Protect your PDF by adding custom text or image watermarks to pages. Prevent unauthorized copying with visible or invisible watermark options.
Add Watermark in a few steps
- 1
Open Add Watermark and drag your file into the upload area, or click to browse from your device.
- 2
Adjust the available options to match what you need.
- 3
Run the tool — all processing happens locally, in your browser, in seconds.
- 4
Download the result. Your original file is never modified or uploaded.
What Add Watermark is good for
Private, sensitive documents
Contracts, IDs, medical records and financial statements should not be uploaded to a stranger's server. With Add Watermark, they never leave your device.
Working offline or on the move
On a plane, on a train, or behind a strict firewall — Add Watermark keeps working without a connection once loaded.
Quick, repeatable tasks
No accounts, no installs, no daily limits. Open the page, get the job done, and close the tab.
Frequently asked questions
- Is Add Watermark free to use?
- Yes. Add Watermark is completely free, with no sign-up, watermarks, daily quotas, or file-size caps. You can process as many files as your device can handle.
- Are my files uploaded to a server?
- No. Add Watermark runs entirely in your browser using WebAssembly. Your documents never leave your device — there are no uploads, no servers, and nothing is stored or logged. That is what makes PDF-Atlas private by architecture.
- Does Add Watermark work offline?
- Yes. After the page has loaded once, the tool keeps working without an internet connection. You can also install PDF-Atlas as a desktop app or PWA for a fully offline experience.
- Is my data safe?
- Because all processing happens locally on your machine, your files are as safe as the device they sit on. Nothing is transmitted to PDF-Atlas or any third party.