MKV Video Converter

Convert to/from MKV

Work with MKV Matroska containers. Supports multiple audio tracks, subtitles, and chapters.

Multiple audio tracks Subtitle support High quality

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Up to 100MB free • Output Format: MKV, MP4

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Files deleted in 2h

Fast Processing

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Blazing Fast

How to Convert

Convert any file in seconds — no software, no sign-up required.

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Upload your audio file

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Why EasyConv

Why Use EasyConv

Professional-grade conversion with features designed for real-world workflows.

All Major Formats

Supports all popular formats.

Powered by FFmpeg

Based on proven FFmpeg libraries.

Chapter Markers

MKV natively supports chapter markers, enabling navigation within long videos like movies, documentaries, and lecture series.

Preserves Metadata

Metadata and tags are preserved.

Future-Proof Format

MKV is an open standard maintained by the Matroska organisation. It supports current codecs (H.265, AV1) and will continue to evolve without proprietary restrictions.

Secure Processing

Files are processed securely.

300+ Formats

Supported Formats

Detailed breakdown of every format supported by this converter.

Format	Description	Extension	Use Case
MP4 → MKV	Move MP4 content into flexible MKV	`.mp4`	Home theatre libraries, Plex/Kodi
AVI → MKV	Upgrade legacy AVI to modern MKV	`.avi`	Archiving old video collections
MOV → MKV	Apple QuickTime to open MKV	`.mov`	Cross-platform media server storage
WEBM → MKV	Open web format to MKV container	`.webm`	Combining web downloads into a library
WMV → MKV	Windows Media to cross-platform MKV	`.wmv`	Migrating Windows media libraries
FLV → MKV	Legacy Flash video to modern MKV	`.flv`	Preserving old web video content
TS → MKV	Broadcast MPEG-TS to MKV container	`.ts`	DVB recordings, TV capture cards

3 Simple Steps

Frequently Asked Questions

Everything you need to know about this conversion tool.

MKV (Matroska Video) is an open container format that can hold virtually any video codec, audio codec, and subtitle format. It's popular because it's flexible, well-supported by media players, and not controlled by any corporation.

No. MKV is a container format (the "box"), while H.264 and H.265 are video codecs (the "content inside the box"). An MKV file can contain video encoded with H.264, H.265, AV1, or many other codecs.

Yes. If your input file uses a codec already compatible with MKV (H.264, H.265, AAC, etc.), you can select "stream copy" to remux the video without re-encoding — resulting in instant conversion with no quality loss.

Some smart TVs have limited codec support within MKV containers. If your TV supports H.264 MP4 but not H.265 MKV, convert the video to H.264 inside the MKV container, or use our MP4 Converter instead.

If your source file contains embedded subtitle tracks (e.g., from an MP4 with subtitle streams), they can be preserved in the MKV output. External SRT files cannot be added through this tool — use a dedicated muxing tool like MKVToolNix for that.

AVI is a 1990s format with limited codec support and no subtitle/chapter capabilities. MP4 is widely compatible but less flexible. MKV supports the widest range of codecs, multiple streams, and advanced features — making it ideal for archiving and home theatre.

12M+ users trust us

Who Uses This Tool

Real-world use cases from professionals across different industries.

Plex & Kodi Users

Media Server Libraries

MKV is the preferred format for Plex, Kodi, Jellyfin, and Emby. Direct play avoids server transcoding, saving CPU and bandwidth.

Video Archivists

Long-Term Preservation

MKV's open standard and multi-codec support make it the most future-proof container for archiving personal and professional video collections.

Subtitle Enthusiasts

Multi-Subtitle Films

Embed multiple subtitle tracks (English, French, Spanish) inside one MKV file and switch between them in any media player.

TV Recording Users

DVB & OTA Recordings

Convert TS (transport stream) files from TV capture cards to MKV for a cleaner container with the same quality and smaller overhead.

