🎬 Video Converter

MKV to MP4 Converter — Free & Private

MKV is the power-user format for high-quality movies and Blu-ray rips — but iPhones, Apple TV, PlayStation, and most streaming apps won't play it. Convert to MP4 with zero quality loss. Most MKV files are just a container swap, not a re-encode. No upload, ever.

⚡ Convert MKV to MP4 Now Browse All Tools

✓ Free forever ✓ No upload ✓ No quality loss ✓ FFmpeg-powered

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Ready to make your MKV universally playable?

100% in your browser · Zero quality loss remux · Files never leave your device

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Why MKV Files Won't Play on Most Devices

MKV (Matroska Video) is the container of choice for high-quality movie downloads, Blu-ray rips, and anime collections — because it supports multiple audio tracks (English, Japanese, commentary), subtitle streams (multiple languages), chapters, and 4K video all in a single file. But consumer electronics largely ignore it. The iPhone, iPad, Apple TV, and AirPlay all refuse MKV files. PlayStation and Xbox handle MKV via USB but not through streaming apps or screen mirroring. The good news: the video inside most MKV files is already H.264 or H.265 — the same codec MP4 uses. Converting MKV to MP4 in these cases is a simple container swap (remux), not a re-encode. There is zero quality loss, and large files convert in minutes rather than hours.

📱 iPhone & AirPlay compatible — MP4 plays natively; MKV is blocked by iOS entirely
⚡ Near-instant remux — H.264/H.265 MKV files just change container, no re-encode needed
🎯 Zero quality loss — when remuxing, the video bitstream is copied byte-for-byte
📺 Chromecast & AirPlay ready — cast MKV movies to your TV after converting to MP4
🎮 Streaming app compatible — MP4 works in every video app, not just USB playback
🔒 100% private — FFmpeg.wasm processes locally; your movie files never leave your device

How to Convert MKV to MP4

Open the Converter

Click "Convert Now" to open the video converter with MKV → MP4 pre-selected.

Load Your MKV File

Drag & drop your MKV file or click Browse. Works with any MKV regardless of internal codec.

Convert in Browser

FFmpeg.wasm remuxes or re-encodes entirely in your browser. H.264/H.265 MKV converts in minutes.

Download MP4

Your MP4 downloads automatically — ready for iPhone, Apple TV, PS5, and every streaming app.

Features

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100% Private

FFmpeg.wasm runs locally. Your movie files never leave your device.

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Fast Remux

H.264/H.265 MKV files remux to MP4 in minutes with no quality loss.

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Free Forever

No account, no fee, no watermarks. Convert large movie files freely.

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Audio Tracks

Keeps the default audio track. Supports multiple audio streams in MKV.

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Universal Output

MP4 plays on iPhone, smart TV, PS5, Xbox, Chromecast, and every app.

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4K & HDR

Handles 4K and HDR MKV files with H.265 (HEVC) codec support.

Frequently Asked Questions

In most cases, yes. If the MKV contains H.264 or H.265 video, the conversion is a remux (container change only) — the video data is not re-encoded, so quality is perfectly preserved and conversion is very fast.

Subtitle handling depends on the subtitle type. Image-based subtitles (PGS/VOBSUB) cannot be embedded in MP4. Text subtitles (SRT) may be preserved. If you need subtitles, extract the SRT file from the MKV before converting.

MP4 supports multiple audio tracks, but the converter typically keeps the first or default track. If you need a specific language track, check the track settings before converting.

iPhone doesn't natively support the Matroska container format. Even if the video codec is H.264 (which iPhone supports), the MKV wrapper prevents playback. Converting to MP4 (same H.264 video, different wrapper) plays natively on iPhone.

If it's a remux (container change), conversion can take just a few minutes even for large files since no re-encoding is needed. Re-encoding large files can take 30–60+ minutes in a browser.

PS5 and Xbox Series X support MKV via USB, but streaming apps and AirPlay don't. Converting to MP4 gives guaranteed playback everywhere, including casting to Chromecast or AirPlay.

No. All conversion runs in your browser via FFmpeg.wasm. Your files never leave your device.