How to Sign a PDF on Windows

Windows does not include a dedicated PDF editor the way macOS bundles Preview, but you still have several solid options for signing a PDF without paying for software. Microsoft Edge handles basic PDF annotation for free, Adobe Acrobat Reader has a limited but functional free signing mode, and browser-based tools handle the more complex workflows. This guide walks through each approach so you can pick what fits your situation.

Method 1: Sign Using Microsoft Edge

Microsoft Edge is the default browser on Windows 10 and 11, and it doubles as a capable PDF viewer with annotation tools built in. Open your PDF by dragging it into an Edge browser window or right-clicking the file and choosing Open With > Microsoft Edge.

Once the PDF is open, look for the Draw tool in the toolbar at the top of the Edge window — it looks like a pen. Click the dropdown arrow next to it to choose a pen color and line thickness. Select a thin black line to simulate an ink signature. Then draw your signature directly on the signature line in the document using your mouse or, if you have a touch-enabled screen or stylus, using your finger or pen.

When you are done, click the Save icon (or press Ctrl+S) and choose whether to save it to the same file or a new copy. Edge does not have a dedicated signature panel the way Adobe does, so this method is essentially freehand drawing. The result looks handwritten but works fine for most everyday documents. The limitation is that it produces a drawing annotation rather than a cryptographically attached signature, which is worth noting for higher-stakes documents.

Method 2: Sign Using Adobe Acrobat Reader (Free)

Adobe Acrobat Reader is the most widely recognized free PDF viewer on Windows. The free version includes a Fill & Sign tool that lets you add a proper signature to any PDF. Download Acrobat Reader from Adobe's website if you do not already have it, then open your PDF.

In Acrobat Reader, click the Fill & Sign button in the right-side panel, or find it under the Tools menu. The Fill & Sign toolbar appears at the top of the document. Click the pen icon labeled Sign and choose Add Signature from the dropdown. You will see three options: Type (types your name in a script font), Draw (draw with your mouse or touchscreen), or Image (upload a photo of your handwritten signature).

The Draw option gives you the best result if you have a touchscreen, stylus, or Wacom tablet. On a standard mouse, the result can look shaky, in which case the Type option produces a cleaner appearance. After creating your signature, click Apply and then click on the document where the signature should go. You can move and resize it before saving. Save the file with Ctrl+S.

Acrobat Reader's free tier does not support sending documents for others to sign or generating audit trails. For those features, Adobe charges a monthly subscription. If you need shared signing without a subscription, use the online tool described below instead.

Method 3: Windows Ink on Touch and Stylus Devices

If you have a Surface Pro, a drawing tablet, or any Windows device with a stylus, you can use Windows Ink to sign more naturally. In any PDF viewer that supports inking — including Edge and some third-party readers — switching to a stylus input mode and drawing directly on the signature field produces the most realistic handwritten result. The Surface Pen in particular gives you pressure sensitivity that closely mimics signing on paper.

For Surface users, the combination of Microsoft Edge and the Surface Pen is genuinely one of the fastest and most natural ways to sign documents on any platform. Open the PDF in Edge, enable the Draw tool, select a thin line weight, and sign. The result saves as a standard annotated PDF that any reader can open.

Method 4: Online Signing Tool

The built-in Windows methods all share one limitation: they are personal. Once you have signed, you save and email the file. If you need someone else to sign, they go through their own separate process and send it back. For any document that needs two or more signatures, a browser-based tool is significantly cleaner.

Sign Any PDF Free works in Edge, Chrome, or Firefox on Windows. Upload your PDF, drag signature and date fields to the right spots, and click Generate Link. You get a URL you can send to whoever needs to sign. They open the link on any device — Windows, Mac, iPhone, Android — sign with their finger or mouse, and download the completed document. No account required for either party, and the signed PDF is a standard file.

Flattening and Distributing the Signed File

After signing a PDF on Windows, it is good practice to flatten the document before sending it. Flattening merges all annotations and form fields into the base PDF layer, so the recipient cannot accidentally or intentionally modify the form fields. In Adobe Acrobat Reader's free version you cannot flatten, but you can print to PDF: go to File > Print, choose Microsoft Print to PDF as the printer, and save. The resulting file has all annotations baked in as static content.

In Edge, the saved file is already relatively flat for drawing annotations. If you are using a third-party PDF editor with a Flatten option, use that directly. Once the file is flattened, email it, upload it to OneDrive, SharePoint, Google Drive, or share it however you normally exchange documents.

Which Method Should You Use?

For a quick personal signature on a low-stakes document, Microsoft Edge and the Draw tool is the fastest option because it requires nothing extra — it is already on your Windows machine. For a more polished result that looks closer to a real signature, Adobe Acrobat Reader's Fill & Sign gives you better control. For any document that needs to go to another signer or where you want a timestamped record, Sign Any PDF Free gives you all of that without a subscription. The right choice depends on the formality of the document and whether you are the only one signing.