How to annotate a PDF
- Choose a PDF and open the intended page.
- Find searchable text for text markup, or drag directly for manual marks.
- Generate and review the actual reopened PDF before downloading.
Annotate PDF
Highlight searchable text and add flattened shapes, lines, or freehand drawing to PDF pages in your browser.
PDF bytes, stamp text, drawings, and coordinates stay in this browser tab and are never stored.
Add a PDF sourceOne PDF · 100 MB and 300 page safety limitsChoose from your device or drag and drop a file here.
Review a PDF and add reliable visible highlights, underlines, strikeouts, rectangles, ellipses, lines, or simplified freehand drawing without rasterizing whole pages.
How OpenFileTools processes it
Local processing, explicit choices.
Planning edits lightweight normalized overlays. On request, the browser maps them through page rotation, adds visible PDF drawing operators, validates geometry, and reopens the result.
Questions, answered.
Are these native PDF comments?
No. They are flattened visible marks that preserve the existing searchable text beneath them.
Can I highlight a scanned page?
Search-based highlighting needs searchable text, but manual shapes and freehand drawing work on scans.
Is annotation data stored?
No. It remains in memory for the current browser tab.