M4V → Twitter / X
Compress M4V for Twitter / X
Compressing M4V for Twitter / X comes down to three constraints: Twitter / X's 512 MB cap, its 1920:1200 resolution ceiling, and the need to output MP4 H.264 for reliable inline playback. M4V source files are typically 1080p (identical to MP4 when not DRM-protected) at around 100 MB per minute — right at Twitter / X's 500 MB target. We calculate a per-clip bitrate budget from your duration, subtract 128 kbps for audio, and allocate the remainder to H.264 video at the highest quality that fits. Non-DRM M4V is structurally identical to MP4; the extension change is essentially a rename. FairPlay-protected M4V (iTunes purchases) cannot be compressed. Twitter / X plays M4V most of the time, but edge cases (older clients, stricter servers) can fall back to 'unsupported file' — MP4 output avoids that entirely.
Where do you want to share your video?
How to compress M4V for Twitter / X
- 1Drag your .m4v file onto the upload zone above (or browse to it).
- 2Twitter / X is already selected — we'll target 500 MB to stay safely under the 512 MB cap.
- 3Optionally trim to a highlight clip or switch to H.265 for 30-50% smaller files at the same quality.
- 4Download the compressed MP4 and share it on Twitter / X. Source file auto-deletes from our servers after 1 hour.
What to know about M4V → Twitter / X
- Non-DRM M4V is structurally identical to MP4; the extension change is essentially a rename. FairPlay-protected M4V (iTunes purchases) cannot be compressed.
- Resolution is kept at up to 1920p when the bitrate budget allows.
- Trim to the highlight before you compress — every 10 seconds you cut gives remaining frames more bitrate to work with.
- Twitter / X's 500 MB target leaves a 5% safety margin below its 512 MB hard cap, so platform-side rejection is never an issue.
The compression math
A 1-minute M4V at 1080p (identical to MP4 when not DRM-protected) = ~100 MB. Twitter / X's 500 MB target minus 128 kbps audio = ~69777 kbps video budget. H.264 at that budget kept at up to 1920p when the bitrate budget allows produces a file at the target size that plays inline on Twitter / X.
About M4V files
M4V is Apple's video format used by iTunes purchases, Apple TV+ downloads, and some Apple device exports. It is technically identical to MP4 but may include Apple's FairPlay DRM (digital rights management) protection. Non-DRM M4V files can be compressed and converted by CompressYourVideo.com just like any MP4, and the compressed output plays on every device. DRM-protected M4V files (purchased from iTunes) cannot be converted by any online tool without first removing the DRM, which is a separate process. If you have M4V files from screen recordings or personal exports (not iTunes purchases), they will compress without any issues.
About Twitter / X
Compress videos for Twitter/X. Twitter's free tier allows up to 512MB, but videos must be under 2 minutes 20 seconds. X Premium users get 16GB and longer duration.
Related compression tools
Or compress M4V for a different platform