Bitrate in audio works exactly like bitrate in video — it's the amount of data used per second of audio. Higher bitrate means more data, which generally means better quality, but at a certain point the improvement becomes inaudible to most people on most equipment.
What the Numbers Mean
Bitrate is measured in kilobits per second (kbps). Common audio bitrates:
| Bitrate | Quality level | Typical use |
|---|---|---|
| 64 kbps | Usable but limited | Low-bandwidth streaming, voice calls |
| 96 kbps | Decent for voice | Podcasts, audiobooks, speech |
| 128 kbps | Good general quality | Everyday music, streaming |
| 192 kbps | High quality | Music where quality matters |
| 256 kbps | Very high quality | Near-transparent for music |
| 320 kbps | Maximum MP3 quality | Audiophile MP3, close to lossless |
Voice vs Music
Voice and music have different frequency requirements:
- Voice/speech is mostly in a frequency range well-covered by 96–128 kbps. Higher bitrates add little for a podcast or voice memo.
- Music covers a much wider frequency range, and complex musical content — orchestras, detailed acoustic recordings — benefits more from higher bitrates.
For podcasts and lectures, 128 kbps is a generous and standard choice. For music you want to preserve well, 192 kbps or higher makes sense.
The "Ladder" Problem
Converting audio upward never improves quality:
- A 128 kbps MP3 converted to 320 kbps is just a larger file with the same sound.
- A 320 kbps MP3 converted to 128 kbps creates a smaller, lower-quality file.
Always work from the highest-quality source available, and compress downward only when needed. Keep lossless originals (WAV or FLAC) if you have them — see MP3 vs WAV vs FLAC vs M4A.
File Size at Different Bitrates
A 3-minute song:
| Bitrate | File size |
|---|---|
| 128 kbps | ~2.8 MB |
| 192 kbps | ~4.2 MB |
| 256 kbps | ~5.6 MB |
| 320 kbps | ~7 MB |
For compressing audio to fit a size limit, Audio Compressor handles this. For the broader quality picture, see lossless vs lossy audio: what you actually hear.
Streaming vs Downloaded Files
Streaming services typically use 128–256 kbps AAC or Ogg Vorbis for their standard quality tiers. Premium tiers and lossless streaming options have expanded — several platforms now offer 16-bit or 24-bit lossless options for subscribers with good enough headphones to benefit. For most people on standard earphones, the difference between 320 kbps and a lossless tier is genuinely inaudible, and the standard tier saves significant data usage on mobile. For compressing audio files to a specific bitrate target, Audio Compressor gives control over the output bitrate. For a broader understanding of how the quality trade-offs work, see lossless vs lossy audio: what you actually hear.
