Convert MKV to MP4 in Seconds

MKV not playing where you need it? Cacao Docs converts it to MP4 instantly — universally compatible, free, and right in your browser.

Instant MKV to MP4

No Signup Required

Works on Any Device

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または

使い方

3ステップ。インストール不要。数分で完了。

MKV to MP4 Converter — Convert MKV Video Files to MP4 Online Free | Cacao Docs

Upload Your MKV. Drag your MKV file into Cacao Docs. Big files, multiple audio tracks, subtitles baked in — we handle it all without complaining.

Cacao Docs Converts It. Our engine remuxes your MKV into a clean MP4 container in seconds. High quality, fast, no fuss.

Download Your MP4. Hit download and you are done. Your MP4 plays on any phone, TV, browser, or video editor — no more compatibility drama.

あなたの完全な音声・動画ツールキット

書き起こし、変換、抽出 — 音声・動画のすべてを一箇所で処理。

AI書き起こし

話者ラベル、タイムスタンプ、95%以上の精度で音声をテキストに。

フォーマット変換

MP3、WAV、M4A、OGG、FLAC — 任意の音声または動画フォーマットを瞬時に変換。

動画から音声へ

MP4、YouTube、Zoom録音などから音声を抽出。

超高速

ほとんどのファイルは3分以内に処理。待ち時間なし。

登録不要

すぐに開始

100%安全

自動削除

ブラウザベース

インストール不要

このツールを愛用する人々

ポッドキャスター、研究者、マーケター、リモートチームが毎日利用しています。

Feb 12

Finally plays on my TV

Had a bunch of MKV movies that my Smart TV refused to play. Cacao Docs converted them all to MP4 and now everything works perfectly. Took like 5 minutes total.

Marco Bianchi

Jan 28

Zero quality loss, seriously

Was worried about losing quality converting a 4K MKV. Cacao Docs remuxed it perfectly — same sharpness, same audio. Couldn't tell the difference.

Hannah Steele

Feb 5

Cleanest free converter I found

No watermarks, no ads, no email required. Cacao Docs just converts and lets you download. Refreshing compared to every other site out there.

Raj Mehta

824 人が今日ファイルを変換しました

読み込み中...

信頼され、認定された業界のリーダー

なぜこの音声・動画ツールを選ぶのか

Plays Literally Everywhere

MKV is great but not universal. MP4 works on iPhones, Android, Smart TVs, YouTube, and every video editor out there. Cacao Docs gets you there fast.

No Quality Loss

Cacao Docs remuxes your video without re-encoding when possible, so the picture and audio quality stay exactly as they were in the original MKV.

Handles Big Files

MKV files can be massive — full movies, multi-episode rips, 4K footage. Cacao Docs chews through large files without choking your browser.

Batch Convert

Got a whole folder of MKVs to convert? Cacao Docs lets you queue them up and knock them out one after another. No repetitive uploading.

Transcribe the Audio After

Once you have your MP4, run it through Cacao Docs AI transcription to pull out subtitles, captions, or a full text transcript. One platform, full workflow.

Encrypted & Auto-Deleted

Your video is encrypted on upload and wiped from Cacao Docs servers the moment conversion is done. Zero data stored, zero risk.

Plays Literally Everywhere

MKV is great but not universal. MP4 works on iPhones, Android, Smart TVs, YouTube, and every video editor out there. Cacao Docs gets you there fast.

No Quality Loss

Cacao Docs remuxes your video without re-encoding when possible, so the picture and audio quality stay exactly as they were in the original MKV.

Handles Big Files

MKV files can be massive — full movies, multi-episode rips, 4K footage. Cacao Docs chews through large files without choking your browser.

Batch Convert

Got a whole folder of MKVs to convert? Cacao Docs lets you queue them up and knock them out one after another. No repetitive uploading.

Transcribe the Audio After

Once you have your MP4, run it through Cacao Docs AI transcription to pull out subtitles, captions, or a full text transcript. One platform, full workflow.

Encrypted & Auto-Deleted

Your video is encrypted on upload and wiped from Cacao Docs servers the moment conversion is done. Zero data stored, zero risk.

MKV to MP4 Online

登録不要。ツールを選んで始めましょう。

Convert MKV to MP4

4.6

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4.5

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4.6

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よくある質問

音声・動画の書き起こしと変換ツールに関する簡単な回答。