Signing a PDF on Windows doesn't require Adobe Acrobat — Microsoft Edge, the built-in browser and PDF viewer, handles basic signatures, and a handful of free tools cover anything more complex. Here's what works and when to use each option.
How to Sign a PDF in Microsoft Edge on Windows
Open the PDF in Microsoft Edge (right-click the file and select Open with > Microsoft Edge, or drag it into an Edge window). Click the Draw tool in the Edge PDF toolbar — the pencil icon. Use your mouse or touchpad to draw your signature on the document. Click Save to update the file with your signature.
The Edge drawing tool works for quick signatures but has no palm rejection or pressure sensitivity. The result is usable for everyday documents though it rarely looks as clean as a dedicated signature tool. For anything client-facing or legally significant, use a purpose-built option.
How to Sign a PDF on Windows Using WukongPDF
For a cleaner result, open WukongPDF's PDF Sign tool in any browser. Upload your PDF, click the signature field, and choose how to create your signature: draw it with a mouse, type your name in a signature-style font, or upload a photo of your handwritten signature. Position it on the page and download the signed file.
The typed signature option is particularly useful on Windows desktops where drawing with a mouse is awkward — a typed name rendered in a script font looks more professional than a shaky mouse-drawn signature.
Signing PDFs on a Windows Touchscreen
If you have a Windows touchscreen device — a Surface Pro, a 2-in-1 laptop in tablet mode, or a touch-enabled monitor — signing with your finger or a stylus is much more natural than using a mouse. The PDF Sign tool in WukongPDF accepts touch input, and a Surface Pen or compatible stylus gives you the most accurate, handwriting-like result.
Adobe Acrobat Reader for Windows also supports touch-based signing and has better stylus integration on Surface devices than browser-based tools — worth installing if you sign documents regularly.
Using a Scanned Signature on Windows
One of the cleanest approaches on a desktop without a touchscreen: sign a piece of white paper, photograph it with your phone, crop the signature tightly, and save it as a PNG with a white or transparent background. Upload this image as your signature in WukongPDF's PDF Sign tool and place it wherever needed in the document.
This produces a signature that looks exactly like your handwriting, is reusable across documents, and avoids the awkwardness of drawing with a mouse entirely. Store the signature image somewhere accessible so you can upload it quickly whenever you need to sign.
Is an Electronically Signed PDF Legally Valid on Windows?
Yes — electronic signatures are legally valid in the US under the ESIGN Act and in the EU under eIDAS. The operating system used to sign has no bearing on legal validity. A signature added on Windows with WukongPDF or Microsoft Edge carries the same legal weight as one added on Mac or mobile, provided the intent to sign is clear.
For documents requiring certified e-signatures with identity verification and an audit trail — certain financial contracts, legal filings, or regulated industry documents — use a platform like DocuSign or Adobe Sign rather than a manual signature tool. These provide the authentication chain that high-stakes documents require.