Kasidit Yusuf

Kasidit Yusuf

Software engineer and clean energy enthusiast

How to extract audio from video (MP4 to MP3) and convert recordings in your browser - no upload

2 minute read

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Audio extractor and converter online screenshot

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Need a free online audio converter - extract the audio from a video (MP4 to MP3), or convert between MP3, WAV, FLAC, OGG, Opus and M4A? Personal recordings - voice memos, lectures, interviews, home videos - are exactly the files you don’t want uploaded to a random converter site. This tool is ffmpeg compiled to WebAssembly: conversion happens 100% inside your browser and your files never leave your machine.

Steps

  1. Open https://www.clearevo.com/audio/ (first use downloads the ~10 MB engine, cached after).
  2. Choose a file - any audio or video: MP4, MOV, MKV, M4A, WAV, voice-memo formats…
  3. Pick the output: MP3, WAV, FLAC, OGG (Vorbis), Opus, or M4A (AAC). Picking MP3 for a video extracts its audio track.
  4. Convert & download. The ffmpeg log streams below, with a progress bar, and the result downloads when done.

Honest limits, stated up front: in-browser ffmpeg is roughly 10-20x slower than the desktop version and input is capped at 500 MB - great for audio and short clips, the wrong tool for converting movies. Files over the cap are refused up front with a clear message instead of crashing the tab.

Everything is client-side (Google Analytics for visit stats only - verify).

This tool is free software and open source: ykasidit/clearevo_online_tools - issues and pull requests welcome.

Full disclosure: this post - and any code or tool it describes - was co-authored with Claude (Anthropic’s AI, via Claude Code). I directed, guided and reviewed. I don’t want to pretend otherwise.

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