SquishClipMp4 vs mov which is smaller
MP4 and MOV: What These Formats Actually Are
MP4 and MOV are container formats, meaning they wrap compressed video and audio data rather than defining the compression themselves. The codec used inside the container — such as H.264 or H.265 — is the primary driver of how large or small the resulting file will be.
Because both formats can hold the same codecs, two files using identical compression settings can produce nearly identical file sizes regardless of whether the wrapper is .mp4 or .mov.
Which Format Is Generally Smaller?
In practice, MP4 files tend to be smaller than MOV files when both are exported from common editing tools. This is largely because MOV files are often exported with higher default quality settings or less aggressive compression, not because the container itself adds bulk.
MOV files originating from Apple devices and professional editing software frequently use high-bitrate or lossless-adjacent settings by default, which produces noticeably larger files compared to a web-optimized MP4 at equivalent visual quality.
The Role of Codecs and Encoding
Modern browsers and devices can encode and decode video using hardware acceleration, allowing the same underlying codec to be wrapped in either an MP4 or MOV container with equivalent efficiency. The WebCodecs API, for example, enables low-level, hardware-accelerated video encoding and decoding in the browser on a per-frame basis.
This means that if you export an H.264 video as both an MP4 and a MOV at the same bitrate and resolution, the file sizes will be nearly identical — the container adds only minimal overhead.
Reducing File Size Regardless of Format
Whether you are working with MP4 or MOV, the most effective way to reduce file size is to lower the bitrate, reduce the resolution, or switch to a more efficient codec such as H.265. You can use a tool like the SquishClip video compressor at / to compress MP4 and MOV files quickly without re-wrapping them manually.
If compatibility is your primary concern — for web use or sharing across platforms — MP4 with H.264 encoding remains the most universally supported and typically delivers smaller files out of the box compared to MOV files exported with default Apple or professional software settings.
Try the free video compressor on SquishClip.