Scribeify

オンライン動画変換 — 主要フォーマットすべて

MP4, MOV, AVI, MKV, WebM, FLV, WMV をブラウザ内で相互変換。アップロード不要、アカウント不要、ウォーターマークなし。

オンライン動画変換 — 主要フォーマットすべて を3ステップで使う

  1. 1

    Pick your source video

    Drop or browse for the video you want to convert. Any format up to 2 GB is accepted.

  2. 2

    Select the target format

    Choose MP4, MOV, AVI, MKV, WebM, FLV, or WMV. Quality presets balance file size vs. visual fidelity.

  3. 3

    Download the converted file

    Conversion runs locally with FFmpeg.wasm. Your video never leaves your device.

オンライン動画変換 — 主要フォーマットすべて を選ぶ理由

  • Files stay local

    All conversion happens in your browser via WebAssembly. No upload to a server, no cloud copy.

  • All major formats

    Input and output support MP4, MOV, AVI, MKV, WebM, FLV, WMV, and 3GP. One tool covers every format you need.

  • Quality presets

    Pick from Original, High, Balanced, or Small to trade quality for file size smartly.

  • Parallel encoding

    FFmpeg.wasm uses multi-threaded encoding on supported browsers (Chrome, Edge) for faster results.

  • Unlimited and free

    No sign-up, no watermark, no file-count limit. Convert as often as you need.

オンライン動画変換 — 主要フォーマットすべて の利用者

  • Editor compatibility

    Final Cut wants MOV, Premiere prefers MP4, DaVinci eats MKV — convert once to the format your editor loves.

  • Platform requirements

    Twitter caps at MP4; WhatsApp prefers MP4; Discord auto-plays MP4 and WebM. Pick the right container.

  • Legacy device playback

    Older TVs and media players sometimes only read AVI or WMV. Convert to match the target device.

世界中のクリエイターのために

世界中のクリエイター、ジャーナリスト、学生、研究者のために。

よくある質問

Which formats are supported?
Input: MP4, MOV, AVI, MKV, WebM, FLV, WMV, 3GP, M4V. Output: the same list. Codec remux is used when possible for maximum speed.
Will converting reduce quality?
If input and output share the same codec, we copy streams without re-encoding (zero quality loss). Otherwise a quality preset controls the trade-off.
Is there a size limit?
Single files up to 2 GB work reliably in modern browsers. Larger files may run out of browser memory — consider splitting first.
Does it work on mobile?
Yes on iOS Safari 16+ and Chrome on Android. Conversion takes longer on mobile CPUs — short clips (< 2 min) are best.
Can I convert multiple files at once?
Currently one file per run. We plan to add batch conversion soon.
Is this tool really free?
Yes, unlimited, no watermark, no sign-up. We do not send your files anywhere.

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