MOV vs MP4: what's the difference and when to convert

2 min read

You record a 2-minute video on your iPhone, send it to a colleague on Slack, and they reply: “I can’t open this.” The file is .mov. Their Windows laptop doesn’t have the right codec.

This is the most common reason people search for MOV to MP4 conversion. It’s a compatibility issue, not a quality one.

They’re both containers, not codecs

MOV and MP4 are container formats. They wrap video and audio streams that are encoded with codecs like H.264 or H.265. Think of them as the box, not the contents.

The contents are usually identical. An iPhone .mov file typically uses H.264 video and AAC audio. An .mp4 file uses the same codecs. The difference is in the box:

  • MOV was designed by Apple in the early 1990s for QuickTime. macOS and iOS handle it natively. Windows and Android need extra software.
  • MP4 is an international standard (ISO 14496-14) based on the same underlying technology. Every device, browser, and platform supports it.

When you should convert to MP4

  • Sending video to someone on Windows or Android
  • Uploading to a platform that rejects .mov (some form uploads, LMS portals, CMS systems)
  • Embedding in a web page (the HTML5 <video> tag expects .mp4 or .webm)
  • Posting on social media where MOV sometimes gets re-encoded more aggressively than MP4

When to keep the MOV

  • You’re editing in Final Cut Pro, Motion, or other Apple-native tools that prefer the QuickTime container
  • You want to preserve container-level metadata (timecodes, chapter markers) for post-production
  • Everyone involved is on macOS or iOS

How to convert

  1. Open the MOV to MP4 converter
  2. Drop your .mov file
  3. Download the .mp4

The conversion uses FFmpeg compiled to WebAssembly, running entirely in your browser. No file is uploaded. Processing speed depends on your device and the file size. A 100 MB clip takes 30-60 seconds on a modern laptop.

What happens to quality?

The video gets re-encoded during conversion. With H.264 at default settings, the quality difference is negligible for typical use cases: sharing, uploading, embedding. Side by side, you’d struggle to spot the difference.

If you’re archiving footage and need zero quality loss, consider using a tool like FFmpeg directly with the -c copy flag to remux without re-encoding. That’s outside the scope of a browser tool but worth knowing.

Try it yourself. Open the tool and convert your file in seconds. No upload, no signup.

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