PDF Watermark
Add a text watermark to protect your documents
Drop your files here
Click to choose a file
Supported: PDF · JPG · PNG · WebP
Drop several images at once for batch processing
Up to 50 MB per file
Stamp a tiled diagonal text watermark across every page of a PDF — CONFIDENTIAL, DRAFT, DO NOT COPY, a client name, a date — so a document can be shared without being quietly reused. JustFileKit adds the watermark in your browser, so contracts, ID scans, and unreleased material never get uploaded anywhere.
Three steps: drop the PDF in, type your watermark text and set the opacity, then process and download. The text repeats diagonally across the full page so it's visible on every screenshot and printout without burying the content underneath. Unlike tools that flatten your document into images, JustFileKit draws the watermark as a layer on top of the original page, so the text underneath stays selectable and the quality is untouched. Drag in multiple PDFs and they're processed one by one and packaged as a zip.
Frequently asked questions
- Do my files get uploaded?
- No. The watermark is applied locally in your browser and the PDF never leaves your device — which matters when the document is exactly the kind you'd want watermarked in the first place.
- Does the watermark damage the original content?
- No. It's drawn as a translucent layer over the existing page. Your text and images are preserved exactly as they were, the file isn't re-encoded, and text remains selectable and searchable.
- How light or dark can I make it?
- Opacity is adjustable from 5% to 60%. Lower is fainter. Around 20–30% is the sweet spot: clearly visible in a screenshot, still easy to read the document through it.
- Are there usage or file-size limits?
- Runs are unlimited. Files can be up to 50 MB, and batch tools accept up to 50 files at once.