Compress MP4
Free, no watermark, no signup, and your file never leaves your device.
About 40% smaller, quality kept, never larger than the original
MP4 files are big mostly because cameras encode generously: phones record at bitrates chosen for editing headroom, not for sharing. Re-encoding the same footage at a delivery bitrate typically halves the size with little visible change.
Compression happens right on your own device, which makes it fast, easy on your battery, and completely private: the file never leaves your machine and is never uploaded.
Pick "Just smaller" for a balanced re-encode, or choose a hard size target if you're up against a specific limit.
Questions people ask
- How much smaller will my MP4 get?
- Phone and screen recordings typically shrink 40-70% with no obvious quality loss. Files already compressed for delivery (downloaded videos) shrink less, there's less waste to remove. Either way the tool won't hand back a file larger than your original; if it can't beat the source, it returns the source untouched.
- Does compressing again and again ruin quality?
- Each re-encode loses a little detail (generation loss). One compression pass is fine; five stacked passes will look soft. Keep your original and compress from it each time.
- Is there a file size or length limit?
- No artificial ones. Practical limits come from your device's memory and patience, hour-long 4K files work but take a while. The hardware path streams the file rather than loading it all at once.