Add watermark
Stamp a text watermark across every page of your PDF — with your choice of opacity and tilt angle.
- Encrypted in transit (TLS 1.3)
- Files auto-deleted in 60 minutes
- No signup required
Run Add watermark
About Add watermark
DRAFT, CONFIDENTIAL, COPY, SAMPLE — a clear watermark signals intent. Add Watermark stamps a bold text overlay across every page of your PDF.
Tune opacity to keep your text readable underneath, tilt the angle for a classic diagonal stamp, and we'll bake it in so it appears in every viewer.
How Add watermark works
Three steps. Done in seconds.
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1
Upload your PDF
Any PDF you want watermarked.
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2
Type the watermark text
Up to 200 characters. Adjust opacity (0.05-1.0) and tilt angle (0-90 degrees).
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3
Download the watermarked PDF
Watermark is centred and stamped onto every page in Helvetica Bold.
Why Add watermark on Pixenith
Built for serious work. Free for everyday use.
Privacy first
Encrypted in transit, processed in isolated workers, deleted within 60 minutes.
Lightning fast
Most jobs finish in under 5 seconds. Heavy ones run on dedicated worker pools.
Production engine
Powered by pikepdf, Ghostscript, Tesseract OCR, ONNX models — the same tech the pros use.
Free, no signup
Generous daily limits on the free plan. Upgrade only if you need bigger files.
Related PDF tools
Often used alongside Add watermark.
- Add page numbers Insert page numbers at the position and format of your choice.
- Edit PDF Overlay text or images onto pages (front-end editor sends a list of operations).
- Protect PDF Encrypt a PDF with a password (AES-256).
- Rotate PDF Rotate every page or a specific range by 90/180/270 degrees.
- Crop PDF Crop pages by trimming margins (in PDF user units).
- Merge PDF Combine multiple PDFs into a single document in the order you choose.
Add watermark — frequently asked questions
Everything you need to know.
What opacity should I use?
0.3 is our default and works for most cases — visible without obscuring the content underneath. Use 0.1-0.2 for subtle and 0.5+ for bold.
Can I use an image as a watermark instead of text?
Image watermarks aren't on this endpoint yet — use Edit PDF with an image edit operation. Or contact us for the roadmap.
Will the watermark print?
Yes — it's baked into the page content, so it prints exactly as displayed.
Can I remove a watermark someone else added?
Only if it's in a separate annotation layer. Baked-in watermarks (like the ones Pixenith produces) become part of the page and can't be removed.
Why is the watermark always centred?
Centred + tilted gives the classic DRAFT-style coverage. For watermarks in other positions, use Edit PDF with a custom text edit operation.