MP4 to MP3
Free online converter
Drop an MP4 video and get a clean MP3 audio file in seconds. No watermark, no email, no waiting.
Drop your .mp4 file
or click to browse
Max 25 MB · .mp4 only
How MP4 to MP3 conversion works
Conversion preview
Why use Mictoo for MP4 to MP3?
When MP4 to MP3 is useful
Tips for clean conversion
- Trim huge videos first.
- 128 kbps works for voice and music.
- Default audio track is used.
- DRM-protected video is unsupported.
What happens during conversion
We extract the audio from your MP4 and encode it as MP3.
MP4 vs MP3
| File type | Contains video | Typical size | Best use |
|---|---|---|---|
| MP4 | Yes | Large | Watching, sharing video |
| MP3 | No | Small | Listening, audio only |
Frequently asked questions
Is the MP4 to MP3 converter free?
Yes. No account needed for files up to 25 MB, no time limit, no watermark on the output, no upgrade prompts. Display ads on the marketing pages cover server costs.
Does conversion reduce audio quality?
Slightly. MP3 is a lossy format, but at 128 kbps the quality loss is inaudible for voice and typical music playback. If you need lossless, convert to WAV instead.
Are uploaded files stored?
No. Your MP4 lands on Vercel Blob storage just long enough to be converted, then it is deleted. The resulting MP3 is purged within the hour. Save the MP3 locally.
Can I convert a large MP4?
The current upload limit is 25 MB. If your MP4 is larger, trim it in QuickTime, the Photos app, or another video editor before uploading.
Does it work on mobile?
Yes. The page is mobile-friendly and uploads work from iOS Safari and Android Chrome. On iPhone, share the video to Files first so the picker can reach it.