🔒 No server uploads · No watermark

Sign PDF online

DukPdf's Sign PDF tool runs in your browser, so you can add a signature to any PDF without installing software. Draw a signature, type one, or upload a signature image — then place it on the page, resize it, and download. No server uploads, no watermark.

Open Sign PDF →

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A common scenario

You need to add a signed date to a PDF form before emailing it back, and you do not want to print, sign, and re-scan the document.

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Why privacy matters here

Cloud e-sign services record every signature in an audit trail on their server. DukPdf's browser-based signing leaves the file on your device — read more on our private PDF editor page.

✓ No watermark✓ Works offline✓ Open DevTools to verify

How to sign pdf online

Open the tool and add your file

Click the link below to open the tool in your browser. Drop in your PDF or click to select it. The file is read locally on your device.

Configure the operation

Pick a quality preset, page range, signature style, or whatever the tool needs. Every option runs in your browser — nothing is sent to a server.

Download the result

Click the action button. The result saves to your device. The original file is unchanged unless the tool explicitly modifies it.

Every step runs in your browser. No server uploads, no waiting.

Sign PDF online — questions

Can I sign a PDF online without creating an account?

Yes. DukPdf requires no account and no email. Open the Sign PDF tool, drop in your file, add your signature, and download.

What kinds of signatures can I add?

Three: draw a signature with your mouse or finger, type a signature and pick from styled fonts, or upload a transparent PNG of a handwritten signature. All three embed cleanly into the PDF.

Can I add initials, the date, or a printed name?

Yes. The same tool lets you add text — initials, the date, a printed name, or a checkbox — anywhere on the page. Each element is draggable and resizable.

Are the files uploaded to a server?

No. The whole signing flow runs in your browser. Open DevTools → Network tab and you will see zero upload requests while signing.

🔒 DukPdf — YOUR FILES NEVER LEAVE YOUR DEVICE

Ready to sign pdf online? Your files stay yours.

No server uploads. No watermark. Open the tool, drop your file, and download the result.