Open DevTools.
Watermark this PDF.
Watch nothing get sent anywhere.
Stamp your own text across every page — pick the wording, the opacity, and the angle — all inside this tab. Zero network requests after the page loads, same rule as every other tool here. Check the Network tab yourself.
Drop one PDF here or click to browse
One file at a time · stays on this device
Why trust this tool
No accounts
No signup, no email, no watermark on the watermark tool. Use it and close the tab.
No limits (for now)
Watermark as many pages as your device's memory allows. No artificial caps.
Numbering, rotating, or compressing a PDF too? All live.
Stamp page numbers onto every page, fix pages scanned sideways, or shrink the file size — same rule: everything stays local. Leave your email and we'll let you know about a Pro batch mode.
Thanks — saved locally for now, we'll be in touch once signups are live.
Stamping text without touching the page underneath
Watermark draws your text across every page using pdf-lib's native drawText, with control over opacity and rotation angle — it's additive, layered on top of the existing content rather than replacing or reflowing it, so the original page is fully intact underneath if you ever need to remove the watermark by regenerating from the source file.
Because it's drawn text rather than a burned-in image, the watermark stays crisp at any zoom level and adds only a few bytes per page to the file. One caveat that applies to this tool same as every other one here: a PDF encrypted with an open password can't be loaded at all before watermarking even starts — here's why, and what your options are.