Audio converter
Convert audio between MP3, WAV, M4A, OGG, FLAC and Opus, many files at once.
Runs in your browser. Your file is never uploaded.
Convert audio files to MP3, WAV, M4A, FLAC, OGG or Opus
Audio Converter changes the format of songs, recordings and sound effects. Turn a WAV into an MP3 that's a tenth of the size, an M4A from an iPhone into an MP3 for anything, or a FLAC into a format your car stereo plays. Convert many files at once and download them as a ZIP.
Choose the quality for MP3, M4A and Opus, from 320 kbps for music down to 64 kbps for speech. The conversion runs in your browser, so your files stay on your device.
Audio converter in short
Add one or more audio files, or videos to take the sound from, then pick the format and quality, then select Convert and download them one by one or as a ZIP. It's free, there's no sign-up, and it runs in your browser, so the file never leaves your device.
How to use Audio converter
- 1
Add your files
One or more audio files, or videos to take the sound from.
- 2
Pick the format
MP3, WAV, M4A (AAC), OGG (Vorbis), FLAC or Opus. Each option says what it's best for.
- 3
Choose the quality
For MP3, M4A and Opus: High (320 kbps), Good (192 kbps), Smaller (128 kbps) or Smallest for speech (64 kbps).
- 4
Convert and download
Download each file, or all of them as a ZIP.
Good to know
- Converting a lossy file such as MP3 to a lossless one such as WAV or FLAC makes it bigger but can't bring back lost quality.
- The first time you use an audio or video tool, your browser downloads our 31 MB processing engine. It's kept for next time, so later runs start straight away.
- This tool runs in your browser. Very large files depend on your device's memory.
Common conversions
WAV to MP3
Shrink large recordings so they're easy to email and share.
M4A to MP3
Make iPhone voice memos and iTunes files play on any device.
FLAC to MP3 or M4A
Fit a lossless music library onto a phone.
MP3 to WAV
Get an uncompressed file for editing software or a CD.
Why use ConvertFile
Batch conversion
Convert a whole folder of files in one go and download a ZIP.
Quality you choose
Pick a bitrate, or lossless WAV and FLAC.
Never uploaded
Your audio is processed by your own browser and handed back as a download. It isn't sent to our servers, so there's nothing for anyone to see, keep or leak.
Files up to 500 MB free
Files up to 500 MB work without an account, and Pro raises that to 2 GB. Big files are read from your disk as they're processed, not loaded into memory first.
Supported formats
- Opens
- MP3WAVM4AAACOGGFLACOpusWMAAIFFMP4, MOV and other videos
- Saves as
- MP3WAVM4A (AAC)OGG (Vorbis)FLACOpus
Converting a specific format?
Audio converter: common questions
- How do I convert WAV to MP3 for free?
- Add the WAV files, pick MP3 and a quality, and select Convert. They're converted in your browser and never uploaded.
- Which audio format is best?
- MP3 plays everywhere. M4A sounds slightly better at the same size and suits Apple devices. FLAC and WAV keep every detail but are much larger. Opus gives the smallest files for speech.
- Will converting MP3 to WAV improve quality?
- No. The file gets bigger, but detail lost when the MP3 was made can't come back.
- How many files can I convert at once?
- Up to your plan's files-per-run limit, each up to 500 MB without an account.
- Is Audio converter free?
- Yes. Audio converter is free, works without an account and adds no watermark, for files up to 500 MB. Pro raises that to 2 GB.
- Are my files uploaded to a server?
- No. Audio converter runs in your web browser, so the file is read on your own device and never sent to ConvertFile.
- Does Audio converter work on Mac, Windows, Android and iPhone?
- Yes. It runs in any modern web browser, with nothing to install. Very large files work best on a desktop or laptop, because in-browser tools use your device's memory.