Annotate PDF Online Free

Highlight, underline, draw and comment on any PDF. No upload — annotations stay in your browser.

Drop your PDF here

or

How to Annotate a PDF Online — Free

1. Drop your PDF into the upload area.
2. Choose a tool — Highlight, Underline, Draw, or Comment.
3. Click and drag on the page to add annotations.
4. Click Download PDF to save your annotated document.

What annotation tools are available?

Highlight (drag to mark areas), Underline, Freehand Draw with adjustable color and line width, and Comment pins to leave notes.

Annotate PDF on iPhone and Android

Works in mobile Safari and Chrome. Touch drawing is supported for highlights and freehand annotations.

Frequently Asked Questions