MP3 to MP4 or MP4 to MP3 Converter
MP3 ⇄ MP4 Converter
Convert MP3 to MP4 or MP4 to MP3 directly in your browser. Upload multiple files, select bitrate, and download as ZIP.
📁 Drag & Drop files here
Supported: MP3, MP4
⚙️ How to Use
1. Upload Files
Drag or drop MP3/MP4 files into the upload area.
2. Choose Conversion
Click the ⇄ button to toggle MP3 → MP4 or
MP4 → MP3.
3. Set Bitrate
Choose desired audio bitrate from the dropdown before conversion.
❓ Frequently Asked Questions
Which formats are supported?
MP3 and MP4 are supported for conversion.
Can I upload multiple files?
Yes! Upload and convert multiple files at once.
Can I change the bitrate?
Yes, select desired bitrate from the dropdown next to ZIP button.
Is this tool free?
Yes, completely free and in-browser.
Are my files uploaded?
No, everything is processed locally in your browser.
Can I convert both ways?
Yes — toggle MP3 ⇄ MP4 anytime.
Can I download all as ZIP?
Yes, click “Download All as ZIP”.
Does it work offline?
Yes, all conversions happen offline after page load.
What is the max file size?
Typically up to 1GB per file (browser-dependent).
Is it mobile-friendly?
Fully responsive on all devices.