🖊️

Screenshot Annotator

FREEactive

Add arrows, boxes, text and highlights to screenshots. No software needed.

Image#screenshot#annotator
🔒100% client-side
🚫Nothing stored
💸Free forever
🌐Works offline
Community

Step-by-step

How to Use Screenshot Annotator

📁

Upload your image

Drag and drop an image, or click to browse. Supports JPEG, PNG, WebP and GIF.

⚙️

Adjust settings

Set compression quality, resize dimensions, output format, or other processing options.

▶️

Process the image

Click Process. The operation runs entirely in your browser using the Canvas API.

⬇️

Download the result

Preview the output, then click Download to save the processed image to your device.

💡 Pro Tips

  • ›Images are processed client-side — your photos never leave your browser.
  • ›Compare before/after using the preview toggle.
  • ›Use PNG for graphics and JPEG/WebP for photographs.

Examples

Screenshot Annotator in Action

Example 1— Compress JPEG

Input

2.4MB photo.jpg (quality 85)
→

Output

340KB — 86% smaller, no visible quality loss
Example 2— Color pick

Input

logo.png (click pixel)
→

Output

#0066FF · rgb(0, 102, 255)

📄 Full Guide

Screenshot Annotator: Complete Guide & Tutorial

In-depth guide covering how it works, examples, tips and advanced use cases.

Read Article →
🔒
Client-Side
Nothing leaves your browser
💸
Free Forever
No limits, no sign-up
🌐
Works Offline
No internet needed
🚫
No Tracking
Zero data collected

FAQ

Frequently Asked Questions

QIs the Screenshot Annotator free to use?

Yes, the Screenshot Annotator is completely free. No account, no sign-up, and no hidden limits.

QDoes the Screenshot Annotator store my data?

No. The Screenshot Annotator runs 100% in your browser. Your data never leaves your device and is never sent to any server.

QDoes the Screenshot Annotator work offline?

Yes. Once the page has loaded, the Screenshot Annotator works completely offline. No internet connection needed to use it.

QIs there a limit on input size?

The Screenshot Annotator handles most typical inputs without issue. Very large inputs may be slower on older devices, but there is no hard limit.

QCan I use the Screenshot Annotator on mobile?

Yes. The Screenshot Annotator is fully responsive and works on smartphones and tablets. Use a modern browser like Chrome, Firefox, or Safari.

QIs the Screenshot Annotator open source?

STARVO tools are free to use. The STARVO platform is available on GitHub. All tool logic runs client-side, so you can inspect it using browser DevTools.

QHow accurate is the Screenshot Annotator?

The Screenshot Annotator uses well-tested algorithms. For critical work, always verify the output against a secondary source.

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