Convert MP4 to MP3 — Free
Upload your MP4 file and get a MP3 in seconds. No account, no watermark.
How to convert MP4 to MP3
Easily convert your MP4 video files into high-quality MP3 audio with BoltConverter. Our free online tool makes it simple to extract audio from any MP4, perfect for listening to music or podcasts on the go.
BoltConverter processes your files quickly and securely. You can turn your video clips into audio tracks in just a few clicks, without needing to download any software. Start converting now.
Upload MP4 File
Click "Choose File" and select the MP4 video you want to convert.
Start Conversion
Press the "Convert" button to begin the MP4 to MP3 process.
Wait for Processing
Our server-side tool will quickly convert your video to audio.
Download MP3
Once finished, click "Download" to save your new MP3 file.
Frequently asked questions
Is BoltConverter free to use?
Yes, BoltConverter is completely free for everyone to convert MP4 files to MP3 audio.
How long does BoltConverter store my files?
Your files are processed server-side and are immediately deleted from our servers after conversion or after a short period if not downloaded.
Is there a file size limit for conversions?
Yes, BoltConverter supports MP4 files up to 100 MB for conversion to MP3.
What is the quality of the converted MP3 files?
BoltConverter aims to provide high-quality MP3 audio output, preserving the original audio quality from your MP4 file as much as possible.
Can I convert multiple MP4 files at once?
Currently, BoltConverter supports converting one MP4 file to MP3 at a time. Please convert files individually.