Compress MP4 to MP3
Need smaller audio files? Converting MP4 to MP3 dramatically reduces file size. A 50MB file becomes 5MB. Perfect for email, sharing, and storage.
Drop your MP4 file here or click to browse
MP4 (.mp4) · Max 20 MB
MP4 files are already compressed, but MP3 can compress further at a different bitrate. The size reduction is significant for sharing, uploading, and storage.
For email attachments, 128-192kbps works well. For music sharing, use 256-320kbps. AudioUtils lets you drop your file and convert instantly. No upload to a server, no waiting.
Both MP4 and MP3 are lossy formats. Each re-encode can degrade quality slightly. Convert once and keep the result. Choose the right bitrate for your use case. Higher bitrate means better quality but larger files.
Frequently Asked Questions
Will I lose audio quality converting MP4 to MP3?
Most MP4 files already use AAC audio compression. Converting to MP3 involves re-encoding, which can introduce minimal quality loss. At 320kbps, the difference is negligible for most listeners.
Can I extract audio from YouTube downloads?
If you have a locally saved MP4 file, yes. This tool processes files on your device — it doesn't download from URLs.
What happens to the video data?
The video track is discarded entirely. Only the audio is extracted and converted to MP3. Your file size drops dramatically.
About MP4
The most common video container format. Used by YouTube, smartphones, and cameras. Extract audio from any MP4 file instantly.
About MP3
The most widely used audio format. Great compatibility, small file size. Ideal for music, podcasts, and general use.