How to sign a PDF on Windows

Why Windows makes signing harder than it should be

macOS ships with Preview, which can place a stored signature on a PDF. Windows has no equivalent. Microsoft Edge, the default PDF viewer on Windows 10 and 11, includes a Draw tool intended for marking up documents — but it produces freehand ink annotations, not a proper signature. There is no typed-signature option, no way to upload a clean image of your handwriting, and no reliable flattening, so a recipient opening the file in another reader may find the ink misaligned or editable.

That gap is why most Windows users are pushed toward installing Adobe Acrobat Reader. It works, but it is a 1–2 GB download, it prompts you to sign in with an Adobe account, and its Fill & Sign feature is buried in a feature-heavy interface built for far more than adding one signature. For a single document, that is a lot of overhead.

A browser-based signer closes the gap directly. It runs in the browser already on your PC, gives you all three signature styles, and outputs a flattened, standard PDF — without installing anything or creating an account.

Edge Draw tool vs a dedicated signer

Both let you put ink on a PDF in Windows without extra software, but the results are different in ways that matter when you send the document to someone else:

• >Edge Draw: freehand pen only — no typed or uploaded signature, no precise sizing, and the mark is saved as an annotation rather than flattened into the page.
• >Browser signer: draw, type, or upload a signature; drag and resize it precisely onto the line; output is flattened so it cannot be moved or deleted afterward.
• >Both: free, no account, and the file is processed on your own PC rather than uploaded to a server.

No Microsoft or Adobe account required

Signing a single PDF should not require creating an account anywhere. A browser signer asks for nothing — no Microsoft account, no Adobe ID, no email address. You open the page, upload the file, sign, and download.

This matters on shared or managed Windows machines too. On a work laptop where you cannot install software, or a family PC where you would rather not sign into Adobe, the browser approach sidesteps both problems. The only requirement is a modern browser, which every Windows PC already has.

Drawing a clean signature with a mouse

A signature drawn with a mouse tends to look shaky, because a mouse is a poor tool for the fine, fast motion of signing. Two techniques help. First, draw slowly and deliberately rather than trying to replicate your normal signing speed. Second, draw larger than the final size you need, then scale the signature down once it is placed on the page — reducing the size hides small wobbles.

If your Windows device has a touchscreen — a Surface, a 2-in-1, or a touch-enabled laptop — switch to drawing with a finger or a stylus for a far more natural result. A Surface Pen in particular produces a signature close to pen on paper. If you cannot get a drawn result you are happy with, the typed option renders your name in a handwriting font with perfect consistency every time.

Signing a PDF from Outlook or a download

If the PDF arrived as an Outlook attachment, save it to your PC first — right-click the attachment and choose Save As, or save it to OneDrive — then open the signer and pick it from that location. If you opened the PDF from a website and it downloaded automatically, it is in your Downloads folder; drag it straight from File Explorer into the upload area.

After signing, the completed PDF lands in Downloads as a standard file. Attach it to your email reply or upload it to whatever portal requested it. There is no special format and nothing the recipient needs to install to open it.

Your document never leaves your PC

The signer processes the PDF locally in your browser using WebAssembly, so the file is never uploaded to a server. On Windows, where the same machine is often used for work contracts, tax forms, and personal paperwork, keeping the document on the device removes the upload-and-store risk that comes with cloud signing services.

Once you download the signed file, it exists only where you saved it. There is no server-side copy to expire, be retained, or be exposed in a breach.

Works in Edge, Chrome, Firefox, and Brave

Because the signer is a standard web application, it works in every major browser on Windows 10 and Windows 11 — Microsoft Edge, Google Chrome, Mozilla Firefox, and Brave — with no extension or plugin. There is nothing to configure: open the page in whichever browser you prefer and the full signing flow is available.

If you usually read PDFs in Edge, you can keep doing so and only switch to the signer when you actually need to add a signature, then return the finished file through your normal email or upload workflow.