Private Local File Tools

Create bounded local outputs from files you own. ADD AT does not upload these browser-only operations.

Local file inspector

Your file bytes never leave this device: no upload, network request, storage, or server processing.

This only shows the name, size, declared type, and a bounded first-byte check. It does not validate file safety or process the file.

Rights confirmationI confirm that I own this file or have permission to inspect it locally.

Choose a local fileAvailable types: MP4, WebM, MP3, WAV. Limit: 16 MB.

The selected file stays in this browser. One job at a time, 16 MiB maximum, 90-second stop.

I own this file or have permission to process it locally.

Choose an owned file

Operation Extract one video frame (JPG) Convert SRT ↔ VTT Compress video to WebM when supported Extract audio to WebM when supported

No MP3/WAV or server-side conversion is simulated. Video compression and audio extraction depend on local MediaRecorder support.