SquishClipConvert MKV to MP4
Remux MKV to MP4 in seconds — video quality preserved, audio re-encoded so your editor opens it.
Why MKV files won't play everywhere
MKV (Matroska Video) is a container format popular with OBS Studio, HandBrake outputs, and scene releases. It supports almost any codec, which is great for archiving — but Windows Media Player, iPhones, many TVs, and several video editors won't touch it. The fix is usually trivial: the video inside is already H.264, which MP4 understands. You just need to swap the container.
This process is called a remux. No re-encoding happens: the video and audio streams are copied directly into an MP4 wrapper. It's essentially instant for files of any size, and there's no quality loss at all.
The OBS/Premiere audio problem
OBS records MKV with PCM audio by default — uncompressed and enormous. When you import that MKV into Premiere or DaVinci Resolve, the audio either refuses to load or appears as a separate track that won't link to the video.
A remux to MP4 re-encodes the audio as AAC (the standard for MP4) while copying the video frame-for-frame. The result opens correctly in every major editor.
Client-side, nothing uploaded
The remux runs entirely in your browser. A 10 GB MKV never has to travel over your internet connection — it's processed locally and you download the result directly from memory.
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Frequently asked questions
Does converting MKV to MP4 reduce quality?
No. A remux copies the video stream without re-encoding — every pixel is identical to the original. Only the audio may be re-encoded (PCM to AAC), which is lossless at standard quality settings.
How fast is the conversion?
A remux is much faster than a re-encode because the video is not decoded. A 1 GB MKV typically converts in under 10 seconds on a modern machine.
What if my MKV uses HEVC or AV1 video?
HEVC (H.265) and AV1 can be remuxed to MP4 without re-encoding, but playback on older devices may still fail if they don't support those codecs. For maximum compatibility, a full transcode to H.264 is needed — that feature is on the roadmap.
Can I convert a 10 GB MKV?
In theory yes — nothing is uploaded. In practice, very large files may hit browser memory limits. Chrome on a machine with 16 GB+ RAM handles multi-gigabyte files comfortably.