ファイル・メディア
ビデオ形式変換
MP4, WebM, MOV, AVI, MKV — all directions.
Drop a file or click to browse
MP4, WebM, MOV, AVI, MKV — re-encoded with sensible defaults
FFmpeg.wasm runs entirely in your browser. The first use downloads ~30 MB of engine — cached for every subsequent run.
編集者注
Understanding · Containers, codecs, and three numbers that matter.
この詳細な解説章は現在、英語版のみで提供されています。上の変換ツールはあなたの言語で動作しますが、長文の解説記事はまだ翻訳されていません。
よくある質問
Quick answers.
›Is my video uploaded to a server?
No. The conversion happens locally on your computer using your browser's resources, so your video data never leaves your device.
›Which video formats are supported?
We support most standard containers including MP4, WebM, MOV, AVI, and MKV, along with common codecs like H.264 and VP9.
›What is the maximum file size?
The limit depends on your system's available RAM, as the entire conversion process runs within the browser's memory environment.
›Will I lose quality during conversion?
Transcoding often involves some loss of data. Use a high-bitrate setting or high-quality preset to minimise visible artifacts in the output file.
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