Add Watermark to PDF Online — Free Custom Text Stamp
Protect or brand your PDF with a custom text watermark. Control the wording, transparency, rotation angle, font size, and colour exactly as you need.
How to watermark pdf online — 3 easy steps
- Step 1: Upload your PDF and type the watermark text (e.g. DRAFT, CONFIDENTIAL).
- Step 2: Adjust opacity, rotation, and font size.
- Step 3: Click Apply and download the watermarked PDF.
Why use FileMasterPDF to edit and annotate PDF files
- Non-destructive: the original PDF is never modified, only a new output is created.
- 100% private: editing runs in your browser — nothing is uploaded.
- No specialist software: works in any modern desktop or mobile browser.
- Instant results: changes are applied and downloadable in seconds.
- Free forever: no account, no daily limits, no watermarks.
Frequently asked questions — Watermark PDF
Can I rotate it diagonally?
Yes — set rotation to 45° for the classic diagonal stamp.
Will it appear on every page?
Yes — the watermark is applied to all pages.
Can I change the watermark colour?
Yes — pick any text colour.
Can I use an image watermark?
Use the Edit PDF tool to place an image on each page.