Convert MP4 to MP3 — Free Online Audio Extractor

Extract audio from video files and convert to MP3 format. 100% browser-based, no upload, no sign-up. Adjustable bitrate up to 320 kbps.

100% Free No Upload Privacy First

Drop your video file here

or click to browse • MP4, WebM, MOV, AVI • Max 200 MB

Higher = better quality, larger file
Loading FFmpeg WASM (~30 MB)...
Converted Audio
How It Works

Extract MP3 Audio in 3 Steps

1

Upload Video

Drag and drop your MP4, WebM, MOV, or AVI file. All processing stays in your browser.

2

Choose Bitrate

Select your preferred audio quality from 128 kbps to 320 kbps. Higher bitrate means better fidelity.

3

Download MP3

Extract and download your MP3 audio file instantly. Your files never leave your device.

FAQ

Frequently Asked Questions

Is this MP4 to MP3 converter really free?
Yes. FormatSpot's MP4 to MP3 converter is 100% free with no sign up, no watermarks, and no limits on how many files you convert.
Are my videos uploaded to a server?
No. All conversion happens locally in your browser using FFmpeg WASM. Your files never leave your device, so your privacy is fully protected.
What is the maximum file size?
We recommend keeping videos under 200 MB. Larger files may cause the browser to run out of memory since everything is processed locally.
What video formats are supported?
You can upload MP4, WebM, MOV, and AVI files. The tool extracts the audio track and converts it to MP3 format.
What bitrate should I choose?
128 kbps is good for general listening. 192 kbps balances quality and size. 256 kbps and 320 kbps are for high-fidelity audio. Higher bitrate means larger file size.

Complete Your Media Workflow

Use FormatSpot alongside Picslimly and HueGrad for the best results.

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