Add Watermark

What this tool accepts

.PDF input · .PDF output

Local safeguards

1 PDF file · 100 MB. 500 pages/file · 200 characters max in watermark text · 128 MB max result

Private and offline-capable

Processing happens in this browser. Files are not uploaded, and generated results remain in memory until downloaded or the tab is closed. After the first successful production load, the app shell and local processing engines can work offline.

Related tools

• Merge PDF
• Split PDF
• Remove Pages
• Extract Pages
• Organize PDF
• Scan to PDF

Free and open source

Inspect how Local File Studio processes your files, run your own copy, or help improve the tools. Application code is available under Apache License 2.0; bundled libraries and assets retain their own licenses.

View source on GitHub · Contribute · Apache 2.0 license · Third-party notices

Links open in a new tab. GitHub requires a connection; the license and notices are included in the offline app.