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MOV to MP4 converter

Drop a .mov file, press Convert to MP4, and download an MP4. FFmpeg remuxes H.264/AAC when the streams already fit, or re-encodes otherwise. The free size bar is 1024 MB. Nothing is uploaded.

  1. Choose file
  2. Set options
  3. Get result

Limits in your browser: 1024 MB.

Your file never leaves your device. Processed locally in your browser. Nothing is uploaded.

The download is always an MP4 (H.264 and AAC, or a fast remux when the streams already fit). The MOV is not uploaded.

Drop an iPhone or camera MOV and download an MP4. This page accepts QuickTime .mov only. The output is always MP4.

How to convert MOV to MP4

  1. Drop one .mov file. MP4, MKV, WebM and photos are refused here.
  2. Press “Convert to MP4”.
  3. Download the MP4 and play it once before you delete the original.

The first visit also loads FFmpeg into this tab. Later visits reuse the browser cache. iPhone clips shot in Most Compatible often finish in seconds because FFmpeg can remux H.264 and AAC into an MP4 container.

Remux first, encode when the codec does not fit

When the video is already H.264 and the audio is AAC, GustKit copies the streams into a new MP4 with faststart. High Efficiency HEVC, ProRes, or odd audio codecs trigger a fallback encode to H.264, yuv420p and AAC at 128 kbps so players stay happy.

Compress video shrinks an MP4 you already have. Trim video cuts before you convert. GIF to MP4 and MP4 to GIF sit on the wider Video & audio tools hub.

The MOV stays in this tab

GustKit does not fetch a file from a link. Close the tab and the clip is gone from memory. The free size bar shows 1024 MB for this tool.

How to check the MP4 before you share it

  1. Play the download from the start and scrub near the end.
  2. Listen once if the MOV had sound.
  3. Keep the original until picture and audio both look right.

iPhone clips in Most Compatible often remux in seconds. A High Efficiency or ProRes MOV takes longer because FFmpeg must re-encode. Nothing is uploaded.

Remux or re-encode

PathWhat the clip usually needs
RemuxMost Compatible (H.264): FFmpeg copies H.264 and AAC into MP4. The download stays close to the MOV size.
Re-encodeHigh Efficiency (HEVC): the MP4 can grow. HDR 10-bit becomes yuv420p with AAC at 128 kbps.

Frequently asked questions

Windows Media Player will not open my MP4 after a HEVC MOV. Why?

Older Windows players expect H.264 inside MP4. A High Efficiency iPhone MOV may need the re-encode path so the download is H.264 and AAC.

Does remux change the file size?

Remux copies the streams into a new MP4 with faststart. The download is usually almost the same size as the MOV, not a big shrink.

Why is the MP4 bigger after re-encode?

Re-encode writes a new H.264 track at high quality. A short clip can land a bit larger than a tight phone original. Compress video is the page to shrink it.

What if my MOV is too large for this tab?

The free size bar has a fixed cap. Open Trim video on the MOV first, then convert the shorter file here.

What happens to HDR and the soundtrack?

HDR 10-bit video becomes yuv420p SDR on re-encode. Audio maps to AAC at 128 kbps on that path. Remux keeps the original tracks when copy works.

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