Privacy

Effective August 13, 2026

Your selected file stays local

The checker uses browser File and Blob.slice() APIs. It does not upload your file. The interface does not display or transmit the file name. MP4 bytes, logical size, box types, offsets, result status, and the copied command are not included in analytics.

Coarse event counting

The production site may count four coarse events: tool opened, file selected, analysis completed, and command copied. Each event contains only the event name and either production or preview. The endpoint rejects additional fields. These counts help determine whether the experiment is used; they cannot reconstruct your input.

Storage and third parties

The tool does not create an account, set an application cookie, or use local storage. Cloudflare delivers the site and may process ordinary network metadata under its own infrastructure policies. Closing the tab releases the in-memory result.

Contact

For a privacy question, email yitanwang60@gmail.com. Do not attach a private media file.