Is my PDF uploaded to add a watermark?

No. The watermark is drawn onto your PDF entirely in your browser — your file is never uploaded.

Can I watermark every page at once?

Yes. The text is stamped across all pages, either as a single diagonal mark or a repeating tiled pattern, with adjustable colour.

Will the watermark work with non-English text?

Yes. AttachKit loads a Unicode font so accented and non-Latin characters render correctly instead of breaking.

Yes — unlimited, no account, and no AttachKit branding added to your file.

Add a watermark to a PDF

Stamp DRAFT, CONFIDENTIAL, or any text across every page. It all happens in your browser — unlike most online watermark tools, your file is never uploaded to a server.

100% local. The PDF never leaves this device — open DevTools and watch.
Diagonal or tiled. Pick the text, layout and color, then preview before you download.

Drop a PDF here

or tap to choose a file

Private, in-browser PDF watermarks

Stamp DRAFT, CONFIDENTIAL or any text across every page — all in your browser, with no upload.

Nothing is uploaded

The whole thing runs in your browser — open your network tab and watch: your file never leaves your device. Most online tools round-trip your document through their servers.

Diagonal or tiled

One big 45° mark or a repeating tile, in grey, red or blue, with a live preview before you download.

Free, no account

No watermark from us on top of yours, no sign-up, no page limit.