Free Audio Converter Online
Convert audio files between MP3, WAV, OGG, and AAC formats. Batch convert multiple files at once. No upload to any server.
MP3, WAV, OGG, AAC, FLAC, M4A · multiple files supported
Output Format
How to Convert Audio
- Select your target format (MP3, WAV, OGG, or AAC) above.
- For MP3 and AAC, adjust the bitrate (128-320 kbps). Higher bitrate = better quality but larger file.
- Drop or select one or more audio files.
- Click 'Convert All' to start the conversion.
- Download individual files or all at once as a ZIP.
Audio Format Guide
- MP3 · Most widely supported format. Good compression and quality. Use for general purposes and portability.
- WAV · Lossless format. No quality loss but larger file sizes. Best for professional audio editing and archiving.
- OGG · Open-source format with excellent compression. Smaller than MP3 at same quality. Good for web and gaming.
- AAC · Modern format used by iTunes and Apple devices. Better quality than MP3 at same bitrate. More efficient compression.
When to Use Each Format
- Convert to MP3 · Maximum compatibility. Use for music players, YouTube, and devices from 2000s-2010s.
- Convert to WAV · For professional audio work, archiving, or when you need lossless quality for further editing.
- Convert to OGG · For websites, game development, and scenarios where file size matters more than maximum compatibility.
- Convert to AAC · For Apple devices, iTunes libraries, and modern apps where AAC is preferred.
Bitrate Explained
- 128 kbps · Adequate for speech and podcasts. Noticeable quality loss on music.
- 192 kbps · Good for general listening. Suitable for most streaming services.
- 256 kbps · Very high quality. Recommended for music. Imperceptible difference from lossless.
- 320 kbps · Maximum MP3/AAC quality. Use when quality is critical and file size is not a concern.
Frequently Asked Questions
What happens to audio quality when converting?
Converting to WAV is lossless (no quality loss). Converting to MP3, AAC, or OGG applies lossy compression. At 256-320 kbps, the quality difference is imperceptible to most listeners. Lower bitrates trade audio fidelity for smaller file sizes.
Can I convert multiple audio files at once?
Yes! Add multiple files and they will be converted sequentially. You can download them individually or all at once as a ZIP file for convenience.
Does the conversion preserve metadata like artist and title?
The conversion preserves the audio content. However, metadata (ID3 tags) may not be transferred. You may need to re-tag your files with artist, album, and title information in your media player.
Are my audio files uploaded to a server?
No. All conversion happens in your browser using FFmpeg.wasm. Your audio files never leave your device.