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Convert MP4 to MKV

Free online MP4 to MKV converter. Fast, secure, no signup required.

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Accepted: MP4 files · Max 100 MB per file

mp4 mkv

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Need to convert MP4 to MKV? MegaConvert makes it easy. Upload your MPEG-4 Part 14 (MP4) file and get a Matroska Video (MKV) file in seconds — no software to install, no signup required. Whether you need this conversion for social media, video editing, device compatibility, web streaming / archival, our online converter handles it instantly. Free for files up to 25MB, with support for larger files up to 2GB.

How to Convert MP4 to MKV Online

  1. 1
    Upload your MP4 file

    Click the upload area or drag and drop your MP4 file. Files up to 25MB are free. Larger files are supported with pay-per-use.

  2. 2
    Choose MKV as output format

    MKV is automatically selected on this page. You can adjust conversion settings if needed.

  3. 3
    Click Convert

    Hit the Convert button to start processing. Your file will be converted using our high-performance servers.

  4. 4
    Download your MKV file

    Once conversion is complete, click Download to save your new MKV file. Free files are available for 1 hour.

Why Convert MP4 to MKV?

  • **Reduce file size** — Converting between formats can significantly reduce file size, making files easier to share via email or cloud storage.
  • **Software requirements** — Your software or platform may require MKV format specifically. Converting ensures full compatibility.

MP4 vs MKV — Format Comparison

Feature MP4 MKV
Full Name MPEG-4 Part 14 Matroska Video
Developer Moving Picture Experts Group (MPEG) Matroska (Steve Lhomme)
First Released 2001 2002
Category Video Video
Extension .mp4 .mkv
MIME Type video/mp4 video/x-matroska

Re-encoding video may reduce quality. Use MKV for lossless container conversion.

About MP4 Format

Most widely used video container format supporting H.264, H.265, and multiple audio codecs.

Full name: MPEG-4 Part 14

Developer: Moving Picture Experts Group (MPEG) (2001)

About MKV Format

Open container format supporting virtually any video, audio, and subtitle codec.

Full name: Matroska Video

Developer: Matroska (Steve Lhomme) (2002)

Frequently Asked Questions

Upload your MP4 file to MegaConvert.io, select MKV as the output format, and click Convert. Your converted file will be ready to download in seconds. No software installation required.
Yes! Files up to 25MB can be converted for free, up to 3 times per day. For larger files, pay-per-use pricing starts at just $2 for files up to 100MB.
Absolutely. All uploaded files are encrypted in transit (HTTPS), scanned for viruses, and automatically deleted after conversion. We never share or access your files.
Free users can convert files up to 25MB. Pay-per-use supports files up to 2GB. Subscribers get up to 2GB with priority processing.
Most widely used video container format supporting H.264, H.265, and multiple audio codecs. Developer: Moving Picture Experts Group (MPEG) (2001).
Open container format supporting virtually any video, audio, and subtitle codec. Developer: Matroska (Steve Lhomme) (2002).