Draw, mark, and highlight images with ease. All processing happens locally in your browser for complete privacy.
A complete browser-based image annotation solution that lets you add markers, text, shapes, and drawings directly onto images. Perfect for design feedback, educational materials, technical documentation, and content creation. If you need to prepare images for documentation, you might also find our tool for converting images to PDF useful for compiling annotated visuals into reports.
All image processing occurs locally using HTML5 Canvas technology. No files are transmitted to external servers, ensuring complete confidentiality of your sensitive images and documents. For those concerned about metadata, you can use our standalone image metadata remover to strip sensitive data before or after annotation.
Output Quality: Annotations are rendered as vector graphics and saved as part of a raster image. The final output resolution matches your original image dimensions.
Performance: Large images (above 8MP) may experience slower rendering. For optimal performance, consider using an image resizer tool to scale images to their intended display size before annotating.
Limitations: Maximum canvas size varies by browser (typically 16,384×16,384px). Very large images may be automatically downscaled by the browser for display.
All modern browsers support JPG, PNG, GIF, WebP, and BMP formats. The tool preserves your original image format's color profile and compression characteristics. Annotations are saved in PNG format for optimal quality with transparency support. If you need a different format, try our image converter before annotating.
The downloaded image maintains the original's resolution and dimensions. Annotations are rendered at display resolution. For printing applications, ensure your source image has sufficient DPI (300 DPI recommended for print). No automatic compression is applied to the output. You can always use our image sharpener tool afterward if the text needs to be crisper.
Yes, once loaded, the entire tool functions offline. All processing happens locally in your browser using HTML5 Canvas API. No internet connection is required after initial page load.
Browser memory limits apply. Typically, images up to 10-20MB work reliably. Very large images may cause browser performance issues. For large images, consider resizing before annotation using a dedicated tool.
Browser Support: Compatible with Chrome 60+, Firefox 55+, Safari 12+, Edge 79+. Requires JavaScript and Canvas support.
Mobile Devices: Fully functional on tablets and smartphones with touch gestures for drawing.
Color Accuracy: Annotation colors are displayed using your monitor's current color profile. For critical color work, calibrate your display. If you need to extract a specific color from your annotated image, consider our color picker tool for precision.
Last Updated: April 2025. Regularly tested for browser compatibility and security.