About the MP3 Converter
MP3 is the most compatible audio format in the world: it plays on every phone, car stereo, computer, smart speaker and music app. The MP3 Converter turns almost any audio file, including M4A (iPhone voice memos and iTunes), WAV, OGG, FLAC, AAC, OPUS and WEBM, into a standard MP3, and it can also extract the soundtrack from videos.
Choose the bitrate: 128 kbps for podcasts and voice, 192 kbps for high-quality music or 320 kbps for the best quality. Converting to mono halves the file size for speech recordings. The audio is decoded with your browser's Web Audio engine and encoded with the open-source LAME MP3 encoder compiled to JavaScript, so everything happens on your device.
Choosing the bitrate
| Audio | Bitrate | Mono? | Size per minute |
|---|---|---|---|
| Voice notes, lectures, audiobooks | 96 kbps | Yes | about 0.7 MB |
| Podcasts, interviews | 128 kbps | Yes, if one microphone | about 1 MB |
| Music for the phone or car | 192 kbps | No | about 1.4 MB |
| Music you want at the best quality | 320 kbps | No | about 2.4 MB |
Common jobs
- iPhone voice memos (M4A) that will not play on a Windows PC or an older car stereo.
- WAV recordings from a recorder or microphone, which are ten times larger than MP3.
- WhatsApp voice messages (OPUS or OGG) you want to keep or send by email.
A higher bitrate cannot improve a low-quality source. Converting a 96 kbps file to 320 kbps only makes it larger. To keep just part of a recording, use the Audio Cutter.
How to use the MP3 Converter
- Drop your audio or video file into the upload area.
- Choose the MP3 bitrate and whether to convert to mono.
- Wait while the file is decoded and encoded.
- Preview the result and click Download MP3.
Frequently asked questions
Which bitrate should I choose?
128 kbps is fine for speech and podcasts, 192 kbps is great for music, and 320 kbps gives the highest MP3 quality.
Why does my file fail to convert?
Your browser must be able to decode the source format. Chrome and Edge support the widest range; some rare formats and DRM-protected files cannot be converted.
Is there a size limit?
There is no upload limit, but very long files (several hours) need a lot of memory. For best results, convert files under about an hour.
Are my files uploaded?
No. Your media is decoded and converted by your own browser, so private recordings and videos never leave your device.