Multi-Audio Users

Multiple Audio Tracks

Store separate audio tracks (director's commentary, multiple languages) in one MKV file and choose between them at playback.

4K & HDR Watchers

HDR & Dolby Vision

MKV supports HDR10, HDR10+, Dolby Vision, and Dolby Atmos tracks — essential for premium 4K home theatre setups.

Why EasyConv

Comparison

See how we compare to other solutions

Feature	MP4 Format	AVI Format
Multiple audio tracks	Limited
Subtitle support	Limited
Chapter marker support
H.264, H.265 & AV1 codecs		Limited
Lossless
HDR metadata support
Open, non-proprietary standard

Technical Specifications

Detailed technical information about our conversion engine.

Limits

Max file size: 500 MB (free)
Max resolution: 4K (2160p)
Output: Matroska (.mkv) container

FFmpeg MKV Matroska H.264 H.265 AV1 Subtitles

Engine

FFmpeg 6.x · MKVToolNix-compatible output · libx264 / libx265

Quality

CRF 18–28 · stream copy for compatible source codecs

Speed

Remux speed for same-codec source · full encode < 90 s for 5-min 1080p

Security

HTTPS transfer · isolated temp dir · auto-purged in 2 h

Multi-track

Video + Audio + Subtitles

Chapters

Preserved from source

Max resolution

4K UHD (3840×2160)

Complete Guide

MKV Matroska Container: The Home Theatre Standard Explained

MKV (Matroska Video) is the format of choice for serious home theatre enthusiasts, media server operators, and digital archivists. Its open design, unlimited flexibility, and broad player support make it the premier container for any video that deserves more than the basics.

What Makes MKV Different from MP4?

While MP4 and MKV can both hold H.264 and H.265 video, they differ significantly in capability:

Audio tracks: MP4 supports limited multi-track audio; MKV supports unlimited tracks including DTS-HD, Dolby Atmos, and TrueHD.
Subtitles: MP4 supports limited subtitle formats; MKV supports SRT, ASS, PGS, and many more simultaneously.
Error recovery: MKV has superior error recovery — partial files can often still be played.
Chapters: Both support chapters, but MKV's implementation is richer and more commonly used.

Plex, Kodi, and Jellyfin: Why MKV Is the Media Server Format

Plex and Kodi both natively support MKV with H.264 and H.265 for direct play — meaning the file streams to your TV or client without any server-side transcoding. Transcoding burns CPU, introduces lag, and downgrades quality. Keeping your library in MKV format avoids this entirely.

Plex recommends MKV with H.264 or H.265 and AAC or AC3 audio for the broadest client compatibility across Smart TVs, Rokus, and Fire Sticks.

MP4 to MKV: When to Use Remux vs Re-encode

If your MP4 already uses H.264 or H.265 video, converting to MKV can be done as a remux — the video data is moved to the MKV container without touching a single frame. This is lossless, instant, and the correct choice in nearly all cases.

Re-encoding is only needed when you want to change the codec (e.g., H.264 → H.265) or when the source audio uses a format incompatible with MKV (rare).

Embedding Subtitles in MKV

One of MKV's most valued features is soft-subtitle embedding — storing subtitle text inside the container so media players can toggle them on/off at will. SRT, ASS, and VTT subtitle tracks can all coexist inside a single MKV file.

This is a major advantage over MP4, which has limited support for embedded subtitles. For workflows requiring subtitle embedding alongside video conversion, MKV is the professional choice.

MKV for 4K HDR: The Technical Advantage

4K HDR video requires a container that can carry HDR metadata (HDR10, HDR10+, Dolby Vision) alongside the video stream. MKV fully supports all HDR formats, making it the standard container for 4K Blu-ray rips and HDR home theatre files.

For HDR content, always use MKV with H.265/HEVC — it's the only combination that preserves the full HDR colour grading and dynamic range intended by the filmmakers.