Is my file uploaded to a server?

No. This tool runs entirely in your browser via WebAssembly — your file never leaves your device. You can verify this in your browser's DevTools Network tab.

What can I add to a PDF?

Text, sticky notes, highlights, freehand drawing, shapes, and images.

Can I edit the existing text in the PDF?

This is an annotation editor — you add on top of the PDF. In-place text editing is on the roadmap.

PDF Editor

Annotate, highlight, draw, and mark up your PDFs.

Local processing — your files never leave your browser