Question 1

Is my video uploaded to a server?

Accepted Answer

No, conversion is done locally in your browser using FFmpeg compiled to WebAssembly (ffmpeg.wasm).

Question 2

Why does processing take time?

Accepted Answer

Video transcoding is resource-intensive; speed depends on the video's length and your device's performance.

Question 3

Is there a file size limit?

Accepted Answer

The limit depends on available browser memory; very large files (over 1–2 GB) may process unreliably.

Question 4

Is the first run slower?

Accepted Answer

Yes, the FFmpeg engine (around 30 MB) is downloaded on first use and then cached by the browser.

Question 5

Is video quality preserved?

Accepted Answer

Standard encoding settings are used, balancing quality against file size.

Video Converter

How to use it