2026-09-08
Stamping "DRAFT" or "CONFIDENTIAL" diagonally across a document is a small task, but the tools that do it vary a lot in how much control they give you over opacity, rotation angle, and size before the watermark either disappears into the background or overwhelms the page.
| Tool | Opacity control | Rotation angle control | Size control | Runs fully in your browser |
|---|---|---|---|---|
| iLoveDevTools | Yes | Yes | Yes | Yes |
| Smallpdf | Yes | Limited presets | Yes | No (server upload) |
Add Watermark gives independent control over opacity, rotation angle, and size, applied across every page in your browser — useful for getting a watermark that's visible but doesn't obscure the underlying text, without uploading whatever's in the document.
Applies a watermark cleanly with a straightforward interface, though rotation is generally limited to a handful of presets rather than a free angle. Processing happens on their servers.
For fine-tuned control over how the watermark looks, iLoveDevTools gives more dials to adjust. For a quick standard watermark, Smallpdf is equally capable.