MOV Compressor

QuickTime MOV files can be large because they may carry high-bitrate camera footage or edit-friendly codecs, so this compressor focuses on predictable size reduction. Step one validates the uploaded .mov file and prepares it for browser-side processing. Step two applies your chosen quality preset, which maps to different CRF values and audio bitrates. Step three runs FFmpeg WebAssembly to re-encode video with H.264 while keeping the output in a MOV container for workflow compatibility. Step four returns a downloadable file with before-and-after size metrics and percentage saved.

Compression behavior is controlled by CRF: lower values keep more detail, higher values reduce size more aggressively. Balanced preset is usually the safest starting point because it avoids extreme quality loss while still cutting storage and transfer overhead. The generated file also uses fast-start metadata placement so playback can begin sooner in many players.

Practical tip: trim unnecessary heads and tails before compression. Removing unused seconds often saves more space than pushing quality too low, and it protects visual quality where it matters. If a file fails, try a shorter clip or a different preset. All processing happens locally in your browser. Files are never uploaded to our servers.