What This Tool Does
The MP4 to MP3 Converter pulls the audio track out of a video file and re-encodes it as a standalone MP3 - useful for saving a podcast, lecture, music video, or voice memo as audio you can play anywhere, without keeping the (much larger) video around.
How to Convert MP4 to MP3
- Upload: Drop one or more video files onto the drop zone, or click Browse Files.
- Choose a bitrate: Pick the MP3 quality that fits your needs - higher bitrates sound better but produce larger files.
- Convert: Click Convert - each file's audio is extracted and encoded in place.
- Download: Grab files individually or download them all at once as a ZIP.
Choosing an MP3 Bitrate
- 128 kbps - Good for spoken word (podcasts, lectures, voice memos) where file size matters most.
- 192 kbps - A solid, widely-used balance of quality and size for general use.
- 256 kbps - Noticeably better for music with more detail and dynamic range.
- 320 kbps - The highest standard MP3 bitrate, closest to the original audio quality.
Supported Input Formats
This tool extracts audio from any video container your browser's FFmpeg build can read, including:
- MP4 - the most common video format, used by phones, cameras, and most platforms.
- MOV - Apple's QuickTime format, common from iPhones and Macs.
- MKV - a flexible container often used for downloaded or ripped video.
- AVI - an older but still common Windows video format.
- WebM - a web-native video format.
Privacy & Security
Your video never leaves your device. The extraction and encoding happen entirely inside your browser using a local WebAssembly build of FFmpeg - no files are uploaded to any server, no account is needed, and there are no usage limits.
Frequently Asked Questions
Will this work with a video that has no audio track?
No - if the source file has no audio stream, there is nothing to extract. The conversion will fail for that file.
Can I convert multiple videos at once?
Yes. Drop as many files as you like - each appears as its own row with its own download button once converted.
Does this reduce audio quality?
MP3 is a lossy format, so there is some quality loss versus the original audio - choosing a higher bitrate (256 or 320 kbps) minimizes this.