HeroTools / Image
Local · Private · Free

Image Annotator

Drop a screenshot and mark it up — arrows, boxes, numbered steps, text, highlighter and baked-in blur. Every edit happens entirely on your device.

⬆
Drop an image here
click to browse — or just press Ctrl+V to paste a screenshot
🔒 Files never leave your browser
—
0 annotations Del remove Ctrl+Z undo Shift straight / square
Quality 90

🔒 Everything runs locally — your image is never uploaded. Blur & pixelate are baked into the exported pixels, not a removable overlay.

Annotate like a pro — without sending your screenshot anywhere

Every arrow, box, badge and stroke is an editable object: switch to Select to move, restyle or delete anything, and undo/redo freely. Step badges auto-number themselves, the highlighter multiplies like a real marker, and blur/pixelate regions destroy the underlying pixels on export. Export full-resolution PNG or JPG, or copy straight to your clipboard. Completely free, completely private, works offline.

About Image Annotator

Image Annotator is a free, private image tool that runs entirely in your web browser. Mark up screenshots with arrows, boxes, text, blur & numbered steps — export PNG. Because everything happens locally on your device, your files and data are never uploaded to a server, there is no sign-up or installation required, and it keeps working offline. It is handy for annotate, screenshot markup, arrows, blur. Like every HeroTool by Digital Heroes, Image Annotator is 100% free with no limits.

How to use Image Annotator

  1. Open Image Annotator — it runs entirely in your browser, with no signup.
  2. Drag and drop your file (or click to browse) — it never leaves your device.
  3. Adjust the options to match exactly what you need.
  4. Copy or download your result — it is free, and your data stays on your device.

Frequently asked questions

Is Image Annotator free?

Yes — Image Annotator is completely free for everyone. No sign-up, no account and no usage limits.

Is it private? Are my files uploaded anywhere?

No. Image Annotator runs entirely in your browser on your own device, so your data never leaves your computer and nothing is uploaded to a server.

Does it work offline?

Yes. HeroTools is a Progressive Web App — once the page has loaded it keeps working offline, and you can install it as an app from your browser.

Do I need to install anything or create an account?

No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.

What does Image Annotator do?

Mark up screenshots with arrows, boxes, text, blur & numbered steps — export PNG.

Related Image tools

Browse all Image tools →

🗜Image CompressorShrink JPG, PNG & WebP with a live quality slider — no upload.⤢Image ResizerResize by pixels, percent or presets. Batch included.🔄Image ConverterConvert between PNG, JPG, WebP & more, right in the browser.✂Image CropperCrop, rotate & flip with aspect-ratio presets.💧Bulk WatermarkStamp text or a logo across many images at once.🌐Favicon GeneratorTurn any image into a full favicon & app-icon pack (.zip).