free · in-browser · no upload
Drop your M4V file. We'll convert it to MP4 right here in your browser, your file never leaves your device.
Select your file here to get started
or drop your file here.
Accepts .m4v
How it works
Click the dropzone above or drag a M4V from your desktop. Files of any size, there's no upload, so there's no upload limit.
The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.
Get your MP4 the moment the conversion finishes. Convert another, or close the tab.
Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.
Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.
No account required. No watermark on the output. No queue. Drop a file, get a converted file.
Why convert M4V → MP4
M4V is Apple's MP4 variant from iTunes Store and old iOS recordings. The container is byte-compatible with MP4, but plenty of non-Apple editors and upload pipelines reject the extension on sight. Re-mux without re-encoding so it stays fast and lossless.
You have a .m4v screen recording from an iPhone and your editor refuses it. Convert to .mp4 here, drop into the editor, no quality loss.
Is this a re-encode?
No. We stream-copy the audio + video tracks into an MP4 container. The bytes inside are identical, only the wrapper changes. Conversion is fast and lossless.
Formats involved
M4V is a file format we support converting. Detailed format information is being added, for now, drop your file in the converter above and you'll get the conversion you came for.
How to open
Most operating systems open this format with a default application; if not, search for a free reader/viewer for the format.
MP4 is the dominant video container on the web, H.264 video plus AAC audio, in a structure designed for streaming. Every browser, mobile device, smart TV, and editing tool reads MP4. The format is technically a container (not a codec), so two MP4 files can have very different internal codecs, but the H.264+AAC default is what enables universal playback.
How to open
Every video player on the planet, VLC, QuickTime, Windows Media Player, browsers (HTML5 video), iOS, Android, smart TVs, game consoles. Universal.
You may also need
Related tools
FAQ
Yes. No signup, no watermark, no daily file count limit. Every conversion runs in your browser, your file never touches our servers because there are no servers.
Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.
Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.
File interchange. Web video, mobile video recording, video sharing. The most common reason to convert is compatibility, MP4 works in places where M4V doesn't, or vice versa.
Most operating systems open this format with a default application; if not, search for a free reader/viewer for the format.
Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.
Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.
