1. Open the converter
Go to the ConvertMP4 converter. The tool runs in a modern web browser.
2. Select your MP4 file
Click Choose MP4 or drag an MP4 onto the upload area. Your browser will read the file from your device.
3. Choose MP3 quality
Select the bitrate you want. A lower bitrate usually produces a smaller file; a higher bitrate usually produces a larger file.
4. Start conversion
Click Convert to MP3. The page decodes the audio and encodes the result in your browser. Large videos can require significant memory and processing time.
5. Preview and download
When conversion finishes, use the audio player to check the result. Click the download button to save the MP3.
If conversion fails
Make sure the file is a valid MP4 and that it contains an audio track. Some MP4 files use audio codecs that a browser cannot decode. Trying a different browser can also help when the device has codec or memory limitations.
Supported workflow
This site is intended for personal, lawful conversion of files you are permitted to use. Always make sure you have the necessary rights to copy or convert the media.