Convert MP4 to MKV on Mac
Convert MP4 files to MKV format on your Mac with Jollycat. The most widely supported video format. Container for H.264/H.265 video with AAC audio. Works on every device. All processing runs locally on your Mac — no cloud processing and no uploads required for conversion.
MP4 vs MKV
| Property | MP4 | MKV |
|---|---|---|
| Type | container | container |
| Compression | H.264/H.265 + AAC | Any codec |
| Container | Yes | Yes |
| Common Codecs | H.264, H.265, AAC, MP3 | H.264, H.265, VP9, AV1, FLAC, AAC, DTS |
| File Extension | .mp4 | .mkv |
| Key Advantage | Universal device compatibility | Supports any codec |
How to Convert MP4 to MKV on Mac
Open your MP4 file
Drag and drop your .mp4 file onto the Jollycat icon in your macOS dock or menu bar. Jollycat instantly detects the format.
Choose MKV as output
Select MKV from the conversion options. Adjust quality settings, bitrate, or resolution if needed.
Convert and save
Click Convert and Jollycat processes the file instantly on your Mac. No uploads required, no waiting — everything runs locally on Apple Silicon.
When to Convert MP4 to MKV
MKV advantages
Supports any codec. Multiple audio/subtitle tracks.
MP4 limitations
Patent-encumbered codecs. Not ideal for editing.
Common use cases
High-quality video storage, Movies with subtitles, Multi-track media.
MP4 to MKV Conversion Tips
Use Jollycat's trim and crop tools to edit your video before converting. This saves time by only processing the parts you need.
For sharing online, MKV with H.264 codec provides the best balance of quality and compatibility.
MKV is a flexible container that can hold virtually any video, audio, and subtitle codec combination.
Frequently Asked Questions
Is the MP4 to MKV conversion free?
Jollycat is a one-time purchase for $9.99. Once purchased, you can convert MP4 to MKV and use all 1,650+ conversion paths with no limits.
Does converting MP4 to MKV require an internet connection?
No. Jollycat processes everything locally on your Mac. Your MP4 files never leave your device — all conversion happens offline using Apple Silicon.
Can I batch convert multiple MP4 files to MKV?
Yes. Drag multiple MP4 files onto Jollycat and convert them all to MKV at once. Batch processing is built in.
Ready to Convert MP4 to MKV?
Jollycat handles MP4 to MKV conversion and 1,650+ other format conversions. All offline on your Mac.
Get Jollycat for Mac