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Watermark, compress, merge, rotate and add page numbers to PDFs in a single workflow - 100% browser-based.
What is watermark pdf online free?
Watermarking PDFs is essential for marking drafts, protecting confidential documents, stamping copyright notices, and branding shared reports. Vakru embeds your watermark text diagonally across every page using pdf-lib - entirely in your browser. Adjust opacity so the watermark is visible without obscuring content. Free, no signup.
How it works
Mark your PDF as Draft, Confidential or Approved with custom text or image watermarks - applied to every page or just selected pages.
Upload your PDF
Drop a PDF into the watermarker. The document is processed locally - never uploaded to any server.
Add a text or image watermark
Type your watermark text (Draft, Confidential, etc.) and pick a font - or upload a transparent PNG logo.
Choose pages and style
Apply to every page or a page range. Set position, opacity, rotation and colour with live preview.
Download the watermarked PDF
Save the protected PDF instantly - the watermark is baked into every selected page.
💡 Pro Tips
Use 20-30% opacity for subtle branding
A light watermark deters unauthorized use without making the document hard to read - ideal for client proposals and reports.
CONFIDENTIAL and DRAFT are the most common
Stamp internal documents before distributing - the watermark makes it immediately clear the document is not for public release.
Use your website URL for document traceability
Adding your URL as a watermark means any leaked copy can be traced back to its origin.
Combine with page numbers for professional output
Use the Add Page Numbers tool after watermarking for fully branded, numbered documents.
Frequently Asked Questions