Upload your .mp4 file and get a smaller, optimized MP4. Works with MP4 files from any source. Free, no account required.
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Drag & drop your .mp4 video file. We support files up to 500MB. No account needed.
SquishVideo converts and compresses your MP4 to optimized MP4 H.264, reducing file size while preserving quality.
Get your compressed MP4 instantly. It's compatible with every platform, device, and browser.
MP4 (MPEG-4 Part 14) is the most widely used video format in the world. Developed by the ISO/IEC Moving Picture Experts Group, it became the de facto standard for video distribution online, on mobile devices, and in streaming. Most videos you encounter — from YouTube to TikTok to your phone's camera — are already in MP4 format.
Even though MP4 is already an efficient format, many MP4 files are larger than they need to be. Camera recordings, screen captures, and exported videos often use higher bitrates than necessary for their intended purpose. Re-encoding an MP4 with optimized H.264 settings can reduce file size by 50-80% with minimal visible quality loss.
MP4 was developed by ISO/MPEG in 2001. It uses the MPEG-4 Part 14 container and typically contains H.264/H.265 encoded video. Browser support is universal, and mobile support is universal. For streaming, MP4 offers yes, natively capabilities.
If your MP4 is already well-compressed and at a reasonable file size, there's no need to re-encode it. But if it came from a camera (high bitrate), screen recorder (variable settings), or video editor (export settings), our optimizer can significantly reduce its size. We also handle MP4 files with unusual codecs (MPEG-4 ASP, H.265) by converting them to universally compatible H.264.
| Feature | MP4 | MP4 (H.264) |
|---|---|---|
| Container | MPEG-4 Part 14 | MPEG-4 Part 14 |
| Typical Codec | H.264/H.265 | H.264 / H.265 |
| File Size | Medium | Optimized (smallest) |
| Browser Support | Universal | Universal |
| Mobile Support | Universal | Universal |
| Streaming | Yes, natively | Yes, natively |
When you upload a MP4 file, SquishVideo first analyzes the video stream to understand its codec, resolution, framerate, and bitrate profile. We then transcode the video to H.264 MP4 using optimized encoding parameters. The entire process preserves audio quality (re-encoded to AAC) and maintains the original resolution unless a lower resolution would provide a better quality-to-size ratio.
MP4 files typically come from: phone cameras, action cameras (GoPro), screen recorders, social media downloads, and video editors.
SquishVideo supports 20+ video formats. Choose your input format:
Need your MP4 video to fit a file size limit? Pick a target: