audio
MP4 to MP3 converter
Free online MP4 → MP3 conversion. 3 free per day, no signup. Files auto-delete after 24 hours.
Common questions
- How do I convert MP4 to MP3?
- Upload your MP4 file using the form above, select MP3 as the target format, and click "Convert". The first 3 conversions per day are free. Your file is processed on our servers and deleted after 24 hours.
- Is converting MP4 to MP3 free?
- Yes, the first 3 conversions per day are free with no account required. After that, the Pro plan (€9/month) gives you 100 conversions per day, Bulk (€19/month) is unlimited, and the API plan (€49/month) supports programmatic conversion at scale.
- Will the output file be the same quality as the source MP4?
- Some quality loss is unavoidable when going from MP4 to MP3 because the formats use different compression approaches. We optimize for visual or audible fidelity within the target format's constraints.
- What's the maximum MP4 file size I can convert?
- Free: 10 MB. Pro: 100 MB. Bulk: 1 GB. API: 5 GB. Files larger than the limit return a 413 error with the exact size and the smallest tier that would accept it.
- Is the MP4 to MP3 conversion safe?
- Yes. Files are uploaded over HTTPS, processed in isolated workers, and deleted from our servers within 24 hours. We never inspect file contents or share data with third parties. The conversion happens on our infrastructure (not in your browser), so the source is briefly stored - see our Privacy page for the exact retention policy.
- Can I convert MP4 to MP3 in bulk via API?
- Yes. The API plan (€49/month) gives you a Bearer token to authenticate at https://bulkconvert.io/api/v1/convert. Each call accepts a source URL and target format, returns a download URL. Up to 10,000 conversions per month. See /docs/api for the full reference.