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MOV to MP4

Details

How to use MOV to MP4

What the tool does, how to run it, and what to expect from the result.

How to convert MOV to MP4 locally

Drop a MOV in and the page decodes it inside your tab with a WebAssembly build of ffmpeg, then re-encodes to H.264 video and AAC audio in an MP4 written with the faststart flag so it can start playing before it has fully downloaded.

The point of the conversion is codec compatibility more than container compatibility. If the MOV came from an iPhone in High Efficiency mode, what actually changes is HEVC becoming H.264, and that is what makes the file open in editors and uploaders that were rejecting it.

  • Choose one MOV file or drop it onto the upload area.
  • Confirm the duration and resolution shown in the panel match the clip you expected.
  • Select a quality preset: Balanced (CRF 27) for anything you care about the look of.
  • Run the conversion and let the tab stay open until the download button appears.
  • Play the MP4 back once, checking orientation and audio sync, before sending it on.

Why a generic app launch draft can be more useful here

Alternative app stores and third-party marketplaces often have less standardized promo workflows. In practice, teams just need a clean, reusable short video draft from screenshots.

This page keeps the defaults generic on purpose, so the same local builder can adapt to different store surfaces without pretending to be an official platform tool.

What this page should help with

It is useful for launch drafts, screenshot storyboards, and short promo videos built from screenshots when the publishing destination is more flexible or mixed.

  • Generic app launch promo drafts
  • Alternative Android store visuals
  • Third-party marketplace screenshot videos
  • Local browser preview and export with no server rendering
Tips

Getting a better result out of MOV to MP4

Specific settings and thresholds, not general advice.

  • MOV and MP4 are both built on the same ISO base media file format, so a MOV that already holds H.264 and AAC could in principle be remuxed to MP4 with zero quality loss. This browser page does not do that: it re-encodes with libx264 at preset veryfast and CRF 27 on Balanced, 31 on Smaller file, 35 on Aggressive.
  • The usual reason a MOV will not play or upload is not the container, it is HEVC. iPhones set to High Efficiency record H.265 inside a .mov, and older editors and uploaders reject it. Converting here gives you H.264, which is the actual fix.
  • iPhone video also arrives with a rotation matrix rather than rotated pixels. The re-encode bakes the correct orientation into the frames, which is why a clip that appeared sideways in one app comes out upright everywhere after conversion.
  • A ProRes MOV out of a camera or Final Cut runs at hundreds of megabits per second, which is orders of magnitude more data than a WebAssembly encoder in a tab can chew through. Do that conversion on a desktop.
  • The audio track is re-encoded to AAC at 128 kbps. That is fine for dialogue and phone recordings, and it is not fine as an intermediate for a music mix you will edit further.
Limits

What MOV to MP4 does not do

The honest boundary, so you do not lose time finding it yourself.

  • No stream copy: even an already-H.264 MOV gets decoded and re-encoded, so the MP4 is one generation lossier than the source.
  • Only the first video track and one audio track are carried over. Timecode tracks, extra audio, and any QuickTime metadata are dropped.
  • Output is 8-bit 4:2:0 H.264. A 10-bit HDR iPhone clip (HLG or Dolby Vision) loses its HDR grade and gets flattened to SDR.
  • Large or long MOV files are impractical: the encoder is single-threaded WebAssembly with the whole file in tab memory.
Reference

Terms used on this page

Short, plain-language definitions for the formats and settings above.

Files & formatsMOVMOV is Apple’s QuickTime video container, the default format iPhones and Macs record in. Like MP4 it wraps video and audio streams rather than defining quality, and on Apple devices it typically holds HEVC or H.264 video.iOSmacOSGeneralFiles & formatsCodecA codec is the method used to compress and decompress video or audio — it decides how much detail is kept and how small the file becomes. Common video codecs are H.264 and HEVC (H.265); common audio codecs are AAC and MP3. The codec, not the file extension, controls quality and size.GeneralPhotos & videoScreenshotA screenshot is an image captured of whatever is on your screen, saved into your photo library like a regular picture. Individually small, screenshots accumulate fast and clutter the camera roll because most are saved once and never needed again.iOSAndroidGeneralStorage conceptsVideo codec (H.264 vs H.265/HEVC)A video codec is the method used to compress and decompress video. H.265 (HEVC) is the newer successor to H.264 (AVC) and encodes the same quality in noticeably less space, which is why modern phones record in HEVC to keep video files smaller.General
At a glance

Who MOV to MP4 is for

A quick way to understand who this helps, what it solves, and where it connects next.

Best fit

People with an iPhone or QuickTime MOV that will not play or upload cleanly elsewhere

Ideal for

Turning an Apple MOV clip into a cross-platform MP4

FAQ

Common questions

Short answers for the questions people usually have before trying a utility like this.

Is this tied to one store?

No. This page is intentionally generic and is meant for alternative Android stores or third-party app marketplaces that do not fit a more specific store flow.

Can I still switch the canvas and pacing?

Yes. The page opens with a generic app launch setup, but the same arrange, canvas, pacing, and export controls remain available.

Does export remain local-only?

Yes. Preview and export stay on the device in the browser, without server-side video rendering.

Why re-encode when MOV and MP4 are nearly the same format?

Because a lossless remux requires the source codec to already be MP4-legal, and a browser tool cannot count on that. Re-encoding to H.264 always works, whether the MOV holds H.264, HEVC, ProRes, or MJPEG. The cost is one generation of quality.

Will this fix an iPhone video that Windows or a web uploader refuses?

Usually yes. That failure is almost always HEVC, and the output here is H.264 in an MP4 with the faststart flag, which is the most widely accepted combination there is.

Does the HDR look wrong afterwards?

It can. The export forces yuv420p 8-bit, so a 10-bit HDR recording is converted to SDR. Colours can look washed out or dull compared with the original on an HDR screen. There is no HDR-preserving option here.

Is the file uploaded anywhere while it converts?

No. The MOV is read into the tab and processed there. The only thing downloaded is the encoder itself, a WebAssembly build fetched from a public CDN on first use.

What preset should I pick for a clip I will post to social?

Balanced, which is CRF 27. Social platforms re-encode whatever you send them, so shipping an already over-compressed CRF 35 file stacks two lossy passes and produces visible blocking.

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