Read & Annotate PDFs
Read PDFs directly in your browser while adding comments, highlights, drawings, shapes, and other markup - all in one interactive viewer.
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Built with EmbedPDF, an advanced open-source PDF viewer with full support for PDF annotation standards.
Annotation Tools
Text Markup
- Highlight, Underline, Strikeout, Squiggly underline
- Full color picker and opacity control (10-100%)
Drawing
- Pen - Freehand drawing with adjustable width (1-12px)
- Freehand Highlighter - Width (1-20px) and opacity control
Shapes
- Square, Circle, Line, Polygon
- Independent stroke and fill color, border width (0-12px), opacity
Comments & Text
- Comment - Attach comments to any location
- Insert Text / Replace Text - Mark text insertions and replacements
- Text box - Free text with font size, alignment, and background color
- Note - Sticky notes with background color
Images
- Add Image - Place images or photos anywhere on the page
For adding signatures (typed, drawn, or uploaded), use the dedicated Sign PDFs tool.
Comment Threads
- Reply threads on any annotation
- Author attribution and timestamps
- Comments sidebar listing all comments grouped by page; within each page, comments appear in visual reading order (top-to-bottom, left-to-right)
- Click to navigate to the source annotation
Side Panels
- Dedicated side panels for comments, annotations, and attachments, each with quick controls for adding items
- A clear all button removes every comment or annotation in one action
Viewer Features
- Page navigation (first/prev/next/last, direct page jump)
- Zoom in/out with manual percentage entry
- Single page and dual-page spread modes
- Thumbnail sidebar, bookmark sidebar, attachment sidebar
- Full-text search (Ctrl+F) with result highlighting and navigation
- Text selection with select-all (Ctrl+A) and a floating Copy button that appears over the selection
- Print (Ctrl+P)
Keyboard Shortcuts
| Shortcut | Action |
|---|---|
| Ctrl+A | Select all text |
| Ctrl+F | Search |
| Ctrl+P | |
| Ctrl+S | Save changes |
| Ctrl+Z | Undo |
| Ctrl+Shift+Z / Ctrl+Y | Redo |
| Ctrl++/- | Zoom in/out |
| Ctrl+0 | Fit to width |
| Home / End | First / last page |
| PageUp / PageDown | Previous / next page |
Saving
- Save Changes button or Ctrl+S to apply annotations
- Undo/redo history available before saving
- Annotations are embedded in standard PDF format and compatible with Adobe Acrobat, Foxit Reader, PDF-XChange, and macOS Preview
Related Documentation
- Multi-Tool - Page editing workspace
- Sign PDFs - Add signatures
