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MP4 vs MOV vs WebM

Updated October 11, 2026

Quick answer

MP4 is the safest choice for sharing because almost every phone, browser and app plays it; MOV is Apple’s QuickTime format, common for iPhone and professional footage; WebM is an open web format used by browsers and screen recorders. All three are containers, so the codec inside matters as much as the file extension.

Containers vs codecs

MP4, MOV and WebM are containers: wrappers that hold a video stream, an audio stream and metadata. The actual compression is done by codecs such as H.264, HEVC (H.265), VP9 or AV1 for video, and AAC or Opus for audio. Two files with different extensions can contain identical H.264 video, and two MP4s can behave very differently if one uses H.264 and the other uses HEVC.

The three formats at a glance

  • MP4 (MPEG-4 Part 14): the universal format. Usually H.264 or HEVC video with AAC audio. Plays on practically every phone, computer, smart TV and browser, and most platforms recommend it.
  • MOV (QuickTime): Apple’s format, which MP4 was derived from. iPhones record MOV files, usually with HEVC or H.264, and pro cameras and editors use it for ProRes. Works everywhere Apple software runs and in most modern players.
  • WebM: an open, royalty-free format based on Matroska, with VP8, VP9 or AV1 video and Vorbis or Opus audio. Common for browser recordings, screen recorders and web video. Support outside browsers, especially in Apple apps and some messengers, is weaker.

Which formats apps and platforms accept

  • WhatsApp: 3GP, AVI, FLV, MKV, MOV and MP4. No WebM.
  • Discord: lists MP4 (H.264, HEVC or AV1 video) and MOV among the most common file types.
  • TikTok: MP4, WebM and MOV, with MP4 and H.264 recommended in its developer documentation.
  • Instagram: Meta’s publishing specs list MP4 and MOV.

If you want one file that works everywhere, MP4 with H.264 video and AAC audio is the safest bet.

HEVC video can need extra support on some systems. On Windows, playing HEVC may require Microsoft’s HEVC Video Extensions, and not every browser can preview it.

Converting between them

Moving from MOV to MP4 is usually a remux: the H.264 or HEVC video and AAC audio fit in either container, so FFmpeg can rewrap them without re-encoding or losing quality:

ffmpeg -i input.mov -c copy output.mp4

WebM to MP4 is different. VP9 or AV1 video and Opus audio aren’t widely supported inside MP4, so for broad compatibility you re-encode to H.264 and AAC. This takes longer and loses a little quality:

ffmpeg -i input.webm -c:v libx264 -crf 20 -c:a aac output.mp4

Renaming a .mov to .mp4 sometimes plays, but it isn’t a real conversion and can confuse apps. ProRes MOV files are best kept as MOV or exported to H.264 from your editor.

Which one should you use

  • Sharing with people or posting to social apps: MP4 with H.264 video and AAC audio.
  • Keeping iPhone originals or editing on a Mac: leave them as MOV. Converting gains nothing unless an app refuses the file.
  • Embedding video on a website or recording in the browser: WebM is fine, but keep an MP4 version for anyone who needs to download or forward it.

Questions and answers

Is MOV better quality than MP4?

Not by itself. Quality depends on the codec and bitrate, not the container. An H.264 video looks the same in a MOV or an MP4. MOV files can hold ProRes, which is higher quality but much larger.

Can I rename a .mov file to .mp4?

It sometimes works because the formats are related, but it isn’t a proper conversion. Remux with FFmpeg (-c copy) instead. It takes about as long as copying the file and produces a correct MP4.

Why won’t my WebM video play on my phone or in a messenger?

Some apps, especially on older iPhones and in messengers like WhatsApp, don’t support WebM. Converting it to MP4 with H.264 video and AAC audio is the reliable fix.