Tool under construction. Launching March 20, 2026. Code will be open sourced under AGPL license. Current version is for testing purposes only.
Modufile
PDF ToolsAdd Watermark

Add Watermark

Overlay text watermarks on your PDF pages.

Drag and drop your files here

or click to browse. Supports PDFs, PNG, JPG, DOCX, and more.

Private.

Watermark Settings

#FF0000

About Add Watermark

Modufile's Watermark PDF tool lets you add customizable text watermarks to every page of a PDF document. You can configure the watermark text, font size, color, opacity, and rotation angle — placing it diagonally, horizontally, or at any custom angle. The watermark is drawn as a native vector text overlay using pdf-lib, so the original PDF quality and searchability are fully preserved. Everything runs in your browser with no file uploads. This tool is commonly used to mark documents as "Draft," "Confidential," or "Sample," or to add branding to shared files.

Tech Stack

pdf-libDraws text watermarks onto each page with customizable font, color, opacity, and rotation

Frequently Asked Questions