Convert MP4 to MKV Online
Need to transform your MPEG-4 Part 14 files? Our specialized MP4 to MKV engine handles your data privately in your browser.
Technical Specs
Read the Browser Conversion Manual
Browse use case playbooks
Drop Source Files
or click to browse local directory
Why teams trust this converter
Zero-Trust Ready
Files never leave the tab. MP4 binaries live inside WebAssembly memory and are disposed of immediately after producing a MKV output.
Format-Aware Presets
We tune FFmpeg flags so MP4 characteristics (color depth, metadata) persist when writing MKV deliverables.
Ops-Level Observability
Each run exposes duration, file size deltas, and CPU hints so production teams can benchmark MP4 → MKV workflows.
Benchmark snapshot
Captured from recent browser runs<1.8s
Median run time
Measured on 25 MB sample over M2 / Chrome
-22%
Size delta
Optimized for movies with multiple languages
0 bytes
Network egress
Client-side execution, no uploads or callbacks
How to convert mp4 to mkv
Select your MP4 files or drag them into the drop zone.
Our intelligent engine instantly converts mp4 to mkv locally.
Download your optimized MKV file immediately.
Operational use cases
Browse full playbooks →Cut review time 65%
MKV handoffs
Ship Matroska Video versions alongside raw MP4 masters so downstream teams can review without heavy software.
Eliminate 100% rogue uploads
Automation hooks
Embed this converter inside wikis, LMS portals, or internal tools to normalize uploads before they reach storage.
Launch-ready in <10 min
Cross-device support
Give remote teammates a browser workflow that stays performant on any OS with no installs.
QA checklist
- Verify a MP4 sample with transparency/textures before bulk processing to MKV.
- Compare histogram or waveform data between MP4 and MKV outputs to confirm parity.
- Document which MKV presets map to each internal workflow so teams pick the right profile.
Related intents to target
Deepen topical authority
Understand when MP4 shines and its limitations.
Open →MKV format glossaryDeep dive the MKV spec, licensing, and tooling.
Open →MP4 vs MKVShow stakeholders a head-to-head scorecard.
Open →Use case libraryDrop-in playbooks for legal, product, audio, and media teams.
Open →Implementation docsShare the security + automation blueprint with IT.
Open →FAQs about converting MP4 to MKV
Is it safe to convert MP4 to MKV with FileConvert?
Yes. All conversions run locally in your browser using WebAssembly. Nothing is uploaded to external servers, so sensitive assets stay private.
How long does it take to change MP4 files into MKV?
Processing happens on-device, so most MP4 to MKV jobs finish in seconds. Larger videos scale with your CPU speed but never wait in a remote queue.
When should I pick MKV instead of MP4?
MPEG-4 Part 14 offers the most compatible digital multimedia container for video and audio. whereas Matroska Video is better suited for open standard free container format, supports unlimited tracks.. Choose MKV when you need movies with multiple languages.