Free Online Video Compressor - ATools

Free online video compressor to MP4 (H.264) with scaling and CRF quality control. Runs locally.

Video compressor to MP4 (H.264) with CRF quality control and optional scaling. Loads ffmpeg.wasm locally (no uploads).

支持拖拽新视频到此区域直接替换。

File

ResolutionQuality (CRF) (18-35)PresetAudio bitrate (kbps)

Note: higher CRF means smaller size and lower quality (common range: 20–28).

FFmpeg logs