How to use Video to MP3 Converter
The Video to MP3 converter extracts the audio track from MP4, MKV, AVI, MOV and WebM video files and saves it as a high-quality MP3 file — all processed locally in your browser with no file uploads. Use it to rip the audio from a recorded lecture, a music video or a conference talk for offline listening.
- Click "Select Video" and choose your video file (MP4, MKV, AVI, MOV or WebM).
- Set the desired MP3 bit rate (128 kbps for voice, 320 kbps for music).
- Optionally trim start and end times to extract only a specific segment.
- Click Convert and wait for the browser to process the audio extraction.
- Download the resulting MP3 file to your device.
Your data never leaves your device — 100% private processing.
Choosing the right MP3 bit rate
MP3 bit rate controls quality and file size. 128 kbps is acceptable for speech and podcasts. 192 kbps is a good all-purpose choice. 320 kbps is the maximum MP3 bit rate and is indistinguishable from the source for most listeners. Extracting audio from a compressed video cannot recover quality lost during the original video encoding, so there is no benefit to choosing a bit rate higher than the source audio quality.
| Bit rate | Quality | Use case |
|---|---|---|
| 64 kbps | Low | Voice memos, audiobooks |
| 128 kbps | Good | Podcasts, speech |
| 192 kbps | Very good | General music |
| 320 kbps | Excellent | High-fidelity music |
How in-browser audio extraction works
This tool uses FFmpeg compiled to WebAssembly (WASM) to demux the video container and decode the audio stream directly in your browser. The video file never leaves your device — no upload is needed and your content stays private. The WASM binary is loaded once and cached so subsequent conversions are faster. Processing speed depends on your CPU and the video file size.
Worked examples
4-minute song at 192 kbps
Inputs: 240 s audio, 192 kbps MP3
Result: ~5.8 MB MP3
1-hour podcast at 128 kbps
Inputs: 3,600 s audio, 128 kbps MP3
Result: ~58 MB MP3
Glossary
- Bit rate
- The number of bits processed per second in an audio file; higher values mean better quality and larger file size.
- Demuxing
- Separating the audio and video streams from a container format such as MP4 or MKV.
- Codec
- Software that encodes or decodes a media stream — e.g. H.264 for video, AAC for audio.
- Container
- A file format (MP4, MKV, AVI) that wraps audio, video and metadata streams into a single file.
- WebAssembly
- A binary instruction format that enables near-native-speed code execution inside the browser sandbox.
Related reading
Frequently Asked Questions
Why use Video to MP3 Converter?
- Extract an MP3 audio track from any video file without desktop software
- Choose bit rate from 64 kbps to 320 kbps to balance quality against file size
- Trim start and end timestamps to extract only the segment you need
- Supports MP4, MKV, AVI, MOV and WebM — the five most common video containers
Common use cases
- Rip the audio from a lecture recording to listen offline during a commute
- Extract the soundtrack from a downloaded concert video to add to a music playlist
- Pull audio commentary from a gameplay video to create a standalone podcast episode
- Convert a language-lesson MP4 into an MP3 to load onto a basic media player
- Save the audio from a conference keynote video for later transcription
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