How to Watermark a PDF Online
Adding a watermark should let you see the result as you set it up. This free Watermark PDF tool shows your first page live, with the watermark drawn on top exactly as it will be stamped — so you can tune the text, position, colour and opacity, then apply it to every page or just the ones you choose. It all runs in your browser, so your file is never uploaded.
Add your PDF
Drop a PDF or click to browse. Your first page appears as a live preview.
Design the watermark
Type the text, pick a position, colour, opacity and size — watch it update live.
Apply and download
Stamp all pages or just the ones you pick, then save your watermarked PDF.
Why Watermark PDFs Here
See it live on the page
The watermark is drawn on your real first page as you type, so there are no surprises when you save.
Five positions
Diagonal, centre, top, bottom, or tiled across the whole page — pick what suits the document.
Any colour and opacity
Choose a preset or custom colour and set the transparency so text stays readable underneath.
One-click presets
CONFIDENTIAL, DRAFT, COPY and more are a single tap away, or type your own.
Choose your pages
Stamp the whole document, or select only the pages that need a watermark.
Private and free
Everything runs in your browser with no upload, no account, no daily cap and no watermark from us.
Free and 100% Private
Watermarking usually means marking private or draft documents, so this tool keeps everything on your device. Your file is never uploaded, stored or seen by anyone. It's completely free, with no account, no daily cap and no extra stamp added by us.
Want to protect a document further? Combine files with Merge PDF, shrink the result with Compress PDF, or turn pages upright with Rotate PDF.
Watermark PDF on Any Device
How to watermark a PDF on Windows
Open this page in any browser, add your PDF, type your watermark text, and click Add watermark. You get a stamped PDF to save — no Acrobat needed.
How to watermark a PDF on Mac
Open the page in Safari or Chrome, add the PDF, design the watermark, and download. Everything runs locally.
How to watermark a PDF on iPhone or Android
Open this page in your phone's browser, pick the PDF from Files, set the watermark, and save the result.
How to add a CONFIDENTIAL watermark
Type CONFIDENTIAL or tap the preset, choose a diagonal position and a light opacity, then apply it to every page.
How to watermark only some pages
Switch Apply to from All pages to Choose pages, then tap the page thumbnails you want to stamp.
How to make the watermark lighter
Lower the opacity slider so the text sits softly behind your content and stays easy to read.
Frequently Asked Questions
How do I watermark a PDF for free?
Add a PDF above, type your watermark text, set the look, and click Add watermark. It's completely free, with no signup and no watermark added by us.
Are my PDFs uploaded to a server?
No. The watermark is added right inside your browser, so your file never leaves your device. Nothing is uploaded, stored or seen by anyone.
Can I see the watermark before saving?
Yes. Your first page is shown live with the watermark drawn on top, so you can fine-tune it before applying.
Where can the watermark go?
Choose diagonal, centre, top, bottom, or tiled across the whole page — five positions in total.
Can I change the colour and opacity?
Yes. Pick a preset or custom colour and set the opacity so the text stays readable underneath.
Can I use my own text?
Absolutely. Type any text up to 60 characters, or tap a preset like CONFIDENTIAL or DRAFT.
Can I watermark only certain pages?
Yes. Switch to Choose pages and tap the page thumbnails you want to stamp.
Does it reduce quality?
No. The watermark is drawn as crisp text directly onto the pages; the rest of the content is untouched.
Is there a file size limit?
There is no fixed limit. Very large PDFs just take a little longer since everything runs on your device.
Can I watermark a password-protected PDF?
You'll need to remove the password first, since encrypted PDFs can't be edited until they're unlocked.
Is this Watermark PDF tool really free?
Completely free, with no account, no watermark from us, no limit and no premium wall.
100% private — your PDF is watermarked right here in your browser and never uploaded to any server.
Last updated: July 2026 · FlipMyFormat Watermark PDF
Written and maintained by the FlipMyFormat team