loot.tools

Watermark PDF

Add a text watermark to every page of a PDF - a draft label, a copyright line, or 'CONFIDENTIAL'. Pick the text, angle, font size, and opacity, then download the watermarked file. It all runs in your browser with a JavaScript PDF engine, so the document never leaves your device.
PDF

Stamp a text watermark across every page of a PDF - a draft label, a copyright line, or "CONFIDENTIAL". Everything runs in your browser, so nothing is uploaded.

What this tool does

Upload a PDF, type the watermark text, and choose the angle (diagonal, horizontal, or vertical), font size, and opacity. The text is drawn across the center of every page in semi-transparent gray with the standard Helvetica font, and the result downloads as a new PDF. The original pages are untouched apart from the added mark.

Runs entirely in your browser

The PDF is read and rewritten on your own device, so there's no upload and no server. Drafts, contracts, and internal reports stay private to your machine, and it works offline once the page has loaded.

When you'd use it

  • Marking a document 'DRAFT' or 'CONFIDENTIAL' before sharing it
  • Stamping a copyright or ownership line across a portfolio
  • Labeling a sample or preview copy
  • Branding a handout with a name or URL