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無料 Video Converter
Convert video between MP4, WebM, MOV, MKV, and AVI. Great for making WebM play on iPhones or turning MOV into MP4. No upload — runs in your browser.
ファイルサイズ制限なしファイルはプライベートのままログイン不要永遠に無料
ファイルをここにドロップするか、クリックして選択
MP4, WebM, MOV, AVI, MKV, Video ファイルサイズ制限なし
ファイルがデバイスを離れることはありません。すべての処理はブラウザ内でローカルに行われます。
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使い方
Converting between video containers and codecs normally means uploading to a conversion site. This converter runs the real FFmpeg engine in your browser, so the file never leaves your device.
- 1FFmpeg.wasm loads onceThe WebAssembly build of FFmpeg (~30 MB) downloads on first use and is cached for instant reuse.
- 2You pick a target formatYour video is loaded into FFmpeg's in-memory filesystem. Nothing is uploaded — it stays in your browser's RAM.
- 3FFmpeg re-encodes to the new formatThe same x264/VP9/MPEG-4 encoders desktop FFmpeg uses run locally on your CPU to produce MP4, WebM, MOV, MKV, or AVI.
- 4The converted file is offered for downloadThe result is handed back as a downloadable blob and (for web-playable formats) previewed in-page.
A common need is making a WebM play on an iPhone (iOS Safari can't play WebM) — converting to MP4 fixes it instantly, with no upload, no queue, and no watermark.
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✓Completely free — no hidden costs, ever
✓No account, email, or login required
✓Files stay on your device — processing happens in your browser
✓Works on any device — phone, tablet, desktop
✓No watermarks on any output
✓Browser memory limits may apply for very large files
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