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Have questions about converting MP3 audio to MP4, experiencing a browser issue, or want to suggest an improvement? We are here to help.
Response Time
We review support requests and reply promptly.
Within 24 HoursSend Us a Message
Fill out the form below and our team will get back to you.
Common Technical Questions
Why did my conversion take longer or stall?
Our conversion engine runs locally via WebAssembly. Very large audio files (over 100 MB) or multiple heavy browser tabs can consume device RAM. Closing unused tabs and ensuring hardware acceleration is enabled in browser settings will resolve most issues.
Are my files ever stored or shared?
Never. All encoding happens directly in your browser memory. Your audio and images are never uploaded to any remote server. Read our Privacy Policy and Cookies Policy for complete details.
Can I use generated videos commercially?
Yes. Videos you create with MP3zuMP4 are 100% yours to monetize and publish on YouTube, social media, or commercial platforms without watermarks, subject to our Terms of Service.
Bug Reporting Checklist
When reporting a conversion error, please include the following details so we can assist you quickly:
- Browser & Device: E.g., Chrome 124 on Windows 11, Safari on iPhone 15, or Firefox on macOS.
- Audio Specs: File size in MB, duration, and approximate bitrate.
- Selected Tool: E.g., With Image, Visualizer, or HD 1080p.
- Error Message: Any specific error text or progress percentage where the process stopped.