Convert MP4 to MP3
Free online MP4 to MP3 converter. Fast, secure, and easy to use.
- HTTPS encrypted transfer
- Files deleted after 30 minutes
- No signup required
We've converted 4,004,702 MP4 files to MP3 and counting!
Join thousands of users who trust LunaConvert for their file conversions every day. Fast, free, and secure.
How it works
- 01
Upload
Drop your file or browse from your device. We support drag-and-drop.
- 02
Convert
Pick the output format and start conversion. Progress updates in real time.
- 03
Download
Save your converted file instantly. Auto-deleted after 30 minutes for privacy.
Frequently asked questions
- How do I convert MP4 to MP3?
- Upload your MP4 file using the converter above, confirm MP3 as the output format, and click Convert. Download your MP3 file when processing completes — usually within a minute for typical file sizes.
- Is MP4 to MP3 conversion free?
- Yes. LunaConvert offers free conversion with a 50 MB file limit and 30-minute file retention. No account is required for the local MVP.
- Are my files kept private?
- Files are transferred over HTTPS, processed on isolated workers, and automatically deleted after 30 minutes. We do not use your files for training or share them with third parties.
- What is the maximum file size?
- Free tier supports files up to 50 MB. Larger files and extended retention will be available with paid plans in a future release.
- Why did my conversion fail?
- Common causes include corrupted MP4 files, unsupported codecs inside the container, or exceeding size limits. Try re-exporting the source file or use a shorter clip, then convert again.
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Uncompromising Security & Privacy
LunaConvert is built on a privacy-first architecture that guarantees your data remains yours alone.
Auto-Deletion
Files are permanently wiped after 2 hours. No backups, no traces left behind.
256-bit Encryption
All transfers are secured with SSL/TLS. Your files are encrypted in transit and at rest.
Zero Data Mining
We never analyze or sell your files. What you convert is strictly your business.