Windows is the most widely used desktop operating system in the world, yet it has a frustrating gap: unlike macOS, which ships with the Preview app that can sign PDFs natively, Windows has no built-in PDF signing tool. If you have a contract, lease, or form that needs your signature and you are on a Windows PC, you have three realistic free options. Here is how each one works and which is worth your time.
Method 1 — PrimeDocu in Chrome or Edge (Best Overall)
PrimeDocu works entirely in your browser — no download, no installation, no subscription required to get started. It runs on Windows 10 and Windows 11 in Chrome, Edge, or any modern browser.
- Open Chrome or Edge and go to primedocu.com.
- Create a free account — no credit card needed.
- Click Upload and select your PDF from your computer.
- Use the Sign tool to draw your signature with your mouse or touchpad, type it, or upload an image of your signature.
- Drag the signature block to the correct position on the document.
- Click Save & Download to get the signed PDF back to your computer.
The signed document is stored in PrimeDocu's AES-256-GCM encrypted vault and can be downloaded at any time. The free plan includes unlimited PDF signing with no watermarks. This is the closest equivalent to the macOS Preview experience that Windows users have.
Method 2 — Microsoft Edge PDF Viewer (Built-In, Limited)
Microsoft Edge has a built-in PDF viewer that lets you annotate PDFs. You can draw freehand, type text, and highlight content. To use it:
- Right-click your PDF file and choose Open with > Microsoft Edge.
- Use the Draw tool in the top toolbar to draw your signature with a mouse or stylus.
- Click Save (the floppy disk icon).
The important caveat: what Edge produces is an image annotation overlaid on the PDF — it is not a recognised electronic signature. It carries no cryptographic identity, no timestamp, and no audit trail. For internal, low-stakes annotations it is fine. For a legal contract, NDA, or any document where the signature needs to stand up to scrutiny, do not rely on Edge's draw tool.
Method 3 — Adobe Acrobat Reader (Free, Requires Install)
Adobe Acrobat Reader DC is the industry-standard PDF viewer and includes a Fill & Sign feature for basic electronic signatures:
- Download Adobe Acrobat Reader from adobe.com (free, approximately 300 MB install).
- Open your PDF in Acrobat Reader.
- Click Fill & Sign in the right-hand panel, then select Sign yourself.
- Draw, type, or upload your signature image.
- Place the signature and save the file.
Acrobat Reader's free tier handles the majority of everyday signing needs. However, features such as requesting signatures from others, advanced document tracking, and certificate-based digital signatures require an Adobe Acrobat paid subscription.
Comparison Table
| Method | Cost | No download needed | No watermark | Proper e-signature | Encrypted storage |
|---|---|---|---|---|---|
| PrimeDocu (free plan) | Free | Yes | Yes | Yes | Yes (AES-256-GCM) |
| Microsoft Edge Draw | Free (built-in) | Yes | Yes | No — annotation only | No |
| Adobe Acrobat Reader | Free (basic) | No — install required | Yes | Yes | No |
Which Should You Use?
For most Windows users, PrimeDocu is the best choice: it requires no installation, produces a legally valid electronic signature, stores your signed documents in an encrypted vault, and the free plan covers unlimited signing. If you already have Adobe Acrobat Reader installed and prefer a desktop app experience, its Fill & Sign tool is a solid alternative. Use Microsoft Edge's draw tool only for informal annotations — not for contracts or any document with legal weight.
Frequently Asked Questions
Can Windows 11 sign PDFs built-in?
No. Unlike macOS which ships with Preview — a full-featured PDF tool that includes a proper signature feature — Windows 11 has no native PDF signing capability. Microsoft Edge can annotate PDFs with freehand drawing but this is not a legal electronic signature. For a valid e-signature on Windows, you need PrimeDocu, Adobe Acrobat Reader, or another dedicated tool.
Is there a free PDF signer for Windows without watermarks?
Yes. PrimeDocu's free plan lets you sign unlimited PDFs with no watermarks and no credit card required. Adobe Acrobat Reader's Fill & Sign is also watermark-free for basic use. Many other free online PDF signers add watermarks on free tiers, so always verify before uploading sensitive documents.
Does Microsoft Edge let you sign PDFs?
Microsoft Edge lets you draw and type on PDFs, but it does not create a legally recognised electronic signature. The drawn mark is an image annotation with no cryptographic backing, no identity verification, and no audit trail. For contracts or official documents, use PrimeDocu or Adobe Acrobat Reader instead.
Do I need to download anything to sign a PDF on Windows?
With PrimeDocu, no — it works entirely in Chrome or Edge with no installation. Simply visit primedocu.com, create a free account, upload your PDF, sign it, and download the result. Adobe Acrobat Reader requires a roughly 300 MB download and installation. Microsoft Edge is already installed on every Windows 10 and 11 machine.