Trim MKV Online Free

MKV files are notoriously hard to edit on Mac and Windows without specialized software. JustTrimVideo handles MKV files natively - trim your Matroska videos directly in your browser with no conversion or re-encoding required.

What is MKV?

MKV (Matroska Video) is a flexible container format that can hold unlimited video, audio, and subtitle tracks. It's popular for high-quality video because it supports virtually any codec including H.264, H.265/HEVC, VP9, and more.

The MKV Problem on Mac & Windows

Unlike MP4 files, MKV files don't have native support in most operating systems:

  • Mac: QuickTime can't open MKV files at all. You'd need to install VLC or convert to MP4 first.
  • Windows: Movies & TV app has limited MKV support. The built-in video editor (Clipchamp) doesn't handle MKV well.
  • Most online tools: Either don't support MKV or convert it to MP4 first (losing quality and taking forever).

JustTrimVideo uses FFmpeg which has full MKV support - trim without conversion.

How to Trim MKV Files

  1. 1
    Select your MKV file

    Click "Choose File" and select your MKV video. It loads locally - no upload.

  2. 2
    Set your trim points

    Use keyboard shortcuts (I/O) or enter times manually. Preview works even for MKV.

  3. 3
    Download your trimmed MKV

    Output stays in MKV format with all original tracks (video, audio, subtitles) preserved.

Common Sources of MKV Files

Screen Recordings

OBS Studio defaults to MKV for crash-proof recording

Downloaded Videos

Many video downloads come in MKV format

Blu-ray Rips

MKV preserves multiple audio/subtitle tracks

Video Converters

HandBrake and others often output MKV

MKV Features Preserved

When you trim an MKV with JustTrimVideo, all container features are preserved:

  • Multiple audio tracks: All languages and commentary tracks stay intact
  • Subtitle tracks: Embedded subtitles (SRT, ASS, PGS) are preserved
  • Chapter markers: Any chapters within your trim range are kept
  • Metadata: Title, tags, and other info remain unchanged

Note: Browser Playback

Some browsers have limited MKV preview support. If the preview doesn't work, the trimming still will - you can enter times manually based on your video player's timecodes. The output will be a properly trimmed MKV file.

Related Pages

Trim WebM Online Trim MOV Online All Supported Formats Lossless Video Trimmer

Ready to trim your MKV?

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