Your files stay on your device • No upload to server • No account required

Add Watermark to PDF Online Free

Add semi-transparent text watermarks to every page of your PDF. Type your watermark text — such as CONFIDENTIAL, DRAFT, or Preview Only — and the tool applies it diagonally across each page.

How to add a watermark to a PDF

  1. 1Upload the PDF file you want to watermark.
  2. 2Enter the watermark text you want to display.
  3. 3Click Generate file to apply the watermark.
  4. 4Download your watermarked PDF.

Why watermark your PDFs

Protect Confidentiality

Mark sensitive documents to discourage unauthorized sharing.

Identify Draft Versions

Clearly label draft documents to avoid confusion with final versions.

Brand Your Documents

Add your company name or logo as a watermark to every page.

Preview Purposes

Mark preview copies so recipients know they have a non-final version.

100% Private — No Upload, No Account

Your PDF never leaves your device. All processing is done locally in your browser using WebAssembly — no files are uploaded to any server, no account or sign-up is required, and after the page loads the tool works even without internet. Perfect for sensitive documents like contracts, invoices, and IDs.

Frequently Asked Questions

Can I remove a watermark after adding it?

The watermark is burned into the PDF pages. Keep an unwatermarked backup.

Is the watermark visible on screen and in print?

Yes. Semi-transparent but visible both on screen and when printed.

Can I use multi-line watermark text?

Currently, the tool supports single-line text watermarks.

Are my PDF files uploaded to a server?

No. All processing happens entirely in your browser using WebAssembly. Your files never leave your device — there are no uploads to any server. After the page loads, the tool works even without an internet connection.

Is this tool free to use?

Yes, completely free. There are no hidden charges, no file size limits, no watermarks on output files, and no registration or account required. Use it as much as you need.

Can I add a watermark on a mobile phone or tablet?

Yes. The tool works in any modern browser on mobile, tablet, or desktop. The interface is responsive and works with touch input. No app download needed.

Will the PDF quality change after processing?

No. The tool preserves your original PDF content and quality exactly. Only the changes you requested are applied — text, images, and layout remain unchanged.

Can I add a watermark if the PDF is password-protected or encrypted?

No. Password-protected or encrypted PDFs cannot be processed. You need to remove the protection first (using a tool like Adobe Acrobat or a free online unlocker), then upload the unprotected file.