Annotate PDF Online Free: Highlight, Draw & Add Text
Highlight, underline, draw, box, and add text notes to any PDF. Baked in on download.
Review contracts, grade papers, and mark up reports without a desktop editor. Pick a tool, highlighter, underline, freehand pen, rectangle, or text note, choose a color, and annotate directly on the page at any zoom. Undo, clear, and per-page navigation included; the markup is flattened into the downloaded file so it shows in every viewer.
How to Use It
- Upload your PDF and wait for the local preview to load.
- Adjust the settings: Adjust the available settings and run the tool locally in your browser.
- Download the result: Download the processed file directly to your device.
Frequently Asked Questions
What annotation tools are included?
Highlighter, underline, freehand pen, rectangle outline, and text notes. Each with selectable colors, plus undo and clear-page.
Will my annotations show in other PDF viewers?
Yes. On download the markup is drawn permanently into the page content, so it renders in every PDF viewer and survives printing.
Can I edit or remove annotations later?
Inside the editor you can undo or clear before downloading. After download the markup is flattened into the page and can no longer be removed, so keep your original file.
Is my PDF uploaded anywhere?
No. Rendering and baking run fully in your browser with pdf.js and pdf-lib. Supported document contents are not uploaded for processing.