Yes. Kopitiam runs in your browser and is funded by ads — no export paywall, no forced watermark, no sign-up.

Do my files get uploaded?

No. The watermark is added entirely in your browser; your PDF never leaves your device.

Does the watermark hide the text underneath?

No. A watermark is a semi-transparent overlay for labeling — the content underneath stays visible and selectable. To truly remove sensitive content, use the Redact tool.

Add a watermark

Stamp text across every page — free, in your browser. Your file never leaves your device.

Drop a PDF here

or click to choose a file. Everything stays on your device.