Slimvid

Preset · MKV to MP4 · stays on device

Convert MKV to MP4 Online

Remux a downloaded MKV into MP4 so phones, editors and chat apps will play it.

將影片拖放到這裡，或點擊選擇

每個檔案最大 1GB · 支援 MP4、MOV、WebM、MKV、AVI、WMV 等 30 多種格式

選擇多個檔案

在瀏覽器中本機處理，不上傳任何內容。

Settings

Add a video and the settings for this tool appear here.

How it works

  1. 1Drop the .mkv file.
  2. 2Leave the output on MP4.
  3. 3Convert and download. Remux is instant when the codec already fits.

Processed locally in your browser. Nothing is uploaded.

在瀏覽器中本機處理，檔案不會離開你的裝置。最大 1GB——更大的檔案請使用桌面應用程式。

MKV is a wrapper, not a codec

MKV can hold almost anything: H.264, HEVC, VP9, multiple audio tracks. Phones and many editors only want MP4 with H.264 plus AAC.

When the video is already H.264, we remux into MP4 without touching the picture. That is why a 2GB MKV can become an MP4 in seconds.

If the codec cannot live in MP4, we transcode with the hardware encoder. Extra subtitle tracks are not copied — burn them in an editor first if you need them.

What you get

Input
MKV
Output
MP4 (H.264 when transcoding)
Subtitles
Not copied; remux video/audio

三個步驟

How to convert MKV to MP4

無需註冊、沒有上傳佇列、沒有水印。一切都在你的裝置上完成。

  1. 1

    放入檔案

    Drop the .mkv file.

  2. 2

    選擇設定

    Leave the output on MP4.

  3. 3

    下載

    Convert and download. Remux is instant when the codec already fits.

Same job, other limits

Related size and platform pages

Convert MOV to MP4 OnlineTurn iPhone and camera MOV files into an MP4 that actually plays in browsers, Discord and slides.MOV → MP4Convert AVI to MP4 OnlineTurn old camera and screen-recorder AVI files into an MP4 that phones and browsers can play.AVI → MP4Convert WebM to MP4 OnlineTurn browser recordings and VP8/VP9 WebM files into MP4 for iPhone, Premiere and chat apps.WebM → MP4Convert MP4 to WebM OnlineMake a web-native WebM from an MP4 for HTML5 pages, Chrome recordings and lightweight embeds.MP4 → WebM

繼續探索

相關工具

常見問題

MKV to MP4 FAQ

桌面應用程式

檔案超過 1GB？交給桌面版。

瀏覽器版非常適合日常短片。當你需要處理大型素材或數十個檔案時，桌面應用程式能在你自己的硬體上更快完成。

取得搶先體驗比較網頁版與桌面版
  • 無檔案大小限制——4K、長達一小時的錄影，都能處理
  • 批次佇列：放入資料夾，套用同一組預設集
  • 硬體加速編碼（H.264 / H.265）
  • 完全離線執行，同樣的隱私保障