Image Annotator
Draw arrows, boxes, text, highlights, and mosaic blur on screenshots or photos in your browser. Free online image annotation tool - no upload, exports PNG.
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What is Image Annotator?
Image Annotator is a browser-based markup tool for screenshots and photos: draw arrows, boxes, freehand strokes, text labels, highlights, and mosaic censoring, then export the annotated image as PNG - all locally, no upload.
Key Benefits
- 100% private, on-device processing
- Six annotation tools in one canvas
- Undo and live preview
- PNG download or clipboard copy
- No account or watermark
Common Use Cases
- •Bug reports with marked screenshots
- •Tutorial and how-to illustrations
- •Censoring faces and private data
- •Annotating receipts or documents
- •Marking up UI mockups for review
How to Annotate an Image
- Upload: Drag & drop or pick a PNG, JPG, WebP, or GIF. The image stays on your device.
- Choose tool: Pick arrow, box, brush, text, highlight, or mosaic, then set color and sizes.
- Annotate: Draw on the canvas. For text, type the label first and click where it should go. Use Undo to step back.
- Export: Download the PNG or copy it straight to your clipboard.
Key Features
- Draw arrows and boxes to point out details
- Freehand brush with adjustable stroke width
- Text labels with adjustable size
- Translucent highlighter for emphasis
- Mosaic censoring for faces and private data
- Export as PNG via download or clipboard
Frequently Asked Questions
Do my images get uploaded anywhere?
No. All annotation runs locally in your browser with the HTML5 canvas - the image never leaves your device.
Which formats are supported?
PNG, JPEG, WebP, and GIF inputs. The annotated result is exported as PNG.
Can I censor faces or license plates?
Yes - the mosaic tool pixelates any rectangular area you drag over the sensitive region.
Can I copy the result instead of downloading?
Yes. The copy button puts the PNG on your clipboard in browsers that support the Clipboard API; otherwise use Download.