Free PDF Annotation Tool
Add text notes, highlight boxes, and stamps to PDF pages. Specify position, color, and opacity. Download the annotated PDF instantly.
Upload PDF
Drag & drop your PDF here
or click to browse
Tips
- Position coordinates are expressed as percentages of the page size
- Add multiple annotations before applying — they all get applied in one pass
- Stamps appear centered on the page at 60% opacity
- All processing is local — your PDF never leaves your browser
Frequently Asked Questions
What is the PDF Annotation Tool?
The PDF Annotation Tool is a free online tool that add text notes, highlight boxes, and stamps to pdf pages. specify position, color, and opacity. download the annotated pdf instantly.. It runs entirely in your browser with no installation or sign-up needed.
What annotation types are supported?
Text notes (with position and font size), highlight boxes (with custom color and opacity), and stamps (DRAFT, APPROVED, etc.).
Can I add multiple annotations?
Yes. Add as many annotations as needed before applying them all in a single pass.
Is it free?
Yes, completely free. All processing happens in your browser using pdf-lib.
Is my data safe with this tool?
Absolutely. The PDF Annotation Tool processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.
Does the PDF Annotation Tool work on mobile devices?
Yes, the PDF Annotation Tool is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.
Do I need to create an account to use this tool?
No account or registration is needed. Simply open the PDF Annotation Tool in your browser and start using it immediately. There are no sign-up walls or usage restrictions.
Is there a file size limit?
Since the PDF Annotation Tool processes files in your browser, the size limit depends on your device's memory. Most devices can handle PDFs up to 50-100MB without issues.
How do I use the PDF Annotation Tool?
Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.
Which browsers are supported?
The PDF Annotation Tool works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.
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About Free PDF Annotation Tool
Free PDF Annotation Tool is a free, browser-based tool in our PDF Tools collection. Everything runs locally on your device — no uploads, no sign-up, and your data stays private.