How big will the file be?
Uncompressed audio stores every sample: 44,100 per second, 16 bits each, per channel. Lossy formats instead spend a fixed number of bits per second, discarding sounds your ear is least likely to notice. Slide to compare.
11.0× smaller · Transparent for most speech, decent for music
Formula: size in bytes = bitrate (bits/s) × seconds ÷ 8. A CD-quality stereo WAV runs at 1,411 kbps.
Popular conversions
- MP4 to MP3
- M4A to MP3
- WAV to MP3
- OGG to MP3
- AAC to MP3
- OPUS to MP3
- WebM to MP3
- FLAC to MP3
- MP3 to WAV
- MP4 to WAV
- M4A to WAV
- OGG to WAV
- FLAC to WAV
- MP3 to OGG
Choosing a format
| Format | Type | Best for |
|---|---|---|
| MP3 | Lossy | Sharing, podcasts, anything that must play everywhere |
| WAV | Uncompressed | Editing, mastering, handing files to another app |
| OGG (Opus) | Lossy | Smallest files at good quality; web, games, voice |
Questions
Which formats can I convert?
Input: anything your browser can decode, including MP3, WAV, M4A, AAC, OGG, Opus, FLAC, WebM and the audio of most MP4 videos. Output: MP3, WAV or OGG (Opus).
Is converting to a higher bitrate better?
No. Converting a 128 kbps MP3 to 320 kbps makes a bigger file with the same quality; lost detail cannot come back. Match or go lower than the source.
Are files uploaded?
No. Decoding and encoding run in your browser, so even large batches stay on your device.
Why is OGG greyed out?
OGG export uses the browser's built-in Opus encoder (WebCodecs). Very old browsers lack it; use MP3 or WAV instead, or update the browser.