// how the watermark works & tips
The watermark text is drawn directly onto every page of your PDF using the built-in Helvetica font. The live preview shows page one exactly as it will export, so you can dial in the look before committing.
- Centered places one large stamp diagonally across the middle of each page, the classic "DRAFT" look.
- Tiled repeats the text in a grid so it covers the whole page, which is harder to crop out and reads as a security pattern.
- Opacity low (15–25%) keeps the underlying text readable; raise it for a bolder, more obvious mark.
- Angle defaults to 45°, the usual diagonal. Set it to 0 for a horizontal banner.
Privacy: your PDF is read into memory in the browser, stamped with pdf-lib, and rendered for preview with pdf.js. Nothing is uploaded; close the tab and the file is gone. The two libraries are fetched once from a CDN.
Related: need to combine several scans into one file first? The Merge PDF tool joins them, and Organize PDF lets you reorder or delete pages before you watermark.
// a free, browser-only tool by Tiempo Software, built in Omaha, Nebraska. Runs entirely in your browser; nothing you enter is uploaded. see all tools.