How to convert an audio file
- Drop an audio file on the box above, or click it to choose one.
- Pick a format: MP3, WAV, M4A or OGG.
- Change the quality or sample rate if you need to. The defaults suit most uses.
- Press the convert button and download the new file.
Which format should I choose
| Format | Good for | Keep in mind |
|---|---|---|
| MP3 | Music and podcasts that must play on almost any device | Lossy. A higher bitrate gives a bigger file and fewer artefacts. |
| WAV | Editing, archiving, handing audio to another program | Uncompressed 16-bit audio, so files are large. |
| M4A (AAC) | iPhone, Apple apps and many phones | Lossy. Needs AAC encoding support in your browser. |
| OGG (Opus) | Small files at voice quality, open format | Some older players and car stereos cannot play it. |
Quality and file size
At 128 kbps an MP3 takes about 1 MB per minute, and at 320 kbps about 2.4 MB per minute. A stereo WAV at 44.1 kHz takes about 10 MB per minute. Converting a lossy file such as an MP3 into a WAV makes a bigger file, but it cannot bring back detail that was already lost.
Tips
- For spoken recordings, 64 to 96 kbps is usually enough.
- Keep the original. Converting from one lossy format to another loses a little more each time.
- 44.1 kHz is the CD standard. Use 48 kHz if the audio goes into a video project.
- To pull the sound out of a video, use Extract Audio from Video.
Limits
The whole file is decoded in memory, so very long recordings can run out of memory on a phone or an older computer. Which formats work depends on the browser. We tested desktop Chrome. If your browser cannot read or write a format, the tool shows a message and you can pick another one.
Privacy
Your audio never leaves your device. The page loads the processing code once, then reads and writes the file inside your browser. There is no upload, no account and no watermark.
FAQ
How do I convert WAV to MP3?
Drop the WAV file, choose MP3, pick 192 or 320 kbps for music (128 kbps is fine for speech), and press convert.
Does converting reduce quality?
Saving to MP3, M4A or OGG discards some data to make the file smaller. Saving to WAV does not add anything back. Convert from the original file whenever you can.
Is there a file size limit?
We do not set one. The practical limit is your device memory, and long files take longer to process.
Why does M4A or OGG fail in my browser?
Those formats need audio encoders that some browsers do not include. Try desktop Chrome or Edge, or choose MP3 or WAV.
Can I convert a video file to audio?
Use the Extract Audio from Video tool. It is built for that job.
Are my files uploaded to a server?
No. The conversion runs in your browser tab and the file stays on your device.