You downloaded a 2-hour video podcast, a university lecture, or a music video, but you only want to listen to it while you commute or work out. Video files are massive and drain your phone's battery when the screen is on.
The solution is simple: Extract the audio track.
Our Video to Audio Tool allows you to strip the sound from any video file (MP4, MOV, WebM, MKV) and save it as a lightweight MP3 file — directly in your browser.
3 Reasons to Extract Audio
1. Save Massive Amounts of Space
An hour-long 1080p video file can easily take up 1,500 MB (1.5 GB) of storage. The extracted MP3 audio for that exact same hour takes up just 60 MB. That is a 96% reduction in file size, saving your phone's storage.
2. Battery Life
Playing video forces your phone to keep the screen on and the GPU running. Playing an MP3 allows you to lock your screen, slip the phone in your pocket, and use a fraction of the battery.
3. Repurposing Content for Creators
If you record video podcasts or YouTube videos, you can extract the audio track to upload directly to Spotify, Apple Podcasts, or use it as background music for a different video.
How to Convert MP4 to MP3 Online
Most desktop software is bloated, and most online tools require you to upload huge files to shady servers. We solved this using browser-based WebAssembly.
- Open the Video to Audio Tool.
- Upload your video file. (Because it runs locally, the "upload" is instantaneous, even for a 3GB file).
- Choose your Audio Quality (Bitrate):
- 128 kbps: Good for lectures, talking-head podcasts, and voice memos. Creates the smallest files.
- 192 kbps: The standard. Good balance for music and voice.
- 256 kbps: High quality. Recommended if the video contains high-fidelity music or sound design.
- 320 kbps: Maximum MP3 quality. Use this if you plan to edit the audio further.
- Click "Extract Audio".
- Wait a few moments while your CPU processes the file, then click Download MP3.
Understanding Audio Quality (Bitrate)
When extracting audio, you will see a setting measured in "kbps" (kilobits per second). This is the bitrate. It dictates how much data is used to represent one second of audio.
Higher bitrate = better sound quality, but larger file size.
The Golden Rule: You cannot improve audio quality by choosing a higher bitrate than the original video had. If the original video was recorded with a cheap microphone at 128 kbps, extracting it at 320 kbps will not make it sound better — it will just waste disk space. When in doubt, 192 kbps is the safest, most universal setting.
Supported Formats
Our tool can extract audio from almost any modern video container:
- MP4 (Standard web & phone video)
- MOV (Apple / iPhone video)
- WEBM (Modern web video)
- MKV (High-quality rips)
- AVI (Older PC video format)
It outputs an MP3 file, which is the most universally compatible audio format in the world. It will play on any phone, computer, car stereo, or smart speaker made in the last 20 years.
Security: Why "Local" is Better
If you are extracting audio from a proprietary company meeting, a private Zoom lecture, or family home videos, you should never use a cloud-based converter. Cloud sites force you to upload your sensitive video to their servers, where it could be logged or hacked.
Our Video to Audio Tool runs entirely on your local machine. The conversion happens inside your web browser. No data is ever sent over the internet, guaranteeing total privacy and much faster conversion speeds.