How to Cut MKV Without Re-encoding

Why You Need This

MKV files are often large, high-quality recordings from screen capture software, game recorders, or camera rips. Re-encoding these files to make a simple cut can take a very long time and will always reduce quality, even if only slightly.

The MKV container supports virtually every video and audio codec, making it a popular choice for archival and high-fidelity content. Cutting without re-encoding preserves all of this quality while completing the operation almost instantly.

FastCut Pro handles MKV files natively in the browser. It reads the container, lets you set precise cut points on the timeline, and writes a new MKV file containing only the selected segment. The video and audio streams are copied directly, so the process is both fast and lossless.

Step-by-Step Guide

1. Step 1: Open fastcut.cc and import your MKV file by dropping it into the editor.
2. Step 2: The timeline will show the full duration of the file along with the audio waveform.
3. Step 3: Drag the selection handles to define the portion of the MKV you want to keep.
4. Step 4: Verify that the export mode reads Lossless (-c copy) to ensure no re-encoding.
5. Step 5: Select MKV as the output container to preserve all original tracks including subtitles and chapters.
6. Step 6: Click Export and the trimmed MKV file will download within seconds.

Why Use FastCut Pro

• No Upload Required — Even very large MKV files are handled locally without any network transfer.
• Lossless Quality — Stream copy mode ensures the output is identical in quality to the input.
• 100% Free — No limits on file size, duration, or number of exports.
• Privacy First — Your files are processed on your machine and never touch a remote server.

Pro Tips

• MKV files with multiple audio tracks will have all tracks preserved in the lossless cut. You can select which tracks to include in the export settings.
• Chapter markers in the original MKV are adjusted to match the new start time in the exported file.
• If your MKV uses variable frame rate, FastCut Pro will handle timestamp correction automatically during the remux.