Batch MP4 to MP3 Converter
Convert MP4 to MP3 online for free. 100% secure, fast, and private local file conversion directly in your browser. No software installation required.
Why convert MP4 to MP3?
MP4 is everywhere, but sometimes you only want the sound: a podcast you recorded as video, a lecture capture, a music video you want as a ringtone, or phone footage where the audio track is the actual deliverable. Converting MP4 to MP3 strips the video and hands you a small, universal audio file that plays anywhere and edits quickly. It is the standard move for podcast producers, students, and anyone harvesting audio from video they already own.
WasmConvert extracts the audio track from your MP4 and encodes it to MP3 entirely in the browser: the video file never leaves your device, so nobody sees or stores your footage. Pick the MP3 bitrate, 320 kbps for music you will keep or 128 kbps for lectures and speech, and convert multiple videos in a batch with no upload limits. The tool works from the MP4's existing audio track, so the result downloads directly to your device with nothing uploaded.
Common use cases
- Turning recorded video such as talks, tutorials, and interviews into MP3 audio for listening on the go
- Making ringtones or notification sounds from music videos and game clips
- Pulling the soundtrack out of a video for sampling, remixing, or podcast inserts
How to convert MP4 to MP3 (Step-by-step)
Select or drop your file
Click "Choose Files" or drag and drop your MP4 file directly onto this page.
Set target format
Make sure the output format is set to MP3.
Local conversion
Click convert. Your file is processed entirely in your browser memory - no data is uploaded to our servers.
Save instantly
Once finished, your MP3 file is ready to download.
MP4 is the most widely supported digital multimedia container format. It is universally compatible with all web browsers, smartphones, and media players.
MP3 is the universal standard for digital audio compression. It provides a great balance between file size and sound quality.
Pro tips for MP4 to MP3 conversion
- MP3 cannot be better than the MP4's audio track: if the video's audio is 128 kbps, a 320 kbps MP3 adds size, not quality
- For speech-heavy videos, 128 kbps mono MP3 keeps files small and completely intelligible
- Check the source first: if the MP4 already contains AAC audio, converting to 320 kbps MP3 is transparent, but avoid converting from a video whose audio is already low-bitrate