What is Image Annotation?

Image Annotation lets you mark up screenshots, photos, and diagrams with arrows, shapes, and text labels. Great for bug reports, tutorials, feedback, or calling out details. Your images stay private and never leave your device.

The toolbar covers arrows, rectangles, circles, freehand lines, text, a marker-pen highlight, numbered pins for sequential steps, and a blur tool that redacts sensitive content. Stroke colour, stroke width, fill colour, font size, and per-object opacity are all adjustable, and shapes stack in z-order so you can bring them forward or send them back. Single-key shortcuts (A R C L T D H N B) switch tools instantly, Ctrl+Z undoes up to 50 steps, Ctrl+Shift+Z steps back forward, and Ctrl+V pastes a screenshot straight from the clipboard. Export as a flattened PNG or JPG, or copy it straight to the clipboard.

How to use

1. Step 1 — Upload an image by clicking the upload area or dragging and dropping a file. Supported formats include PNG, JPEG, and WebP.
2. Step 2 — Choose an annotation tool (arrow, rectangle, circle, line, or text) from the toolbar. Adjust color, stroke width, and font size as needed, then draw directly on the image.
3. Step 3 — Rearrange or delete annotations, then click Download PNG or Download JPG to save the annotated image. You can also Copy to send it straight to the clipboard for pasting into chat or email.

When to use

• Filing a bug report with a screenshot that points to the broken element.
• Marking up a design mock to explain a change request to a colleague.
• Highlighting a region on a map, X-ray, or scanned receipt for a friend or doctor.

Result

A QA tester takes a screenshot of a misaligned button and uses the arrow tool to point to the gap, draws a red circle around the affected area, and adds a text note '8px misalignment' — then downloads and attaches it to the bug report.

FAQ

Can I edit the annotations after I download the image?

The download flattens the markup into the PNG, so the arrows and shapes become pixels. To edit later, keep the original image and re-load it here, or use a layered editor like Photoshop or GIMP and save the annotation layers separately.

Why is the arrow drawing slow on a 10MP photo?

Very large images make every redraw heavier because the canvas has to repaint the full source pixels. Resize the image to about 2000 px wide before uploading — annotations still read clearly and the tool feels much snappier.

How do I add a numbered label like 1, 2, 3?

Pick the text tool, type the number, then click to place it. Repeat for each label. Draw a circle around each numbered area, and add a caption listing what each number means.

Can I redact sensitive information like emails or names?

Yes. Use the rectangle tool with a solid fill (e.g. black) and place it over the sensitive area. Because the PNG is flattened, the covered pixels are gone from the export, so the recipient cannot remove the rectangle to reveal what is underneath.

What is the file size limit?

Up to 20 MB per image. The tool accepts PNG, JPEG, and WebP. Very large source files load slowly on mobile and may run out of memory — for screenshots, PNG is usually a few hundred KB, well within the limit.

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