Is this really ffmpeg?

Yes — it is the official ffmpeg build compiled to WebAssembly, running inside your browser tab.

Are my files uploaded?

No. The file is read into browser memory, processed locally and the result is handed back to you as a download.

Why is the first run slow?

The browser downloads the ffmpeg core (~32 MB) once and caches it. Later runs start immediately.

What file size can I use?

Up to about 512 MB, though browser memory limits mean short clips re-encode far faster. Use -c copy where possible.

Which commands are supported?

Most ffmpeg filters, codecs and containers. ffprobe is not included, but `ffmpeg -i file` prints the same stream information.

FFmpeg Online — Run Commands in Your Browser

Run real ffmpeg commands on your video, audio or image — no install.

Works Offline

Privacy First

No Login

No API

Pick a command

Start from a preset, then edit it however you like

Current command

ffmpeg -y -i input.mp4 -c:v libx264 -crf 28 -preset veryfast -c:a aac -b:a 128k output.mp4

Filenames like input.mp4 are matched to the files you add — you do not have to rename anything. Everything runs inside this tab; no file is uploaded.

Run it here

Add your file and run the command in your browser — nothing is uploaded

Drop a file here

Video, audio or image — up to 512 MB, processed locally with ffmpeg.wasm

Input files this command needs

input.mp4→ add a file above

Command (one per line)

The first run downloads the ffmpeg WebAssembly core (~32 MB) and then caches it. Encoding in the browser is slower than a native install, so keep clips short for heavy re-encodes.

About the FFmpeg Online — Run Commands in Your Browser

A working ffmpeg command line in the browser. Drop in a video, audio file or image, type or pick a command, press Run and download the output. Powered by ffmpeg.wasm, so your files never leave your device.

Examples

Compress a clip

clip.mp4 + compress preset

Output

output.mp4, smaller file, downloadable

Extract audio

clip.mp4 + extract audio preset

Output

output.mp3

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-14 · Runs entirely in your browser