M4V to MKV Converter
Convert M4V to MKV using your browser's own media codecs — no upload, no watermark, no size limit. Drop a M4V file below — the whole conversion runs on your device.
Drop files, or click to browse
M4V files only — processed one at a time
Frequently asked questions
Is this M4V to MKV converter free?+
Yes, with no watermark and no account. The engine runs locally in your browser, so there's no server queue limiting usage.
Is my video uploaded to a server?+
No. Orbfile uses your browser's own built-in media codecs (via the WebCodecs API and Mediabunny), so encoding happens entirely on your device.
How long will it take?+
It depends on your device and the video's length and resolution — expect roughly real-time to a few times real-time for typical clips.
Is there a maximum file size?+
There's no fixed upload limit — since everything runs on your device, the practical limit is your browser's available memory, which handles typical clips and even fairly long recordings without issue.
How do I convert M4V to MKV?+
Drop your M4V file into the box above — Orbfile re-encodes it to MKV using your browser's own codecs and gives you a download link when it's done.
About M4V and MKV
What is M4V?
M4V is Apple's video variant of the MP4 container, used by iTunes for movies and TV show downloads.
Full M4V format guide →What is MKV?
MKV (Matroska) is a flexible open container that can hold multiple audio tracks, subtitles, and chapters alongside the video.
Full MKV format guide →The short version: MKV gives you supports multiple audio/subtitle tracks in one file, which helps once you run into M4V's biggest limitation: occasionally needs converting for non-Apple video players. It's a natural move when your video is headed toward archiving video with multiple language tracks or subtitles.
How it works
- 1
Drop your file in
Drag your video onto the box above, or click it to browse — there's no account to create and no upload to wait on.
- 2
Pick your settings
The output format is already set for this page — just adjust any extra options shown, if there are any.
- 3
Download the result
Your browser processes everything locally and hands you a download link the moment it's done — nothing was ever sent to a server.
Is it private?
Everything happens locally, inside this browser tab. Your video is read from disk, processed with WebAssembly running on your own device, and handed back to you as a download — it's never transmitted anywhere, so there's nothing to intercept and nothing stored on a server.
Common use cases
- Archiving video with multiple language tracks or subtitles
- Uploading a clip to social media
- Sending a video over email or chat
- Freeing up storage on a phone or laptop
Supported formats
This is one of many pairings the video toolkit handles. In total it covers:
Related conversions
Format details
About M4V files+
M4V is Apple's video variant of the MP4 container, used by iTunes for movies and TV show downloads.
M4V is, structurally, almost identical to MP4 — Apple created the distinct extension mainly to mark content sold or rented through iTunes, occasionally with added copy protection (FairPlay DRM) for purchased movies and TV shows. Because it shares MP4's underlying structure, unprotected M4V files play in nearly anything that reads MP4; the friction only shows up with DRM-protected downloads, which are tied to an Apple account.
How to open a M4V file
Opens readily in QuickTime Player, iTunes/Apple TV app, Most modern media players. For real editing, use Final Cut Pro, Adobe Premiere Pro.
Good for
- plays natively in Apple's ecosystem
Watch out for
- occasionally needs converting for non-Apple video players
About MKV files+
MKV (Matroska) is a flexible open container that can hold multiple audio tracks, subtitles, and chapters alongside the video.
Matroska was designed from the ground up as an open, extensible container, meaning a single MKV file can bundle several audio tracks (say, multiple languages), several subtitle tracks, and chapter markers, all switchable during playback — something older containers like AVI and even MP4 handle less gracefully. That flexibility made it the format of choice for archiving TV shows and films with multiple language options, though a handful of phones and streaming devices still expect MP4 and need MKV converted first.
How to open a MKV file
Opens readily in VLC Media Player. For real editing, use DaVinci Resolve, Adobe Premiere Pro (with an extension).
Good for
- supports multiple audio/subtitle tracks in one file
- open format, no licensing fees
Watch out for
- not natively supported by some phones and TVs without an app
Need a different format? Try the full Video Converter, or explore all video tools.