How to add watermark to PDF?

Open your PDF locally, choose text or image watermark, set opacity and placement on the grid, and download. pdf-lib processes in a Web Worker — your file never uploads.

How to watermark a PDF online safely?

Use Convertify4u — a secure watermark PDF online experience where bytes stay on your device. No server storage, no auto-deletion timers needed.

Can I use text and image watermarks?

Yes. Add text watermark to PDF for labels like CONFIDENTIAL or DRAFT, or add logo watermark to PDF with a transparent PNG. Both support opacity, rotation, and grid placement.

Does my file upload to your servers?

No. Processing is 100% local in a browser Web Worker. Your PDF bytes never leave your device — there is nothing for us to store.

What opacity should I use for a watermark?

Light overlays (15–30% opacity) keep text readable; heavier stamps (40–60%) deter screenshots. Adjust in the tool and preview before download.

Can I watermark PDF online for free?

Yes. Standard-sized single PDFs watermark free with no account. Massive 100MB+ files and batch jobs require Premium via Lemon Squeezy.

Is there a file size limit for free watermarking?

Free tier handles everyday single-file PDFs in-browser. PDFs over 100MB and bulk watermark PDF workflows need Premium for reliable memory headroom.

Canonical Watermark PDF Tool

Watermark PDF Online — PDF Watermark Creator

Need to watermark PDF online without sending files to a server? Our pdf watermark creator runs entirely in your browser — add watermark PDF text or logos with opacity, rotation, and placement grid while your watermark PDF document never leaves your device. Insert watermark in PDF pages locally with zero-knowledge processing: your confidential bytes stay on your machine. Basic single-file watermarking is free and instant.

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How it works

1
Open your PDF locally
Select a PDF from your device. A pdf-lib Web Worker loads it in Tier 1 local processing — zero server upload, so you can apply watermark to PDF files with absolute privacy.
2
Configure text or image watermark
Choose text or logo overlay, set opacity and rotation, and pick placement on the grid across all pages. Our pdf watermark tool stamps every page in-browser — no cloud processing.
3
Download the watermarked PDF
Export your file instantly. Basic add watermark PDF jobs are free with no signup; batch watermark PDF and massive 100MB+ files require Premium via Lemon Squeezy.

Use cases

Mark drafts before review

Add watermark to PDF drafts with DRAFT labels — watermark PDF documents so reviewers know the file is not final.

Brand client deliverables

Apply watermark to PDF proposals with your company name — a pdf watermark creator that keeps branding local and private.

Protect confidential reports

Insert watermark in PDF quarterly reports with CONFIDENTIAL text before internal circulation.

Share preview copies safely

Learn how to watermark a PDF online once, save a stamped copy, and distribute without full-resolution leaks.

Problems we solve

Upload-based tools leak files

Most online watermark services send your PDF to a remote server. Ours processes 100% locally — your file never leaves the device.

Desktop subscriptions for simple stamps

Skip expensive Acrobat plans for a one-time watermark. This pdf watermark tool runs free in any modern browser.

Rasterized quality loss

Print-to-PDF hacks degrade text. pdf-lib applies vector-friendly overlays — add watermark without losing quality on standard jobs.

Specialized Watermark PDF guides

Trust & privacy

100% local browser processing

pdf-lib Web Worker handles watermark PDF jobs entirely on your machine — no cloud upload, no retention risk.

Text or image watermarks

Add text watermark to PDF or upload a PNG logo — opacity, rotation, and placement grid across all pages.

Free basic watermarking

Everyday watermark PDF tasks are free with no signup. Premium unlocks batch jobs and 100MB+ massive files via Lemon Squeezy.