Add Watermark to PDF
Stamp a text watermark on your PDF right in the browser. Write any wording, then choose a diagonal tiled layout that covers the whole page or a single centered mark, and tune the font size, color, opacity and rotation. Apply it to every page, the first page only or a custom page range. The watermark is drawn as real vector text, so it stays sharp when printed, and your file is read on your device and never uploaded.
Add your PDF file
PDF onlyDrop a PDF here or click to browse
One file at a time. The page count is read as soon as it is added
Result
Add a PDF to startYour watermarked PDF will appear here
The watermark is drawn as vector text on top of each selected page, so the original content underneath is left untouched, stays selectable and scales cleanly with zoom or print.
How to add a watermark to a PDF
Add your PDF
Drop one PDF into the tool or click to browse. The page count is read on your device, so nothing is uploaded.
Set the watermark
Type the watermark text, choose a diagonal tiled or single centered layout, then tune the font size, color, opacity and rotation to taste.
Add and download
Click Add watermark, check the output size, then download the new PDF with the watermark applied.
Why add a watermark with Aihangsoft
Real text, not a sticker
The mark is drawn as vector text on the page, so it stays razor sharp when the PDF is zoomed or printed and never breaks into pixels.
Private by design
Your PDF is opened and stamped in your browser with pdf-lib. Contracts, drafts and IDs are never uploaded, stored or queued on a server.
Full control
Set the wording, layout, size, color, opacity, rotation and the exact pages you want in one place, with no account and no export limit.
Built for everyday documents
Mark a document confidential
Stamp CONFIDENTIAL, DRAFT or INTERNAL across every page in one pass, so a shared file is clearly labelled before it leaves your hands.
Use case: legal drafts, HR files, internal reportsProtect a portfolio or preview
Add a light branded watermark to sample pages before sending a proposal or a design preview to a client or a prospect.
Use case: proposals, portfolios, previewsBrand every page
Repeat a company name or a URL across the whole document so screenshots, handouts and printed copies always carry the source.
Use case: branding, handouts, course materialWatermark only what matters
Apply the mark to the first page or to a custom range, so a signed cover or a title page stays clean while the rest of the file is labelled.
Use case: contracts, invoices, manuals