Video ToolsFree

MKV to MP4

Convert MKV (Matroska) video files to MP4 format for broader device compatibility. MKV is excellent for archiving but isn't supported natively on iPhone, Apple TV, or many Smart TVs. MP4 works everywhere. Video stream is copied without re-encoding when possible. No signup.

Drop your video anywhere, click to browse

MP4, MOV, AVI, MKV, WebM, FLV, WMV, VOB

Ctrl+Vto paste a copied file

Frequently Asked Questions

Is video quality lost converting MKV to MP4?▼
No — when the MKV's video track uses H.264 or H.265, the stream is copied directly into the MP4 container without re-encoding. Zero quality loss.
Are subtitles preserved in the MP4 output?▼
MP4 has limited subtitle support. SRT subtitles can be embedded, but complex subtitle formats (ASS, SSA) used in many MKV files are not included in the output.
Are multiple audio tracks preserved?▼
The default (primary) audio track is included. MP4 supports multiple audio tracks but the additional MKV tracks may not transfer automatically.
Why doesn't MKV play on iPhone or Apple TV?▼
Apple devices only support QuickTime-compatible containers natively: MP4 and MOV. MKV is not in Apple's supported formats list, so third-party apps are required.
Is the conversion done in the browser?▼
Yes. FFmpeg WebAssembly handles MKV to MP4 conversion locally. No file is uploaded.