M4V to MP4 Converter
Convert M4V videos from iTunes, Handbrake and Apple devices to standard MP4 — instantly and with no quality loss when the video is H.264 — keeping chapters, audio tracks and subtitles, or re-encode with full control over quality, bitrate, frame rate, resolution and audio.
Also: MKV to MP4 converter · AVI to MP4 converter · MOV to MP4 converter · WebM to MP4 converter · FLV to MP4 converter · TS to MP4 converter · WMV to MP4 converter · MPEG to MP4 converter · 3GP to MP4 converter · MOD to MP4 converter · VOB to MP4 converter · MTS to MP4 converter · OGV to MP4 converter · RM/RMVB to MP4 converter · MXF to MP4 converter · MP4 compressor · Video to MP3 extractor · MP4 to GIF converter · Video format converter
Click to choose a video, or drag and drop
Choose an M4V file — MKV, AVI, MOV, WebM, TS, FLV and most other formats are accepted too. Stays on your device.
Your video is converted entirely in your browser and is never uploaded. The converter engine (ffmpeg, ~32 MB) is downloaded once and cached by your browser.
Frequently asked questions
What is the difference between M4V and MP4?
M4V is Apple’s variant of MP4. Inside, an unprotected M4V usually holds the same H.264 video and AAC audio as an MP4, so converting is just a repackage that takes seconds and loses no quality. Some Windows players, TVs, Android apps and editors only recognise the .mp4 name, which is why converting helps.
Why won’t my iTunes M4V file convert?
Movies and TV shows bought or rented from iTunes are protected with Apple FairPlay DRM. They are encrypted and cannot be converted by any tool without Apple’s license. Only unprotected M4V files, such as videos exported from Handbrake or recorded on your own device, can be converted.
Are chapters, audio tracks and subtitles kept?
Yes. Chapters are kept, you can choose which audio track goes into the MP4, and text subtitles are converted to the MP4 text format (or saved as a separate .srt file). Picture-based subtitles and closed-caption data tracks cannot be carried over.
Is my video uploaded anywhere?
No. The conversion runs entirely in your browser using ffmpeg compiled to WebAssembly. Your video never leaves your device. Only the converter engine itself (about 32 MB) is downloaded, once, and cached by your browser.
What is Fast remux and when should I use it?
A M4V file is just a container. If the video inside is H.264 (or another format MP4 supports) and the audio is AAC, MP3 or AC-3, those streams can be moved into an MP4 container as they are. That takes seconds and loses no quality at all. The tool checks your file and picks this automatically when it is possible.
What do CRF and bitrate mean?
CRF (constant quality) lets the encoder spend as many bits as each scene needs: lower numbers mean better quality and bigger files, around 18 looks near-lossless, 23 is the default and 28 is noticeably smaller. A target bitrate instead aims for a fixed number of kilobits per second, which gives a predictable file size but variable quality.
Why is re-encoding slow, and is there a size limit?
Re-encoding runs on a single CPU thread inside the browser (H.264 only), so it is usually near real-time speed or slower for HD. The finished MP4 also has to fit in browser memory, which in practice limits output to roughly 1 to 2 GB. For a long movie, use Fast remux, trim it, or copy the generated command and run it with ffmpeg on your own computer.
What happens to subtitles?
MP4 supports text subtitles only. SRT, ASS/SSA and WebVTT tracks are converted to the MP4 text format, and you can also save a track as a separate .srt file. Picture-based subtitles from Blu-ray or DVD (PGS, VobSub) cannot be converted.