FLAC to Opus Converter

Convert lossless FLAC audio to Opus — the modern codec that delivers excellent quality at half the file size of MP3. Ideal for web streaming, Discord bots, and WebRTC applications.

FLACOpus

Drop your FLAC file here or click to browse

FLAC (.flac) · Max 20 MB

Free — 10-second preview, 5 conversions/month. Upgrade for unlimited

What is FLAC?

Lossless compression. Perfect quality at roughly half the size of WAV. The choice for audiophiles and archiving.

What is Opus?

Modern open-source codec. Best quality-per-bit of any lossy format. Used by Discord, WebRTC, and modern browsers.

Why Convert FLAC to Opus?

FLAC files are enormous by design — they're meant for archiving. But when you need to stream or serve audio on the web, FLAC is impractical. Opus delivers audio quality that rivals FLAC at 128 kbps while keeping file sizes tiny — a 30MB FLAC becomes roughly 3MB as Opus. Discord uses Opus for voice channels. YouTube uses Opus in WebM containers. WebRTC (the protocol behind browser calls and conferencing tools) mandates Opus. If you're building web applications, streaming audio services, or Discord bots, converting your FLAC masters to Opus is the right move. The conversion is one-way lossless → lossy, so keep your FLAC as the master archive.

Who Uses This Converter

Web audio delivery

Serve audio on the web at a fraction of the bandwidth. Opus at 96 kbps sounds like FLAC and loads 10x faster.

Discord bots

Pre-encode your audio library to Opus for Discord bots. Reduces runtime CPU usage and latency in voice channels.

WebRTC applications

WebRTC mandates Opus for audio. Convert your FLAC masters to Opus for use in browser-based communication tools.

Podcast and streaming CDN

Smaller files mean lower CDN costs and faster load times. A FLAC podcast episode that was 200MB becomes under 30MB as Opus.

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.