Compress MP4
Free, no watermark, no signup, and your file never leaves your device.
Reduces the file size while keeping good quality.
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, since 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.