Compress MP4 free — no upload
Shrink MP4 videos right in your browser and keep them as MP4, the format every phone, computer and app plays. Your video never leaves your device.
This browser can't compress video. Use a recent version of Chrome, Edge, Safari or Firefox on a computer — the video is still processed on your device and never uploaded.
How to compress an MP4
- Drop an MP4, MOV or WebM video into the box above.
- Choose the resolution (720p is plenty for most sharing) and a quality, or a size target such as under 10 MB.
- Optionally trim it or remove the audio.
- Click Compress video, compare the result with the original and download it.
How video compression works in MiniFiles
- Processed on your device. The video is decoded and re-encoded by your browser's own video encoder (WebCodecs, usually hardware-accelerated) with the Mediabunny library. Nothing is uploaded.
- Size or quality. Pick High, Balanced or Small quality, or a size target such as under 10 MB for Discord or 25 MB for email; the bitrate is worked out from the video's length.
- Smaller frame, smaller file. Scaling a 4K or 1080p phone video down to 720p is usually the biggest saving. Videos are never upscaled, and vertical videos stay vertical.
- Trim and mute. Keep only part of the video, or remove the audio track, before compressing — both make the file smaller still.
- Plans. Free: MP4 output at 720p or 480p for videos up to 200 MB, compressed to any size you choose. Pro adds the original resolution and 1080p, no file size limit and WebM. Without an account you get 10 uses a day across all tools.
Step-by-step guide: how to compress files for Discord.
Frequently asked questions
How much smaller will my video get?
Phone videos at 1080p or 4K often shrink by 70–90% at 720p with Balanced quality. Videos that are already heavily compressed shrink less; the new size is shown before you download.
Can I compress a video to a specific size?
Yes. Choose Custom size and enter the size in MB — 8, 20, 50 or anything else. MiniFiles works out the bitrate from the video's length to stay under it. If the size is too small for the length, it tells you the minimum.
What does compressing a video mean?
Re-encoding it with a lower bitrate and, usually, a smaller frame size so it takes fewer megabytes. Some detail is discarded, but at sensible settings the difference is hard to see on a phone or laptop screen.
Is my video uploaded to a server?
No. MiniFiles compresses videos in your browser with the browser's own video encoder, so the file never leaves your device.
Which browsers work?
Recent versions of Chrome, Edge, Safari and Firefox on a computer. Phones work for short videos, but long videos can run out of memory.
Why won't my iPhone video open on Windows?
iPhones record in HEVC (H.265), which Chrome on Windows can only decode with Microsoft's HEVC extension installed. Use Safari or Edge, or install the extension.
Is it free?
Free: MP4 output at 720p or 480p for videos up to 200 MB, compressed to any size you choose. Pro adds the original resolution and 1080p, no file size limit and WebM. Without an account you get 10 uses a day across all tools.
More private file tools
Every MiniFiles tool runs in your browser — your files are never uploaded.