pdfcdf
All tools

How to sign a PDF on Windows

Windows can open a PDF in Edge and print to PDF, and that's about the extent of it. Anything structural means installing software — and most free Windows PDF editors bundle extras you don't want or watermark the output. Running the job in the browser you already have open avoids installers, admin rights and watermarks entirely.

Signing is the classic mobile job — a contract arrives by email and you need it signed and returned without finding a printer, a scanner and a pen.

Open Sign PDF →

Step by step on Windows

  1. 1Open the Sign PDF tool and upload your document.
  2. 2Draw or type your signature in the side panel.
  3. 3Click on the page to place it, drag to position, then download the signed PDF.

Click to browse and use the standard Windows file dialog, or drag the PDF from File Explorer or your desktop directly onto the page.

Where the finished file is saved on Windows

Edge and Chrome save to your Downloads folder and show the file in the downloads flyout at the top-right. Open File Explorer → Downloads to find it later, or drag it from the flyout straight into an email.

What Windows can’t do on its own

Windows has no built-in PDF editor. Edge can view and annotate, and 'Microsoft Print to PDF' can create one — but merging, splitting, page editing and OCR all require third-party software, which on a managed or work PC you may not even be allowed to install.

FAQ

Do I need admin rights or an installer for this?
No. Nothing is installed, so it works on locked-down work and school PCs where you can't install software.
Will the finished PDF have a watermark?
No. Many free Windows PDF utilities stamp their logo on the output unless you pay — this doesn't add anything to your document.
Is a drawn signature legally valid?
In many places a simple electronic signature is accepted for everyday agreements. For legally-certified digital signatures with a certificate, use a dedicated e-signature service.
Can I place my signature on any page?
Yes — click anywhere on any page to drop your signature, then drag and resize it, and add it in as many spots as you need.
Is pdfcdf free to use?
Yes. Every tool on pdfcdf is completely free, with no account, no watermarks, and no limits on how many files you process.
Are my files safe? Do they get uploaded?
Your files never leave your device. Every tool runs entirely in your browser, so your documents are processed locally and are never uploaded to a server or seen by anyone.
Do I need to create an account or sign up?
No. pdfcdf works instantly with no sign-up, no email, and no software to install — just open the tool and go.
Does it work on mobile phones and tablets?
Yes. pdfcdf runs in any modern browser on phones, tablets, Mac, Windows and Linux — nothing to download.

Ready to sign a PDF on your Windows?

Open Sign PDF →

Same tool, other devices

Sign a PDF on iPhoneSign a PDF on AndroidSign a PDF on MacSign a PDF on ChromebookSign a PDF on iPad

Related tools

Fill & SignWatermarkFlatten PDF