video converterは何に適していますか?
Video conversion helps turn MOV, AVI, MKV, WebM, and other common files into MP4, MOV, MKV, AVI, M4V, WebM, or TS. The tool runs ffmpeg.wasm in a Web Worker, and the input file is read only in the current browser.
Results can be previewed and downloaded immediately. First use downloads FFmpeg Core, and processing speed depends on duration, codec, and device performance.
サポートされている形式: MP4, MOV, MKV, AVI, M4V, WebM, TS;単一ファイルの制限: 500MB。
video converterの使い方
ステップ1
Select video
Upload a browser-readable video up to 500MB.
ステップ2
Choose output format
Choose MP4, MOV, MKV, AVI, M4V, WebM, or TS, then start local transcoding.
ステップ3
Preview and download
Confirm the converted video plays correctly, then download it.
よくある質問
Will video conversion upload my file?
No. Video is processed with ffmpeg.wasm in a browser Worker; network requests only download FFmpeg Core.
Which output format should I choose?
MP4 is usually the most compatible; MOV/M4V fit Apple workflows; MKV/AVI/TS fit some players or editors; WebM is useful for web playback.
Can the converted file be larger?
Yes. Size depends on the source bitrate, codec, duration, and content complexity.
テクノロジーとデータソース
- ffmpeg.wasm — Official FFmpeg project documentation for running FFmpeg in the browser.
- Comlink — Open-source RPC library for communication between the page and a Web Worker.