Audio converter
Change an audio file's format, bitrate, channels or sample rate. It also takes the sound from a video file. Everything runs on your device.
- 100% free
- Runs in your browser
- No uploads
- Runs on your deviceEvery tool works directly in your browser. No files are uploaded.
- Your privacy mattersYour files never leave your device, so there's nothing for us to store.
- No limitsUse any tool as much as you need. No daily caps, no waiting.
- Completely freeNo signup and no trial to cancel. Ads keep the tools free.
How to convert an audio file
- Add the file. Drop an MP3, M4A, AAC, WAV, OGG, Opus or FLAC file, or a video with sound.
- Pick the format. M4A for everyday use, WAV for editing, OGG for the smallest files.
- Adjust quality, channels and sample rate if needed. "Keep" leaves them as they are.
- Convert and download. Play the result on the page first.
Formats compared
| Format | Compression | One minute of stereo | Plays on |
|---|---|---|---|
| WAV | None | About 10 MB at 44.1 kHz | Everything |
| M4A (AAC) | Lossy | About 1.4 MB at 192 kbps | iPhone, Android, Mac, Windows, browsers |
| OGG (Opus) | Lossy, very efficient | About 0.7 MB at 96 kbps | Browsers, Android, VLC; Apple support varies |
| MP3 | Lossy | About 1.4 MB at 192 kbps | Everything, including old players |
Sample rates and channels
44.1 kHz is the standard for music and 48 kHz for video; both capture everything people can hear. Lower rates such as 22.05 kHz make WAV files smaller and still suit speech. AAC is saved at 44.1 or 48 kHz and Opus always at 48 kHz, so other rates are converted automatically for those formats.
Common problems
- The MP3 option is crossed out: this browser has no MP3 encoder. Use M4A.
- An OGG file won't play in an Apple app: choose M4A for Apple devices.
- "Can't decode the sound": formats like WMA and AMR aren't supported by browsers.
Frequently asked questions
Can I convert WAV to MP3 or M4A to MP3?
Only in browsers that can encode MP3, which most can't yet; this tool doesn't add a separate MP3 encoder. When your browser supports it, MP3 turns on by itself. M4A is the best stand-in: similar or better quality at the same size, and it plays on iPhone, Android, Mac, Windows and in most apps.
Which bitrate should I choose?
128 kbps is fine for speech and most listening on phones. 192 kbps is a safe choice for music. 256 to 320 kbps is for when you'll edit or re-encode the file later. Converting a low-bitrate file to a higher bitrate makes it bigger but doesn't improve it.
Does converting lose quality?
Converting to M4A, OGG or MP3 compresses the sound, which loses detail you usually can't hear at 160 kbps or more. Converting a compressed file to WAV adds no further loss, but can't restore what was lost before.
Should I convert to mono?
Mono halves the data for the same quality, which suits voice recordings, podcasts and phone calls. Keep stereo for music.
Are my files uploaded?
No. The audio is decoded and encoded inside this browser tab.