ffmpeg webCLI

tejaswigowda.com/ffmpeg-webCLI Video Editing & Animation Online tool

Edit video in a browser with ffmpeg webCLI, a progressive web app that loads FFmpeg on demand.

About ffmpeg webCLI

ffmpeg webCLI is a progressive web app that runs FFmpeg in the browser via ffmpeg.wasm. Users load FFmpeg (~31 MB), then add local files such as MP4, WebM, MOV, AVI, MKV and GIF for trimming and operations including conversion, resizing, audio extraction and subtitle embedding.

The site describes processing as 100% local with no data leaving the browser. FFmpeg must be loaded before use, and reverse buffers the whole clip in memory, with guidance to keep clips under about 2 minutes.

Key features

Trim clips by setting start and end times
Convert video format using output format selector
Resize and compress with width, CRF and preset controls
Extract audio to MP3, AAC, WAV, OGG or FLAC
Generate auto-captions on-device with Whisper models
Embed SRT, VTT or ASS as soft subtitles or hard-burn

Best for: People who want to make common video edits in a browser while keeping files local.

Good for

Processing is described as 100% local with no data leaving the browser
Accepts local MP4, WebM, MOV, AVI, MKV and GIF inputs
Includes options for conversion, resizing, audio handling and subtitle embedding

Watch out for

Requires loading FFmpeg (~31 MB) before editing can begin
Reverse buffers the whole clip in memory; guidance is to keep clips under ~2 minutes
Trim is ignored for Loop and Side by Side, and applies only to first clip in Concatenate