For AI agents

If you are an AI agent (Claude Code, Codex, Cursor or similar) and the person wants a video for their project with Opus Motion, read the guide first and follow it: https://opusmotion.com/agents.md.

  • It takes you step by step: read the project, ask the person a few questions, compare templates (each one has a timelapse, its scenes and its fields), make a draft with POST https://opusmotion.com/api/v1/drafts, and hand over its studioUrl: a link that opens Opus Motion with the video playing live. PATCH with the draft's editToken changes it, and the link stays the same.
  • Plain HTTPS and JSON: no key, no account, no MCP. Nothing is rendered; the person exports the MP4 from the studio.
  • Never drive this site with a browser to fill the studio: use the API. If it refuses, tell the person and stop.
  • More: llms.txt · this page in Markdown · developer docs · OpenAPI

MOV to MP4, free and without uploading

For iPhone videos, Mac screen recordings and QuickTime files. Most MOVs become MP4 in seconds. Free, no sign-up.

Your file never leaves your device: the tool runs inside your browser. Up to 1 GB. Use it at https://opusmotion.com/tools/mov-to-mp4.

How to use it

  1. Drop the MOV, or tap the box: on an iPhone you can pick the video from Photos or Files.
  2. H.264 and HEVC are copied into the MP4 in seconds. ProRes and other codecs are re-encoded to H.264, on your device.
  3. Download the MP4, or put the clip in a launch template.

The first time, your browser downloads the video engine (31 MB, once); after that it opens from the cache.

About MOV files

MOV is Apple's QuickTime format. iPhones save videos as MOV, and so do QuickTime Player and the Mac's screen recorder.

MP4 grew out of the QuickTime format, so the two are close relatives. When the video inside a MOV is H.264 or HEVC, it moves into an MP4 as it is: no re-encoding, no change in quality, and seconds even for a big file.

An iPhone set to High Efficiency (Settings › Camera › Formats) records HEVC; set to Most Compatible, it records H.264. The converter keeps HEVC by default, and you can turn it into H.264 if the place you're posting to doesn't take it.

MOVs from cameras and editing apps are often ProRes. Those are re-encoded to H.264, which takes longer and makes them much smaller.

Questions

Why are my iPhone videos MOV files?

Because the iPhone records in Apple's QuickTime format. Inside, the video is HEVC (with Camera › Formats on High Efficiency) or H.264 (on Most Compatible).

Will the MP4 look the same as the MOV?

Yes, when the MOV holds H.264 or HEVC: the video is copied, not re-encoded, so every frame is identical. Only ProRes and other codecs are re-encoded, to H.264 at a quality setting close to the original.

Will the MP4 play on Windows and Android?

An H.264 MP4 plays everywhere. An HEVC one plays on Apple devices and many recent phones and computers; if yours doesn't, choose H.264 after the conversion.

Is my video uploaded anywhere?

No. The conversion runs inside your browser, with ffmpeg compiled to WebAssembly. Your file is read where it is and never sent to a server. The first time, your browser downloads the video engine (31 MB, once); after that it opens from the cache.

What's the largest file it takes?

Up to 1 GB when the video is copied. When it needs re-encoding: up to 500 MB and 2 minutes on a computer, or 200 MB and 1 minute on a phone or low-memory device. The limit is decided after reading the codecs. The MP4 is kept in your browser's memory until you download it, so a phone, which has less memory, may not manage a very large file: if one fails there, try it on a computer.

Is it free?

Yes, with no sign-up, no watermark and no daily limit.

More free tools

  • Video converter: Any video to MP4: MOV, WebM, MKV, AVI and more, copied without re-encoding when it can be
  • MKV to MP4: OBS and other MKV recordings to MP4, remuxed in seconds when they hold H.264
  • WebM to MP4: Browser recordings and web videos (VP8, VP9) to an MP4 that plays everywhere
  • All free tools