Annotate PDF Online
Add text annotations, highlights, and sticky notes directly to your PDF. Draw, highlight text, add comments, and mark up your documents with a full suite of annotation tools.
Supports PDF · up to 100 MB
Annotation Tools
Annotation Settings
Page Navigation
Select a tool above, then click or drag on the PDF to add annotations
Processing annotations...
✓ PDF annotated successfully!
How It Works
- Upload your PDF file using the drop zone above.
- Select an annotation tool from the toolbar (Text, Highlight, Draw, or Eraser).
- Customize the color, brush size, and font size to match your preferences.
- Click or drag on the PDF page to add annotations.
- Navigate between pages using the Previous/Next buttons to annotate multiple pages.
- Click "Save & Download PDF" to embed all annotations into your PDF and download it.
Why Annotate PDFs?
PDF annotations are essential for document review, collaboration, and feedback. Whether you're reviewing contracts, grading assignments, marking up designs, or providing feedback on documents, annotations help you communicate clearly and organize your thoughts. This tool lets you add professional annotations directly to your PDFs without needing expensive software.
Annotation Features
- Text Annotations · Add sticky note-style text annotations anywhere on the page. Click to place, type your comment, and customize the font size.
- Highlights · Create highlight rectangles in any color to mark important sections of text or areas of your PDF.
- Freehand Drawing · Draw directly on the PDF with a customizable brush size. Perfect for sketches, diagrams, and markup.
- Eraser · Remove annotations easily with the eraser tool without affecting the original PDF content.
- Color Picker · Choose any color from the color picker to match your annotation style and preferences.
- Multiple Pages · Navigate through all pages of your PDF and annotate each one individually.
- Opacity Control · Adjust the opacity of your annotations from 0-100% for subtle or prominent markups.
- Save & Download · Embed all annotations into the PDF and download your marked-up document.
Frequently Asked Questions
Are my annotations saved securely?
Yes. All annotations are processed in your browser and embedded into the PDF when you download it. Your original PDF is never uploaded to any server, and all processing happens on your device.
Can I annotate all pages of a PDF?
Yes. Use the page navigation buttons to move between pages. Each page can have its own annotations. All annotations are saved when you download the PDF.
Can I undo or erase annotations?
Yes. Use the Eraser tool to remove individual annotations from the current page. You can also use the "Clear Page" button to remove all annotations from the current page.
What file formats are supported?
This tool supports standard PDF files (.pdf). The annotated file is downloaded as a PDF, which is compatible with all PDF readers and viewers.
Are there size limits for PDF files?
You can upload PDF files up to 100 MB. Very large files may take longer to load and process. For best performance, keep files under 50 MB.