FFmpeg.wasm · Video compression

Free Online Video Compressor

Browser-based video compressor that converts your video to MP4 (H.264) locally with optional 720p/1080p scaling, CRF quality control and audio bitrate settings. No uploads or tracking.

Select video file

Select a video file, load ffmpeg.wasm, then compress it to MP4 (H.264) entirely in your browser. Adjust resolution, CRF quality and audio bitrate to balance size and visual quality.

Idle

Tip: Lower CRF values produce higher quality and larger files; around 23 is a good balance for many videos. 720p/1080p scaling limits height while preserving aspect ratio. All processing runs locally in your browser with no video uploads.

File & Resolution

Resolution Quality (CRF) Preset Audio bitrate (kbps)

FFmpeg logs

Choose a video file, adjust compression parameters, then click “Compress”. A medium CRF with 720p scaling is often a good starting point.

Subtitle Tools

Convert subtitle formats and fix timelines entirely in your browser, with UTF-8/GBK encoding support and no file uploads.

Video Format Converter

Convert local videos between MP4/WebM/MKV/MOV/AVI with configurable scaling, FPS, CRF and audio bitrate, all processed locally in your browser.

Video Player

Play local video files in your browser with speed, volume, loop and picture-in-picture controls, all processed locally with no uploads.

Video to GIF Converter

Convert local video segments to GIF with adjustable FPS and width, processed fully in the browser with no uploads.

Video Trimmer

Trim local videos by start and end time and export the selected part as a WebM clip, processed fully in the browser.

Scientific Calculator

Perform everyday calculations and basic scientific functions directly in your browser with keyboard support and no data uploads.