How browser-only media processing protects your files

Understand local video and audio processing, browser memory limits, and what deleting a result actually does.

What happens when you select a file

A browser file input lets the page read a file you choose. Local editing uses the selected bytes in your device memory rather than uploading them to a conversion API. On this site, the current conversion workers and subtitle editors are designed for on-device operation; an HTTP status check alone does not prove that every workflow operates correctly.

What local processing does not guarantee

A media file may be large when decoded, even if its compressed size is small. WebAssembly memory, browser tabs, CPU heat, and battery are limiting factors. Closing or backgrounding a tab can interrupt processing, especially on mobile devices. Some browsers cannot decode or encode particular codecs; an extension such as .mp4 is not proof of codec support.

Temporary results and downloads

Local results may be held in session memory and represented by temporary object URLs. Reset or Delete can release these objects, while closing a tab normally frees page memory. A completed download is a separate file on your device and cannot be deleted by the website. Tab closure cannot guarantee immediate secure erasure of all browser or operating-system memory.

Storage and permissions

The current release does not intentionally save media in IndexedDB, Cache Storage or a server library. The site may remember the light/dark theme preference. Microphone, webcam and screen recording require browser-controlled permissions; restrictions are not bypassed.

What to check before using a tool

Use a short sample first, view supported output formats, and confirm playback before deleting your original. For sensitive work, avoid external browser extensions you do not trust. If an operation is unsupported on your device, do not assume it completed merely because a file was downloaded.

Method review: 18 October 2026. Examples are educational, not device compatibility guarantees. See supported formats and limits and privacy practices.