Compress FLAC to Opus
Need smaller audio files? Converting FLAC to Opus dramatically reduces file size. A 50MB file becomes 5MB. Perfect for email, sharing, and storage.
Drop your FLAC file here or click to browse
FLAC (.flac) · Max 20 MB
FLAC files are uncompressed and huge. Opus uses lossy compression to shrink them by 90% or more. The size reduction is significant for sharing, uploading, and storage.
For email attachments, 128-192kbps works well. For music sharing, use 256-320kbps. AudioUtils lets you drop your file and convert instantly. No upload to a server, no waiting.
FLAC is lossless. Converting to Opus reduces file size at the cost of some audio data. Use a high bitrate to minimize loss. Choose the right bitrate for your use case. Higher bitrate means better quality but larger files.
Frequently Asked Questions
Is Opus better than MP3 for web streaming?
Yes, significantly. Opus at 64 kbps sounds better than MP3 at 128 kbps in blind listening tests. It also has lower latency (important for real-time audio) and is royalty-free. For web use, Opus is objectively the superior choice.
Will I lose quality converting FLAC to Opus?
Yes — Opus is lossy, FLAC is lossless. The original audio data is compressed. At 128 kbps, the difference is imperceptible to most listeners. Always keep your FLAC as the master; derive Opus from it rather than re-converting between lossy formats.
What browsers support Opus?
Chrome, Firefox, Edge, and Safari (since 2021) all support Opus natively in WebM or OGG containers. Opera and mobile browsers also support it. Opus is safe to use for any modern web deployment.
Can I use Opus files in Discord bots?
Yes. Discord's voice system uses Opus internally. Providing pre-encoded Opus files to Discord.js or discord.py bots avoids re-encoding and reduces CPU usage on your bot server.
Is this converter free?
Yes. Free users get 5 conversions per month. The output is limited to the first 10 seconds as a preview, with a 20MB input file size limit. Upgrade to Pro for unlimited, full-length conversions.
About FLAC
Lossless compression. Perfect quality at roughly half the size of WAV. The choice for audiophiles and archiving.
About Opus
Modern open-source codec. Best quality-per-bit of any lossy format. Used by Discord, WebRTC, and modern browsers.