature that saves your signature for reuse; Windows has no direct equivalent. Microsoft Edge's Draw tool is the closest built-in option, but it treats your signature as ink, not as a saved, reusable signature.

Can I sign a PDF on Windows for free without installing anything? Yes. Microsoft Edge is already on every Windows 10 and 11 machine and can sign a PDF with its Draw tool. For a legally binding signature with an audit trail, a browser-based e-signature service also requires no installation.

How do I get others to sign the same PDF? Edge and image methods cannot do this — they only sign your local copy. To collect signatures from other people, upload the PDF to an e-signature platform, add each person's email, and send. Each signer gets a private link and signs from any device.