Audio to MP3 Converter
Convert your own audio or video files to MP3 in your browser.
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How to Use
- 1Drop in one or more audio or video files from your device.
- 2Choose a bitrate, and mono if you want a smaller file.
- 3Click Convert to MP3, then download each MP3 or all of them as a ZIP.
Features
- Reads WAV, M4A, AAC, OGG, FLAC, MP3, MP4 and WebM
- Pulls the audio track out of video files
- Bitrates from 64 kbps for voice up to 320 kbps
- Stereo or mono output
- Convert up to 20 files at once and download them as a ZIP
- Runs fully offline in your browser, nothing is uploaded
Example
Input
interview.m4a (18.4 MB)
Output
interview.mp3 (6.2 MB at 192 kbps)
Convert audio and video files you already have into MP3, entirely in your browser. Drop in a WAV, M4A, AAC, OGG, FLAC, MP4 or WebM file, pick a bitrate, and download the MP3. The file is decoded and encoded on your own device, so nothing is ever uploaded.
Why convert to MP3?
MP3 plays on practically everything: old car stereos, smart TVs, basic phones, messaging apps, podcast hosts and every computer. Other formats are often better in theory but less compatible. Voice memos from an iPhone are M4A, screen recordings are MP4 or WebM, studio exports are WAV or FLAC. Converting them to MP3 gives you a smaller file that opens anywhere.
Choosing a bitrate
| Bitrate | Good for | Size per minute (stereo) |
|---|---|---|
| 64 kbps (mono) | Speech: lectures, interviews, voice notes | ≈ 0.5 MB |
| 128 kbps | Podcasts, casual music listening | ≈ 1 MB |
| 192 kbps | Music, the default; hard to tell from the source for most listeners | ≈ 1.4 MB |
| 256 kbps | Higher-quality music | ≈ 1.9 MB |
| 320 kbps | Maximum MP3 quality, archiving music | ≈ 2.4 MB |
Choose mono for recordings of a single voice. It halves the data without any audible loss for speech, so 64 kbps mono sounds as clear as 128 kbps stereo for a lecture.
Quality expectations
- MP3 is a lossy format. Converting from WAV or FLAC at 192 kbps or above sounds excellent, but it is not bit-for-bit identical.
- Converting from one lossy format to another, such as AAC or OGG to MP3, loses a little more each time. Use the highest bitrate if the source is already compressed.
- A higher bitrate than the source cannot add quality. Converting a 128 kbps file to 320 kbps only makes it larger.
Converting several files
Add up to 20 files and convert them in one go at the same bitrate and channel setting. Each file shows its own progress and a player so you can check the result, and you can download the MP3s one by one or all together as a ZIP. Files are processed one after another to keep memory use down.
Video files
Drop in an MP4 or WebM video and the converter extracts the soundtrack, which is handy for turning a recorded talk, class or meeting into something you can listen to on the go.
Your files, your device
Decoding and MP3 encoding both run in your browser, so recordings, which are often private, never leave your device. This tool converts files you already have; it does not download from streaming sites. Only convert material you own or have the right to use.
Files up to about 300 MB work well. For very long recordings, a lower bitrate and mono keep the conversion quick and the result small.