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PDF Watermark

Add a text or image watermark across every page, with a live preview.

Runs in your browserNo sign-up required
Upload a PDF

Drag & drop a PDF, or click to selectTap to choose a PDF

See It Before You Generate It

A watermark that's too bold ruins a document; one that's too faint is pointless. This tool renders a live preview of your actual first page with the watermark overlaid at your current settings, so you can dial in opacity, rotation, and size before committing to generating the final file.

How to Use This Tool

  1. 1Upload a PDFThe first page renders as a live preview canvas.
  2. 2Choose text or imageA diagonal text watermark like "CONFIDENTIAL," or your own logo/image.
  3. 3Adjust opacity, rotation, and sizeThe preview updates instantly so you can see the effect before generating.
  4. 4Apply & downloadThe watermark is added to every page of the document.

Good to Know

  • The preview approximates the final look using the actual first page of your PDF, so there's no guessing before you generate the real file.
  • A lower opacity (15-30%) keeps a watermark visible without obscuring the underlying content — a good default for most documents.
  • Image watermarks support PNG (with transparency) and JPEG.
  • The watermark is applied at generation time, directly with pdf-lib — your document is never uploaded.

Frequently Asked Questions

Will the watermark cover important content?

It's centered with adjustable opacity and size, so you can tune it to sit behind text without making the page unreadable — check the live preview before generating.

Can I remove a watermark added by this tool later?

Not automatically — the watermark becomes a permanent part of the new PDF's content, the same as with any watermarking tool. Keep your original file if you might need an unwatermarked copy.

Does this work for image-heavy or scanned PDFs?

Yes — the watermark is drawn as a new layer on top of each page regardless of what the page already contains.

Is my logo or document uploaded anywhere?

No — both your PDF and watermark image are processed entirely in your browser.