How to Convert MOV to MP4 (Free, Online, No Upload)

The fastest way to convert a MOV file is PixelTools' [MOV to MP4 tool](/convert-video/mov-to-mp4). Drop your `.mov` file onto the page, wait while it processes, and download the resulting `.mp4`. There's no account to create, no software to install, and the file never leaves your device — the conversion runs entirely in your browser using WebAssembly (ffmpeg.wasm). When the video's existing codecs are already compatible with MP4, the tool uses a fast stream-copy path instead of a full re-encode, so many conversions finish in seconds rather than minutes.

MOV is Apple's video container, and it's what the iPhone Camera app saves by default — often using HEVC encoding for the video track. That works fine on Apple devices, but plenty of destinations don't accept it. Corporate LMS platforms frequently reject MOV uploads outright. Ad platforms like YouTube Ads Manager and Meta Ads Manager expect MP4 with H.264 video for reliable processing. Older video editors and some Windows software either can't open MOV at all or choke on HEVC specifically. MP4 with H.264 is the closest thing to a universal standard for video, which is why converting is usually the quickest fix rather than troubleshooting compatibility on the receiving end.

This tool runs ffmpeg.wasm — a WebAssembly build of the ffmpeg engine — directly in your browser tab. It first checks whether your MOV file's codecs are already compatible with MP4's container requirements. If they are, it does a stream copy: repackaging the existing video and audio data into an MP4 container without touching the encoded frames. This is fast because there's no decoding or re-encoding work involved. If the codecs aren't compatible (or the destination specifically needs H.264), the tool falls back to a real re-encode, decoding the video and re-encoding it as H.264, which takes longer but guarantees broad compatibility with the output.

Because the conversion happens entirely client-side, nothing about the video — its content, length, or metadata — is sent to a server. That makes it a reasonable default for footage you'd rather not upload anywhere, including work recordings bound for an LMS or ad account. Processing speed depends on whether a stream copy or a full re-encode is used and on your device's CPU, since your machine is doing the work instead of a remote server. There's no account requirement and no watermark added to the output MP4 — the file you download is ready to upload wherever it's needed.

Converting MOV to MP4 changes the container and, when re-encoding is needed, the codec — but it doesn't necessarily shrink the file much on its own, especially with a stream copy that preserves the original bitrate. If your destination also has a file size limit (common with ad platforms and LMS upload forms), run the resulting MP4 through [PixelTools' video compressor](/compress-video) afterward to bring the size down further. It's a separate step, but it's the right tool for that specific job rather than something a format converter should try to also handle.

If you'd rather not use a browser tool, there are a few offline options:

ffmpeg (command line): `ffmpeg -i input.mov -c copy output.mp4` does a fast stream copy when codecs are already compatible; `ffmpeg -i input.mov output.mp4` re-encodes to H.264 when they're not.

QuickTime Player (Mac): File → Export As lets you save a copy in a different resolution, but doesn't always produce a strict H.264 MP4 depending on the source codec.

HandBrake: A free, open-source app built specifically for re-encoding video, with more control over quality and bitrate than most quick converters.

For a one-off conversion with no setup, an online tool is faster than installing and learning any of these.