Watermark PDF
Stamp a text watermark on every page of a PDF in your browser, with adjustable opacity, font size, rotation angle, and color, no upload needed.
Watermark PDF — Add a repeating text watermark — like CONFIDENTIAL or DRAFT — across every page of a PDF. Choose the opacity, font size, rotation angle, and color, then download the stamped file. Everything runs with pdf-lib entirely in your browser, so the document is never uploaded.
What is Watermark PDF?
Watermark PDF is a free, browser-based tool that stamps a single line of text diagonally across the center of every page of a PDF. It is used to mark documents as CONFIDENTIAL, DRAFT, SAMPLE, or COPY, to add a name or notice, or to brand reports and contracts before sharing them. You control the watermark text, its opacity, font size, rotation angle, and color, and a clickable first-page preview shows the original before you stamp it. The watermark is drawn with the standard Helvetica font, so it supports Latin (ASCII) text only — CJK and other non-Latin scripts are not rendered.
How to use Watermark PDF
- Drag and drop a PDF onto the dropzone (or click to choose a file). The tool loads it and shows the page count plus a first-page preview you can click to enlarge.
- Type your watermark text (for example CONFIDENTIAL) in the Watermark text field. Use Latin characters — non-Latin text like Chinese, Japanese, or Korean is skipped.
- Open Settings to adjust the opacity (0–100%), font size, rotation angle in degrees, and color of the watermark.
- The preview and output rebuild as you type and tweak settings; the watermark is drawn centered and rotated on every page.
- Click Download to save the stamped PDF as <name>-watermarked.pdf.
Examples
Mark a contract as CONFIDENTIAL
Drop contract.pdf, type CONFIDENTIAL, set opacity to 20% and rotation to 45°, and download. Every page gets a faint gray diagonal CONFIDENTIAL stamp across its center, saved as contract-watermarked.pdf.
Add a bold DRAFT stamp
For a 12-page report, type DRAFT, raise the font size to 72 and opacity to 35%, and pick a red color. All 12 pages receive the same large red DRAFT watermark rotated 45 degrees.
Horizontal SAMPLE label
Set rotation to 0 to lay the text flat instead of diagonal. Typing SAMPLE produces a level watermark centered on each page — useful for catalog or proof pages.
Frequently asked questions
- Is my PDF uploaded to a server?
- No. Everything runs 100% client-side in your browser using pdf-lib. Your document is read and stamped locally and is never uploaded, so it stays private even for confidential files.
- Can I use Chinese, Japanese, Korean, or other non-Latin text?
- No. The watermark is drawn with the standard Helvetica font, which only covers Latin (ASCII) characters. Non-Latin characters are skipped, so the watermark text must use Latin letters, digits, and basic punctuation.
- Which pages get the watermark?
- Every page. The same text is stamped, centered and rotated, on all pages of the document at once. There is no per-page selection.
- What can I adjust?
- The watermark text, its opacity (0–100%), font size, rotation angle in degrees (0 lays it flat, 45 makes it diagonal), and color. The preview and download update as you change these.
- Can the watermark be removed later?
- The text is drawn into the page content, so it isn't a simple metadata tag — but like most printed-on watermarks it isn't tamper-proof and could be edited with PDF software. Use it as a notice, not as hard security.
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