Audio Converter
Change an audio file into the format your device, app or project needs. Mix input formats in one batch and convert them all on your own computer.
- Files stay on your device
- No sign-up
- Free to use
How to use Audio Converter
- Drop your audio files onto the upload area. MP3, WAV, FLAC, M4A, AAC, OGG, Opus, WMA and AIFF are accepted.
- Choose the output format.
- For MP3, M4A, OGG and Opus, choose a bitrate; WAV and FLAC are lossless and need none.
- Select Convert audio, listen to the result and download.
Audio Converter features
Six output formats
MP3, WAV, FLAC, M4A (AAC), OGG (Vorbis) and Opus.
Lossy and lossless
Choose a compact compressed format or keep full quality with WAV or FLAC.
Bitrate control
From 96 to 320 kbps for the compressed formats.
Batch conversion
Convert up to 20 files at once and download them together.
Preview player
Listen to converted files in the page.
On-device processing
Recordings and music are not uploaded.
When to use Audio Converter
- Converting WAV or FLAC files to MP3 for a phone or car stereo.
- Turning an M4A voice memo into an MP3 that any app can open.
- Producing WAV files for audio or video editing software.
- Reducing the size of recordings before sharing them.
Audio Converter FAQ
Which format should I choose?
MP3 for maximum compatibility. M4A (AAC) or Opus for better quality at the same size on modern devices. FLAC to keep full quality at about half the size of WAV. WAV for editing software that expects uncompressed audio.
Will converting improve sound quality?
No. Converting a lossy file such as an MP3 to WAV or FLAC makes it bigger without restoring what was lost. Start from the best source you have.
Does converting between lossy formats lose quality?
Yes, slightly. Each lossy encoding discards some information, so converting MP3 to OGG, for example, compounds the loss. Use a reasonably high bitrate to keep it inaudible.
What bitrate do I need?
128 kbps is acceptable for speech, 192 kbps is a good standard for music, and 256–320 kbps is for critical listening. Opus sounds good at lower bitrates than MP3.
Are tags such as title and artist kept?
Basic metadata is carried across where the output format supports it. Embedded cover art may not be preserved.
Lossless and lossy audio
Uncompressed audio, as stored in WAV and AIFF files, records the sound wave as tens of thousands of samples per second. It is exact and large: about ten megabytes per minute at CD quality. Lossless compression such as FLAC packs the same samples into roughly half the space and restores them perfectly on playback.
Lossy formats go further by removing sounds the ear is unlikely to notice, such as quiet tones masked by louder ones. MP3 pioneered this in the 1990s. AAC, Vorbis and Opus are later designs that achieve the same perceived quality at lower bitrates. The choice between them is mostly about where the file needs to play: MP3 works everywhere, while the newer formats are more efficient.
Sample rate and bit depth are separate from the format. CD audio uses 44,100 samples per second at 16 bits, which covers the full range of human hearing; video productions commonly use 48,000. Higher rates such as 96,000 are useful during recording and editing but give no audible benefit for listening. Mono halves the data needed for speech recordings such as podcasts and voice notes, where stereo adds little. Matching these settings to the content often saves more space than changing the format.