Turn a QuickTime MOV (from your iPhone or Mac) into an MP4 that plays everywhere - in seconds, in your browser.
Drop one or many - all convert to MP4. Per-row progress, batch convert, ZIP download.
MOV is what your iPhone, iPad, or QuickTime Pro records by default. It plays perfectly on Apple devices but is awkward everywhere else: Windows Media Player often refuses it, Discord and older editing tools trip over its structure, and upload-to-web flows frequently ask for MP4 instead. Converting to MP4 fixes all of that in one go.
The good news: MOV and MP4 share the exact same underlying container (ISO-BMFF), so most of the time this is a pure remux - we re-wrap the video and audio tracks into an MP4 shell without re-encoding them. That means zero quality loss and conversions measured in seconds rather than minutes, even for hour-long clips. Everything runs locally in your browser.
The remux operation is worth understanding because it explains why this specific conversion is so fast. A video file is a container (the outer wrapper, like MOV or MP4) plus inside it one or more tracks (the actual encoded video and audio bytes). Going from MOV to MP4 changes only the wrapper, not the tracks. The decoded picture and sound are byte-for-byte identical to the source. Most other conversions (WebM to MP4, AVI to MP4) require fully decoding and re-encoding the tracks because the containers expect different codecs; MOV to MP4 escapes that cost.
The most common motivation: someone records on an iPhone (so the file is .mov with H.264 or HEVC), then tries to share with someone on Windows or upload to a service that lists "MP4 only" in its accepted-formats list. Even though the iPhone could technically be configured to save MP4 directly (it can't, actually - iOS always saves MOV), most users discover this only when their upload bounces. Converting first is faster than fighting with the service.
Performance footnote: a 1-hour 4K MOV typically remuxes to MP4 in under 5 seconds on a modern laptop. That's because the work is "read header, write a new header pointing at the same byte ranges, copy". No video decoding happens. Compare that to a re-encode, which would saturate your GPU for 5-15 minutes for the same clip. If the conversion ever feels slow, it usually means a codec mismatch is forcing a re-encode - in which case Subformer falls back to the FFmpeg engine and a more conservative path.
Windows Media Player refuses many MOVs out of the box. Converting to MP4 lets recipients play the clip without installing extra codecs.
YouTube, Vimeo, TikTok, Twitter, and Instagram all accept MP4 first-class. MOV often works but sometimes triggers re-processing that softens the image.
The HTML5 video element wants MP4 with fast-start. Converting MOV produces a server-ready file you can host without further processing.
Premiere on Windows, DaVinci Resolve, and older Vegas builds prefer MP4. MOV with proprietary codecs (ProRes) needs converting first.
Some MOVs trigger "unsupported format" on chat platforms even though both sites technically accept them. MP4 always works.
MP4 has marginally better long-term tool support than MOV. Converting once at archive time avoids needing to reconvert later when sharing.
MOV is Apple's QuickTime container and shares the same ISO-BMFF structure as MP4 - which is why converting between them is usually a fast remux rather than a re-encode.
MP4 is the most widely supported video container, based on the ISO Base Media File Format. It can carry H.264, H.265 and AV1 video with AAC, MP3, or Opus audio.
Drag a MOV onto the converter above, or click the box to pick one from your device.
We've preselected MP4 as the output format. Change it from the dropdown if you want a different target.
Click Convert and wait for the progress bar to finish. Download the MP4 when it's ready.
Extract the audio from a QuickTime MOV and save it as an MP3 - in your browser, no upload needed.
Convert an MKV (Matroska) video to MP4 so it plays on phones, TVs, and every video editor - free, in your browser.
Convert a WebM video (downloaded from YouTube, Twitter, or a web recorder) to MP4 - fast, in your browser, no upload.