Convert MP4 to MKV
Repack MP4 video into MKV for advanced players and flexible archival workflows.
Free MP4 to MKV converter
AnyConv365 helps you convert MP4 files to MKV without installing software. Open this page, choose your file, and download the result.
MP4 is the most common shareable video container. Convert into it from MOV/MKV/AVI for uploads, extract MP3 for audio-only, or convert to M3U8 when you need an HLS streaming package.
How it works
Is MP4 to MKV conversion free?
Yes. AnyConv365 lets you convert MP4 to MKV online for free with no account required.
Will my file quality be preserved?
We aim for the best practical fidelity for each pair. Preview the download before sharing when quality is critical.
Do you store my files?
Server-side source files are deleted immediately after a successful conversion. If conversion fails, the source file is retained for up to one hour for error diagnosis and then deleted automatically.
Does converting to MP4 always re-encode?
Often yes for maximum compatibility. Expect encoding time to follow clip length and device speed.
Why repack MP4 into MKV?
MKV is a flexible container for advanced players, subtitles, and archival workflows — not always smaller than MP4.
Where can I learn more about this conversion?
See our guide: Convert MP4 to M3U8 for HLS streaming. It covers when to convert, common pitfalls, and related formats.
Related conversions
Related guides
- Convert MP4 to M3U8 for HLS streaming
Turn MP4 video into an HLS M3U8 package (playlist + .ts segments in a ZIP) with AnyConv365.
- Convert MKV to MP4 for wider playback
Turn Matroska MKV videos into MP4 for phones, uploads, smart TVs, and the web using AnyConv365.
- Convert M3U8 to MP4 for offline playback
Turn HLS M3U8 playlists into a single MP4 for downloads, editors, and uploads with AnyConv365.
- Convert MOV to WebM for lighter web video
Turn iPhone MOV clips into WebM for faster self-hosted web playback with AnyConv365 in your browser.