Online Image Annotator
A free, browser-based tool to annotate images. Draw shapes, add text, use a pen, and apply mosaic/blur effects to highlight or redact information. No uploads required.
or drag and drop it here to start annotating.
A Full-Featured Annotation Toolkit
Highlight & Emphasize
Use rectangles, ellipses, and arrows to draw attention to important details in screenshots, photos, and diagrams.
Communicate Clearly
Add text directly onto your images to provide context, labels, or instructions. Perfect for tutorials and feedback.
Redact & Censor
The mosaic tool lets you easily pixelate sensitive information, protecting privacy by obscuring faces, names, or numbers.
Common Use Cases
- Technical Support: Circle or point to issues in a screenshot to clearly explain a problem.
- Education & Tutorials: Create step-by-step visual guides by annotating screenshots with numbers and text.
- Design Feedback: Mark up mockups and designs with comments and suggestions for your team.
- Privacy Protection: Before sharing photos online, use the mosaic tool to blur out personal information.
Frequently Asked Questions
Is this tool free to use?
Yes, our online image annotator is completely free to use with no limitations or watermarks.
Are my images safe and private?
Absolutely. All annotation and processing happens directly in your web browser. Your images are never uploaded to our servers, ensuring 100% privacy and security.
What is the Mosaic tool for?
The Mosaic tool allows you to pixelate a selected area of your image. It's perfect for redacting sensitive information like faces, license plates, names, or addresses before sharing an image online.
Can I undo a mistake?
Yes, you can use the 'Undo' and 'Redo' buttons in the toolbar to easily step back and forth through your changes.
Your Privacy is Our Priority
This tool runs entirely in your browser. We do not upload, store, or analyze your files. Everything you process stays on your device. Period.