Highlight · draw · comment · stamp
Highlight and annotate a PDF online, free
Mark up a document the way you would on paper: highlight and underline text, draw with a pen or marker, add shapes and arrows, leave comments and stamp it. Bullet PDF keeps the whole thing in your browser, so the file stays private.
- Free
- No upload
- No sign-up
- No watermark
- Works offline
How to annotate a PDF
Open the PDF
Click Annotate a PDF and choose the file. It opens in Annotate mode.
Mark it up
Drag across text with Highlight, Underline or Strikethrough; draw freely with Pen or Marker; add rectangles, ellipses, lines and arrows; drop a Comment or a Stamp.
Download
Press Download PDF. Highlights and drawings become part of the page and comments are saved as real PDF notes that open in any reader.
Annotation tools
Text markup
Highlight, underline, strike through and squiggle, snapped to the lines of text, in any colour.
Pen and marker
Smooth, pressure-aware ink for handwriting, and a translucent marker that lets the text show through. An eraser removes strokes.
Shapes and arrows
Rectangles, ellipses, lines and arrows with adjustable stroke, fill, dash and opacity.
Comments
Sticky-note comments that are exported as genuine PDF annotations, listed in the sidebar so you can jump between them.
Stamps
APPROVED, DRAFT, CONFIDENTIAL or your own text, with an optional date or name line.
Works with a pen
Made for stylus and touch: Apple Pencil, Surface Pen and Android styluses draw naturally.
Questions about this tool
Will my highlights show up in Adobe Acrobat or Preview?
Yes. Highlights, underlines, drawings and shapes are drawn into the page, and comments are written as standard PDF note annotations, so every reader shows them.
Can I remove an annotation later?
Inside Bullet PDF, select it and press Delete, or use Undo. After you download, drawn markup is part of the page; keep your original file if you might need a clean copy.
Can I highlight text in a scanned PDF?
Text highlighting needs real text. On a scanned page, hold Alt while dragging to draw a free highlight box, or use the marker tool.
Can I annotate a PDF on an iPad with Apple Pencil?
Yes. Open the site in Safari (17 or later) and draw with the Pencil; pressure and tilt give a natural line.
Is there a limit on pages or file size?
No fixed limit. Bullet PDF is tested with 500-page documents. Very large scanned files depend on your device's memory.
Ready?
It opens in a second. Nothing to install, nothing to sign up for.
Annotate a PDF