100% free · runs in your browser
Stamp your PDF, your way.
Set your text, pick a color and layout — including a professional diagonal tile — and watch the preview update live before you download.
Diagonal tile layout
Repeats your watermark diagonally across the whole page — the look most official documents use.
Full color control
Pick any color with the color picker — not just a fixed red.
Accurate live preview
What you see on page 1 is calculated the same way as the final PDF — no surprises after download.
All pages or just one
Watermark the whole document, or just the cover page — your choice.
Stays on your device
Your PDF is processed locally in your browser. We never upload or store your documents.
Genuinely free
No signup, no extra watermark on top of yours, no subscription.
Add a watermark that actually looks intentional
A watermark should look like it belongs on the page — properly sized, correctly centered, and consistent from the preview to the final download. Our Watermark PDF tool gives you real control: font, size, color and opacity, five layout styles including a professional diagonal tile, and a live preview that's calculated the same way as the actual export, so what you see is genuinely what you get.
Layout styles explained
- Center — one watermark, dead center of the page.
- Top-Left / Bottom-Right — a single, unobtrusive mark in a corner.
- Diagonal — one large watermark angled across the middle of the page.
- Repeat Grid — the watermark tiled upright across the whole page.
- Diagonal Tile — the classic official-document look: your text repeated diagonally, edge to edge.
Where this helps
Confidential draftsMark a document as DRAFT or CONFIDENTIAL before sharing it.
Copyright protectionAdd your name or company across a document to discourage misuse.
Sample documentsStamp SAMPLE across a preview version before sending the final file.
BrandingAdd your company name as a subtle repeated watermark on reports.
Tips for a clean result
- Lower opacity (20–35%) keeps a watermark visible without overwhelming the content underneath.
- Diagonal Tile is the most tamper-resistant style since it repeats across the entire page.
- Use "First page only" for a cover-page stamp like DRAFT without marking every page.
- Check the live preview before downloading — it matches the final PDF exactly.
Frequently asked questions
Can I choose my own color for the watermark?Yes — use the color picker to set any color you like, not just a fixed default.
What's the difference between Diagonal and Diagonal Tile?Diagonal places one large angled watermark in the middle of the page; Diagonal Tile repeats it edge to edge, which is the look most official watermarked documents use.
Can I watermark just the first page?Yes — choose "First page only" if you just want to stamp a cover page rather than every page.
Does the preview match the final PDF?Yes — the same text-width calculation is used for both, so the preview on page 1 closely matches what downloads.
Can this tool remove an existing watermark from my PDF?No — reliably detecting and removing a watermark that's already baked into a PDF isn't something a lightweight browser tool can do accurately, so we focus on doing the "add" side really well instead of offering a removal feature that wouldn't actually work.
Is my document safe?Yes — everything happens locally in your browser. Your PDF is never uploaded to a server.
Do I need to install anything?No, it's a browser-based tool — nothing to download or install on your computer.