WAV to Opus Converter
Convert WAV to Opus free — no upload, no signup
To convert WAV to Opus, drop your WAV audio files into the box below and click Convert. Fylo converts with ffmpeg running inside your browser, so nothing is uploaded and there's no signup or watermark. Opus is ideal for voice recordings at tiny sizes.
Drop audio files here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
Advanced
How to convert WAV to Opus
Add your WAV files
Drag and drop WAV files into the box or tap to choose them. The converter engine (about 31 MB) downloads once, the first time you convert.
Pick a bitrate
192 kbps suits music and 128 kbps or less suits speech. Sample rate and mono/stereo are under Advanced.
Convert and download
Click Convert, then download each Opus file or all of them as one ZIP.
Why convert WAV to Opus?
Voice notes, podcasts and streaming apps benefit from Opus's excellent quality at low bitrates.
What happens when you convert WAV to Opus?
Fylo encodes Opus at 48 kHz, 160 kbps by default. For speech, 64–96 kbps is plenty.
How does Fylo convert WAV to Opus?
Fylo decodes the PCM audio in the WAV with ffmpeg compiled to WebAssembly and encodes it with FFmpeg's native Opus encoder at 160 kbps and 48 kHz in an Ogg container. Going from lossless to lossy is where the big saving happens: a 3-minute song is ≈ 32 MB as WAV but ≈ 2.9 MB at 128 kbps as Opus. Opus always runs at 48 kHz, so the audio is resampled if needed.
What's the difference between WAV and Opus?
WAV was introduced by Microsoft and IBM in 1991 and, like AVI, uses the RIFF container. Most WAVs hold uncompressed PCM audio: CD quality (44.1 kHz, 16-bit, stereo) runs at 1,411 kbps, or about 10.6 MB per minute.
Opus is an open, royalty-free codec standardised by the IETF as RFC 6716 in 2012. It blends speech technology from Skype's SILK with music coding from Xiph's CELT, so it handles both voice and music well. Files are usually stored in the Ogg container with the .opus extension.
Learn more: WAV format guide · Opus format guide
| Property | WAV | Opus |
|---|---|---|
| Compression | None (PCM) | Lossy |
| Typical bitrate | 1,411 kbps (CD quality) | 24–160 kbps |
| 3-minute song | ≈ 32 MB | ≈ 2.9 MB at 128 kbps |
| Tags and cover art | Limited | Yes (Vorbis comments) |
| Compatibility | Universal on computers; editors and DAWs | Browsers, Android, WhatsApp, Discord; partial on Apple |
| Best for | Recording, editing, mastering | Voice notes, podcasts, streaming at low bitrates |
| Introduced | 1991 | 2012 |
Frequently asked questions
How small can voice recordings get?
At 64 kbps, an hour of speech is about 29 MB.
Does Opus work on WhatsApp?
WhatsApp voice notes are Opus files, so yes.
Is my WAV file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your WAV file is read directly from your device and never sent anywhere.
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