FLAC to Opus Converter
Convert FLAC to Opus free — no upload, no signup
To convert FLAC to Opus, drop your FLAC 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. Get the smallest high-quality copies of FLAC music.
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 FLAC to Opus
Add your FLAC files
Drag and drop FLAC 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 FLAC to Opus?
Opus at 128–160 kbps rivals much larger MP3s, ideal for phones with limited storage.
What happens when you convert FLAC to Opus?
Fylo encodes Opus at 48 kHz, 160 kbps by default.
How does Fylo convert FLAC to Opus?
Fylo decodes the FLAC audio in the FLAC 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 ≈ 18–24 MB as FLAC 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 FLAC and Opus?
FLAC (Free Lossless Audio Codec) was released in 2001 and later maintained by the Xiph.Org Foundation. It compresses PCM audio like a ZIP file compresses data: nothing is thrown away, so a FLAC decodes to exactly the same samples as the source WAV, typically at 50–70% of the size.
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: FLAC format guide · Opus format guide
| Property | FLAC | Opus |
|---|---|---|
| Compression | Lossless | Lossy |
| Typical bitrate | ≈ 700–1,100 kbps | 24–160 kbps |
| 3-minute song | ≈ 18–24 MB | ≈ 2.9 MB at 128 kbps |
| Tags and cover art | Yes (with cover art) | Yes (Vorbis comments) |
| Compatibility | Android, Windows 10+, macOS, most players and hi-fi gear | Browsers, Android, WhatsApp, Discord; partial on Apple |
| Best for | Archiving music without quality loss | Voice notes, podcasts, streaming at low bitrates |
| Introduced | 2001 | 2012 |
Frequently asked questions
Is 128 kbps Opus enough for music?
For most listeners, yes.
Will 44.1 kHz audio change?
Opus works at 48 kHz internally; the change is inaudible.
Is my FLAC file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your FLAC file is read directly from your device and never sent anywhere.
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