Image Annotator Online
Draw arrows, add text labels, rectangles, circles, and freehand lines directly on images. Perfect for tutorials, bug reports, design reviews, and documentation. No upload, no signup.
Drop image here or browse files
Supports JPG, PNG, WebP · Max 50 MB
About the Image Annotator
ToolZeel's Image Annotator is a browser-based image markup tool for adding visual annotations to screenshots, photos, and diagrams. Use it to highlight important areas with arrows, label elements with text, highlight with rectangles or circles, or sketch freehand drawings directly onto your images.
Common use cases include: creating tutorials and how-to guides, filing bug reports with highlighted issues, giving design feedback, annotating medical or scientific images, and adding callouts to presentations.
How to Annotate an Image
Upload Your Image
Drop or click to select a JPG, PNG, or WebP image. You can also paste a screenshot from your clipboard.
Choose a Tool
Select Arrow, Rectangle, Circle, Text Label, Freehand, or Line from the toolbar. Pick your color and stroke width.
Draw on the Image
Click and drag to draw shapes or arrows. For text, type in the input bar then click on the image to place it.
Download PNG
Click "Download PNG" to save the annotated image. Use Undo to remove the last annotation.
Frequently Asked Questions
No. All annotation is done locally using the HTML5 Canvas API. Your images never leave your device.
Yes. Click "Undo" to remove the most recent annotation. Each stroke/shape is tracked as a separate action.
Available tools: Arrow (with arrowhead), Rectangle, Circle/Oval, Text Label, Freehand pen, and Line. Each supports custom color, stroke width, and fill option for shapes.