Online Audio Converter
Convert audio between MP3, WAV, M4A, AAC and FLAC right in your browser. A free MP3 and audio file converter with no upload and no signup. Your files stay on your device.
Drop your audio file here
or click to select a file
Supports MP3, WAV, AAC, FLAC, OGG, M4A, Opus and more (up to 500MB on desktop, 100MB on mobile)
How It Works
1. Upload your audio
Pick any audio file. MP3, WAV, M4A, FLAC, OGG and more all work, and it stays on your device.
2. Pick a format
Choose MP3, WAV, AAC or FLAC, whatever you need.
3. Download
Save your converted file and you are done.
Popular audio conversions
Supported audio formats
Sondra reads a wide range of input formats, including MP3, WAV, AAC, FLAC, OGG, M4A, Opus, AIFF and WMA. Drop in whatever you have and convert it to the format you need.
For the output you can pick MP3 for the smallest, most universal file, AAC for a great balance of size and quality, or WAV and FLAC for lossless audio. Popular conversions like M4A to MP3, WMA to MP3, FLAC to MP3 and WAV to MP3 are all done in seconds.
Convert audio files online, free and private
Sondra is a free audio converter that runs entirely in your browser. Change WAV to MP3 to save space, M4A to MP3 for wider support, or FLAC to MP3 for easy sharing. You can also go the other way to WAV and FLAC when you want lossless quality. No account, and nothing is uploaded.
Each format has its place. MP3 and AAC are small and play almost everywhere. WAV and FLAC keep full quality but are larger. Since everything runs locally with FFmpeg, your audio never leaves your device, so it is a safe choice for private recordings, client work or unreleased tracks.
Everything runs in your browser, so your audio is never uploaded and there is no waiting in a queue. It works on any device with a modern browser, with no signup needed.