Watermark a PDF in your browser — stamp your text on every page at the opacity you choose. The file is processed entirely on your device, never uploaded. Runs entirely in your browser — your numbers never leave this device.
No PDF yet. Choose one above — the watermark text is stamped onto every page of the copy you download; your original file is never changed.
Your file is processed entirely in your browser and never uploaded: it is opened in memory on your own device, your watermark text is drawn onto each page, and the stamped file is offered back as a download. Nothing is sent to a server at any stage and the tool works offline once loaded. As with Add Page Numbers, the watermark is drawn over the existing page content, which is not itself re-rendered or re-encoded — the text, images and vectors underneath keep their original form.
You supply three things: the text (DRAFT, CONFIDENTIAL, your name or a notice), the opacity, and the placement — a single centred stamp, typically angled across the page, or a tiled mode that repeats the text across the whole page so no crop of the page escapes it. Opacity is the working trade-off: low opacity (around a fifth to a third solid) keeps the document readable while marking every page; full opacity is a label, not a watermark, and will fight the text underneath wherever they overlap.
What a watermark is — and is not — is stated plainly: it is a visible mark drawn into the downloaded file, suitable for signalling status and discouraging casual redistribution. It is not security. It does not encrypt the file, restrict opening or printing, or prevent a determined person from working to remove drawn content, and this tool does not claim otherwise. For a document that must actually be restricted, use a password in a full PDF application; for a document that must be marked, this is the tool.
No. The file is opened, stamped and downloaded entirely in your browser — it never leaves your device, is never stored or logged, and the tool works offline.
A watermark is drawn content, marked visibly rather than locked in. Removing deliberately drawn content is work, and a tiled watermark makes casual removal impractical — but a watermark is not encryption or access control, and this page does not present it as such. Keep your unstamped original; the mark is permanent for practical purposes in the copy you download.
Around 15–30% for a working document that must stay readable: the mark is unmistakable on every page and the text underneath is unaffected in practice. Higher values suit single-word status labels on otherwise sparse pages; full opacity will obscure whatever it overlaps.
The pages gain drawn text; their existing content is not re-rendered or re-encoded, and page count, sizes and rotations are unchanged. The output has exactly as many pages as the input.
Single mode places one stamp, usually centred and angled, on each page — the classic DRAFT look. Tiled mode repeats the text across the full page, so a cropped excerpt still carries the mark. Tiled is the choice when pages may be shared piecemeal.
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