Audio Format Comparison

WAV vs Opus — Uncompressed vs Modern Codec

WAV (Waveform Audio File Format) stores uncompressed PCM audio — every sample is stored as-is, with no quality loss. A typical CD-quality WAV file runs about 10 MB per minute. Opus is a lossy codec that achieves near-transparent quality at 128 kbps (about 1 MB/min) — a 10x file size reduction. The tradeoff: WAV is lossless and universally compatible; Opus requires modern software and sacrifices some audio fidelity (though at high bitrates the difference is inaudible).

WAVvsOpus

Quick Verdict

Use WAV when…

Use WAV for recording (never compress during capture), audio production and editing, professional audio exchange between DAWs, sound effects in games, and archiving masters — WAV is the source-of-truth format.

Use Opus when…

Use Opus for distribution, streaming, web audio, podcasts, voice messages, and anywhere file size matters — at 128 kbps Opus is transparent for most listeners, and the file is 10x smaller than WAV.

WAV vs Opus: Feature Comparison

Feature	WAV	Opus
Compression	None (PCM)	Lossy (SILK + CELT)
Quality	Perfect (lossless)	Near-transparent at 128+ kbps
File size (1 min stereo)	~10 MB	~1 MB at 128 kbps
Browser streaming	Supported but large	Ideal (small, fast-starting)
DAW compatibility	Universal	Limited (most DAWs use WAV/AIFF)
Latency	None (raw PCM)	As low as 5 ms
Metadata	Limited (LIST chunk)	Vorbis comments in OGG container

When WAV wins

✓Compression: None (PCM)
✓Quality: Perfect (lossless)
✓File size (1 min stereo): ~10 MB

When Opus wins

✓Compression: Lossy (SILK + CELT)
✓Quality: Near-transparent at 128+ kbps
✓File size (1 min stereo): ~1 MB at 128 kbps

Frequently asked questions

Should I record in WAV and then convert to Opus?

Yes — always record in WAV (or another lossless format). Lossless recording preserves every detail for editing. Once the final mix is ready, export to Opus (or MP3/AAC) for distribution. Never record directly to a lossy format — you cannot get the quality back.

At what bitrate does Opus sound the same as WAV?

Most listeners cannot distinguish Opus at 128 kbps from WAV on typical music through headphones. Critical listeners may hear subtle differences in complex high-frequency content. At 192 kbps, Opus is transparent to essentially all listeners. At 320 kbps, it is indistinguishable from WAV for practical purposes.

Can I convert WAV to Opus without quality loss?

Technically no — Opus is lossy, so converting WAV to Opus always involves some quality reduction. At 128+ kbps, the loss is generally inaudible. Use FFmpeg: `ffmpeg -i input.wav -c:a libopus -b:a 128k output.opus`. Never convert Opus back to WAV and then to Opus again — each lossy-to-lossy conversion degrades quality further.