Free Online Video Format Converter - ATools

Free online video format converter (MP4/WebM/MKV/MOV/AVI) with basic scaling/FPS/CRF settings. Runs locally.

Convert video formats (MP4/WebM/MKV/MOV/AVI) with basic options. Loads ffmpeg.wasm locally (no uploads).

File

Output formatResolutionFPSQuality (CRF) (16-35)PresetAudio bitrate (kbps)

Tip: codec support varies by browser/ffmpeg.wasm build. If it fails, try another format or lower settings.

FFmpeg logs