Add a watermark to a PDF
Mark a document as CONFIDENTIAL, DRAFT or with your name before sharing it. The watermark is drawn diagonally across every page.
Free forever · Runs on your device · 0 bytes uploaded
Speed depends on your device; big files on phones take longer. Slow or not working? Report it on GitHub
How to watermark PDF
- Add one PDF file.
- Type the watermark text and choose how see-through it is.
- Click “Add watermark” and download.
Also good for
- add CONFIDENTIAL to a PDF
- stamp DRAFT on PDF pages
- watermark PDF free
- add text watermark to PDF
- watermark in Hindi or any language
Private by design — and you can check
Your files are never uploaded, because there is nowhere to upload them to.
- No upload step existsFiles are read and written inside this browser tab. There is no server that could receive them.
- The browser enforces itThis page’s Content Security Policy only allows connections back to this site, which serves nothing but the app itself.
- See for yourselfOpen developer tools, watch the Network tab and run a job: no request carries your document.
- Open sourceEvery line is on GitHub, built on qpdf, pdf.js & pdf-lib.
Frequently asked questions
Are my files uploaded anywhere?
No. Fizzdoc does the work inside your browser tab, using open-source engines compiled to WebAssembly and JavaScript. Your file is read from your device, processed locally, and the result is saved straight back to your device. You can check this yourself: open your browser’s developer tools, go to the Network tab, and run a job — no request carries your file.
Can the watermark be removed?
A text watermark discourages copying but a determined person with a PDF editor can remove it. For stronger protection, also use Protect PDF.
Which characters can I use?
Letters, numbers and common symbols in Latin script. Other scripts are not supported by the standard PDF fonts.
Is Fizzdoc free?
Yes, and it stays free: no sign-up, no watermark, no daily limit and no premium tier. Fizzdoc is open source under the Apache-2.0 license, so anyone can run their own copy.
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