Convert M4V to MP4
Apple's video extension, relabeled for everything else — an instant repack on your own device, with zero quality loss.
Drop your video or audio here
or
MP4, MOV, WebM, MKV, AVI, MP3, WAV and more — any size, no upload
🔒 Files never leave your device — everything runs in your browser.
M4V is the extension Apple puts on MP4 video — iTunes purchases, old iPod-era rips, some Mac exports. The data inside is regular MP4, but plenty of software judges a file by its extension: upload forms reject it, editors refuse to import it, TVs skip it entirely. Converting to .mp4 removes that friction for good.
Because the two formats share the same container, this conversion is a repack, not a re-encode: the tool copies the video and audio streams into a fresh MP4 file in seconds, bit-for-bit, with zero quality loss. Nothing uploads — the file is read and rewritten entirely on your device.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Convert
Compatible files are repackaged instantly with zero quality loss; others are hardware-transcoded at high quality.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
Is there any quality difference between M4V and MP4?
None. M4V is MP4 with a different extension, and this conversion copies the streams without touching them — the output is the same video, byte for byte, in a file everything accepts.
Why does the conversion finish almost instantly?
Because nothing is re-encoded. The video and audio inside an M4V are already MP4-compatible, so the tool just repacks them into a new container — that is file copying, not video processing.
My iTunes movie won't convert — why?
Films and TV purchases from iTunes carry FairPlay copy protection, and protected files cannot be read by any converter. Home videos, screen recordings, and unprotected M4V files convert without issue.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.