A watermark protects your work and your privacy. Whether you're a freelancer marking a proposal as DRAFT, a student writing "Submitted to XYZ only" across an ID copy, or a business stamping CONFIDENTIAL on a contract, a clear diagonal watermark tells everyone how a document should be used. GoPDFGo's Watermark PDF tool stamps your chosen text across every page — you choose the position (diagonal, tiled, footer, or center) plus the size, color, and opacity, so it stays visible without hiding the content. It runs entirely in your browser, so your sensitive documents never touch a server. Add your watermark and download in seconds, with no signup and no watermark from us.
A real example: stamping an ID copy before you send it
Common problems and how to fix them
The watermark is too dark and makes the text underneath hard to read.
Lower the opacity, drop to a smaller size, or switch to the footer position. Gray sits lighter on the page than red or blue, and the live preview shows the effect before you download.
You are worried someone could crop the watermark off a corner of the page.
Use the tiled position so the text repeats across the whole sheet, or diagonal so it runs through the middle. Both leave no clean margin to trim away without cutting into the content.
You already downloaded the file and now need it without the watermark, or want to change the text.
The mark is baked into the page content and cannot be lifted out, so redo it from your original PDF. Always keep an unstamped copy before you apply a watermark.
Why Watermark Your PDFs?
Custom Text Stamp
Type anything — CONFIDENTIAL, DRAFT, your name, a website, or 'For KYC use only'. The text is applied across every page in one go.
Full Control: Opacity, Size, Color & Position
Tune the opacity (light or bold), pick a size (small, normal, or large), choose a color (gray, red, or blue), and set the position — a diagonal stamp, a repeating tiled pattern, a footer line, or a single center mark. A live preview of page 1 updates instantly as you adjust, so you see exactly how it will look before you download.
Secure & Local
Stamping a confidential agreement or an ID copy? It's safe. The watermark is applied on your own device — your file is never uploaded anywhere.
Best Times to Add a Watermark
Protecting ID Copies: Write 'Submitted to [Company] only' across a copy of your Aadhaar, PAN, or license so it can't be misused elsewhere.
Marking Drafts: Freelancers and teams can stamp DRAFT or SAMPLE on proposals and designs before they're finalized.
Confidential Documents: Clearly mark contracts, reports, and financial statements as CONFIDENTIAL before sharing.
Branding: Add your name or website across a portfolio or quotation to reinforce ownership.
How to Watermark a PDF
Upload PDF: Drop your document in — it loads instantly and privately.
Enter Watermark Text: Type the text you want stamped on every page.
Style It: Set the position (diagonal, tiled, footer, or center), size, color, and opacity to get the exact look you want.
Apply & Download: Click to stamp every page and download your watermarked PDF.
Watermark Tool FAQs
Will the watermark cover my text?
No. The watermark is semi-transparent, so your original content stays fully readable underneath it — and you can lower the opacity or change the position and size to keep everything clear.
Is the watermark added to every page?
Yes. Your chosen text is stamped consistently across all pages of the document in a single click.
Can the watermark be removed later?
The watermark is baked into the page content, so it is permanent. Keep a copy of your original file if you'll need an un-watermarked version.
Is it safe for confidential files?
Yes. Watermarking happens entirely in your browser. Your file is never uploaded, so even sensitive documents stay private.