🔒 No server uploads · No watermark

Sign PDF free

You can sign a PDF for free in DukPdf without uploading it anywhere. Draw a signature with your mouse or finger, type one with a styled font, or upload a signature image — then drop it onto the page and download. Open the Sign PDF tool to start.

Open Sign PDF →

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A common scenario

You received a contract PDF and need to add a signature before emailing it back, without paying for a subscription or creating an account on another e-sign service.

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Why privacy matters here

Most e-sign tools upload the document to their servers to record a "legal audit trail." If the contract contains sensitive terms, you can keep it local with DukPdf — see how local signing works.

✓ No watermark✓ Works offline✓ Open DevTools to verify

How to sign pdf free

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 free — questions

How do I sign a PDF free with no server uploads?

Open the Sign PDF tool, drop in your PDF, then add a signature — draw one, type one, or upload an image. Drag the signature to the right place on the page and download. The whole thing runs in your browser.

Can I sign on my phone or tablet?

Yes. DukPdf is touch-optimized, so you can draw a signature with your finger on a phone or use a stylus on a tablet. Desktop users can draw with the mouse.

Where do I place the signature on the page?

After you create the signature, it appears as a draggable element on the page. Drag it to the signature line, resize it, and click to commit. You can place as many signatures as you need across multiple pages.

Is the document uploaded to a server?

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

🔒 DukPdf — YOUR FILES NEVER LEAVE YOUR DEVICE

Ready to sign pdf free? Your files stay yours.

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