TIER 1 · AUDIO
MP4 to MP3 Converter
Extract MP3 audio from MP4 video locally using FFmpeg.wasm. No server upload.
LOCAL PROCESSING PANEL
MP4 → MP3
ACCEPT: mp4 / mov / m4v / webm
IDLE · waiting for input
Why this tool works this way
Load the FFmpeg core on demand, demux an MP4 file in browser memory, encode an MP3 track and download the audio. The WASM core is cached from a CDN and only loaded when you start processing.
How it works
- 01
Select a supported file or, for voiceover, paste a script that you have rights to use.
- 02
Choose the output format and adjust quality, width or language according to the destination.
- 03
Start the local job and allow the browser to load the required encoder only once.
- 04
Inspect progress and logs, then download the result and keep the original until verification is complete.
Frequently asked questions
Is MP4 → MP3 free to use?
Basic browser-local processing is free. Batch and larger workflows may carry Pro limits.
Where does my file go?
The selected file is processed in this browser tab and is not uploaded for the conversion itself. Only the web app and lazy WASM assets are downloaded.
Which output should I choose?
Accepted outputs include MP3. Choose MP3 for broad audio compatibility, WebP/JPEG for images, SRT/VTT for subtitles, or the format requested by your publishing destination.