Online Screenshot Editor
Annotate any screenshot with arrows, boxes, text, highlights, step numbers, blur, and crop — free, in the browser, with nothing uploaded.
- 100% free
- No upload — runs in your browser
- No signup
- No watermark
How to annotate a screenshot online
Mark up a screenshot with arrows, text, and blur in four quick steps — no app install required.
Load the screenshot
Drag the image in, paste with ⌘V / Ctrl+V, or click the drop zone to choose a file.
Pick a tool
Choose arrow, box, ellipse, pen, highlighter, text, step number, blur, or crop from the toolbar.
Draw on the image
Click and drag on the canvas. Use undo/redo to fix mistakes, and switch colors or stroke width any time.
Export
Download the annotated screenshot as a PNG or copy it straight to your clipboard.
What this tool does
- Arrow, line, rectangle, ellipse, freehand pen and highlighter tools
- Text labels and auto-numbered step badges for tutorials
- Blur or pixelate regions to hide sensitive details
- Crop, undo/redo, and adjustable colors and stroke widths
- Export as PNG or copy to clipboard — no upload, no signup
Like the editor? It lives in an app.
Pizazoo for macOS has a full native markup editor plus AI organization for every screenshot you take. On-device, private, free to try.
Frequently asked questions
Is this a real editor or do I need to install something?
It is a full canvas editor that runs in your browser tab. Nothing is installed and nothing is uploaded — the image is processed locally on your device.
Can I add numbered steps for a tutorial?
Yes. The step-badge tool places auto-incrementing numbered circles — click in sequence to mark step 1, 2, 3 on the screenshot.
Is blur safe for hiding passwords or keys?
Light blur can sometimes be reversed. For anything sensitive, use the pixelate option at high strength or a solid box — or use our dedicated redaction tool, which defaults to safe settings.
Why does the exported image look sharper than the preview?
The preview is scaled to fit your window, but exports render at the original pixel resolution of your screenshot, so nothing is lost.
Can I edit screenshots like this automatically on a Mac?
Pizazoo for macOS includes this same kind of markup editor natively — plus automatic organization, OCR search, and redaction — all offline.