WAV File Format (Waveform Audio File Format)
WAV (Waveform Audio File Format) is an uncompressed audio format developed jointly by Microsoft and IBM in 1991. WAV stores raw PCM (Pulse Code Modulation) audio data, preserving every sample exactly as recorded with zero compression artifacts. This makes WAV the standard format for audio editing, recording, and production. A CD-quality WAV file (44.1 kHz, 16-bit, stereo) uses approximately 10 MB per minute of audio. While WAV files are too large for casual distribution, they are essential for music production, sound design, broadcast, and any workflow where audio quality must remain pristine. WAV supports sample rates up to 384 kHz and bit depths up to 32-bit float.
Quick Facts
- Extension: .wav
- MIME Type: audio/wav
- Category: audio
Advantages
- Lossless quality with zero compression artifacts
- Universal support across all audio software
- Ideal for editing, mixing, and mastering
- Supports high bit depths and sample rates
- Simple format that is easy to work with programmatically
Disadvantages
- Very large file sizes (10 MB per minute for CD quality)
- Not practical for online distribution or streaming
- Limited metadata support compared to modern formats
- 4 GB file size limit in standard WAV (extensible WAV removes this)
- No built-in compression option (use FLAC for lossless compression)
Common Use Cases
- Music production, recording, and mixing
- Sound design and audio post-production
- Broadcast audio and radio production
- Audio analysis and scientific research
- Master audio delivery format
Technical Details
WAV uses the RIFF container format with PCM audio data stored as sequential samples. Each sample is a signed integer (or float for 32-bit) representing the audio waveform amplitude at that point in time. Stereo audio interleaves left and right channel samples. The format header specifies sample rate, bit depth, channel count, and data size. Broadcast Wave Format (BWF) extends WAV with timestamp, loudness, and originator metadata for broadcast use. RF64 extends WAV beyond the 4 GB limit using a 64-bit data size field.
Frequently Asked Questions about WAV
When should I use WAV instead of MP3?
Use WAV for recording, editing, and production. Use MP3 for distribution, sharing, and playback. WAV preserves full quality for further processing.
Is WAV better quality than FLAC?
Both are lossless and identical in audio quality. FLAC compresses the data to about 60% of WAV size without any quality loss. Use FLAC for lossless distribution and WAV for editing.
Why are WAV files so large?
WAV stores every audio sample without compression. CD-quality audio (44.1 kHz, 16-bit, stereo) produces 10.1 MB per minute.
Can WAV files contain metadata like artist and title?
Yes, but support is limited. WAV INFO chunks and BWF headers can store metadata, but ID3-style tagging is not standard. FLAC provides better metadata support for lossless audio.