Privacy Policy

Last updated: May 29, 2026

ThumbnailChecker is designed to preview and analyze thumbnail images locally in your browser. The tool uses browser canvas to render the image at different sizes and estimate basic visual scores.

Thumbnail images

The tool does not require image uploads to a server. Selected images are loaded into your browser session so the preview, crop mode, and visual checks can run on your device.

Clipboard

If you click Copy report, the generated text report is copied through your browser clipboard API. The report is not sent to us.

Analytics and ads

This site does not currently include analytics or advertising code. If analytics or advertising is added later, this policy will be updated to describe the provider, data collected, and available choices.

Local storage

This version does not store your thumbnails or settings in local storage.

Contact

For privacy questions, contact chenmuxing168@gmail.com.