MOV to MP4 Converter โ€“ Stream Copy or H.264

Convert MOV to MP4 in your browser. Use stream copy for compatible codecs or re-encode to H.264 when playback compatibility matters.

Click for theater mode

Drop MOV files

Choose your MOV files. Conversion happens locally in your browser. No uploads.

Select MOV files to begin.

Selected MOV files are processed in your browser and are not uploaded by the converter.

Conversion Queue

0 files total

Your conversion tasks will appear here.

How to Use

  1. Drag and drop your .mov video files into the upload area or click "Select Files".
  2. Leave "Stream Copy" selected when the MOV already contains streams that MP4 accepts. Choose "Re-encode" for an H.264 fallback.
  3. Click "Convert to MP4". The browser loads FFmpeg on first use and then processes each queued file.
  4. Download the result and test it in the intended player. If a copied file fails, repeat with re-encode mode.

Core Features

  • MOV-Only Input: Add one or more MOV files and create MP4 outputs in a browser queue.
  • Stream Copy by Default: Compatible video and audio streams are moved into an MP4 container without re-encoding. This avoids a new encoding pass but does not change incompatible codecs.
  • H.264 Re-encode Fallback: Choose re-encode when stream copy fails or the copied MP4 does not play on the target device. This mode uses H.264 at CRF 28 and is lossy.
  • Browser Resource Boundary: The converter does not upload the selected MOV file, but it downloads FFmpeg when first needed. Large videos require substantial CPU time and RAM.

Need to convert MKV, AVI, WebM, or other video types? Use the general MP4 converter.

Need evidence before choosing a mode? Review the tested MOV to MP4 codec compatibility matrix with public samples, hashes, exact commands, and failed cases.

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Calculation Logic

FFmpeg WebAssembly runs in the browser. Stream copy uses the original media streams, adds MP4 fast-start metadata, and does not introduce a new encoding loss. It can only succeed when the source codecs and metadata fit the MP4 container.

Re-encode mode decodes the video and encodes H.264 with the ultrafast preset at CRF 28. That process is lossy and more CPU- and RAM-intensive, but it can replace an incompatible source video codec.

FAQ

Does stream copy change video quality?

It does not re-encode the video or audio streams, so it adds no new encoding loss. It also does not repair an unsupported codec; the copied MP4 still needs compatible source streams.

Why can a large MOV fail in the browser?

The input, FFmpeg engine, and output use device memory. Long or high-resolution videos can exceed available RAM or take substantial CPU time.

Why convert Apple's MOV to MP4?

MOV and MP4 are containers. Changing the container may help a workflow that expects MP4, but playback still depends on the video and audio codecs inside it.

What is the "Deep Re-encode" mode for?

Use it when stream copy fails or the resulting codec is not supported by the target player. It creates an H.264 video at CRF 28; conversion is lossy and final compatibility still depends on the player.