About MP4 (MPEG-4 Part 14)
MP4 is the closest thing video has to a common language. Standardized in 2001 on the foundations of Apple’s QuickTime format, it became the default answer to “what file do I send?” — phones record to it, TVs and consoles play it, browsers stream it, editors import it, and upload forms whitelist it. When someone says “just send me the video”, they mean an MP4.
Technically, MP4 is a container rather than a compression method: it is a box holding video and audio streams that were compressed by codecs. That distinction matters in practice — an MP4 usually holds broadly-supported video, which is why this converter deliberately refuses to stuff web-only video into an MP4 shell. A file that calls itself MP4 but won’t play on an iPhone is worse than no conversion at all.
Converting to MP4 here is often lossless: if your MOV, MKV, or WebM already holds MP4-compatible video, the streams are repackaged without re-encoding — near-instant, with a “lossless” tag to prove it. When re-encoding is genuinely needed, you control quality, resolution, frame rate, and trimming, all in your browser with nothing uploaded.
Strengths
- Plays on effectively every device, platform, player, and website in use today
- Streams well: built for progressive playback and fast-start on the web
- Holds modern efficient video (H.264, HEVC, AV1) alongside universal audio
- Often converts losslessly from MOV and MKV — a container swap, not a re-encode
- The safe choice for sharing when you don’t control the recipient’s device
Limitations
- Compression efficiency depends entirely on the codec inside — the box itself saves nothing
- Weak support for multiple audio tracks and soft subtitles compared to MKV
- Some MP4 video (HEVC) still trips up older devices despite the familiar extension
- Patent-encumbered codecs are common inside MP4, unlike fully open WebM