Reduce video file size online without uploading to any server. Privacy-first compression powered by FFmpeg.wasm — runs entirely in your browser.
View All CompressorsCompress MP4 videos with H.264 encoding. Reduce file size 50–80% while preserving visual quality.
Compress MP4 →Compress WebM videos with VP9 codec. Excellent quality-to-size ratio for modern web browsers.
Compress WebM →Convert and compress iPhone MOV files to web-compatible MP4. Dramatically reduce file size.
Compress MOV →Max Compression
Video Formats
Privacy
Compression always involves some trade-off, but using the right settings you can reduce file size by 50–80% with minimal visible quality loss. Our 'High Quality' preset uses CRF 18 which is visually lossless for most content.
For 1080p video, 4–8 Mbps with H.264 is typical for streaming. For 720p, 2–4 Mbps is usually sufficient. Our 'Balanced' preset targets a good middle ground automatically.
It depends heavily on the source content. Screen recordings with static backgrounds can often be compressed 80–90%. High-motion footage like sports typically compresses 40–60%. Our Maximum Compression preset pushes the limit for smaller files.
H.265 (HEVC) achieves the same quality at roughly half the file size of H.264, but requires more processing power and has limited browser support. H.264 (MP4) remains the most compatible format for web and social media use.
MP4 with H.264 encoding is the gold standard for web compatibility. WebM with VP9 is a strong alternative for browsers that support it, offering similar compression efficiency to H.265.
Use a lower resolution (720p instead of 1080p), reduce frame rate to 24fps or 30fps, and choose our 'Maximum Compression' preset. Also consider removing audio if it's a background video.
No. All compression happens entirely in your browser using FFmpeg.wasm – a WebAssembly port of FFmpeg. Your video never leaves your device.
There is no hard file size limit — the tool processes files entirely in your browser using WebAssembly. Performance depends on your device's available RAM. Very large files (multi-GB) may take longer but will compress successfully on most modern devices.
Yes. Upload your MOV file and choose MP4 as output. The tool will re-encode it to H.264/MP4 which is widely compatible with all devices and platforms.
Audio typically accounts for 5–15% of total video file size. Removing it helps, but the biggest gains come from adjusting video bitrate and resolution.
CRF (Constant Rate Factor) controls quality vs. file size. Lower CRF = higher quality, larger file. Our 'High Quality' mode uses CRF 18 (near-lossless), 'Balanced' uses CRF 28, and 'Maximum Compression' uses CRF 38.
Yes. Page speed is a Google ranking factor. Embedding heavy videos slows down load times. Compressing video to under 5MB and using lazy loading significantly improves Core Web Vitals scores.