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 to Opus is the maximum-efficiency delivery encode: a lossless master feeding the most capable lossy codec in use. Because the source is FLAC, the Opus encoder works from the complete original signal — no inherited artifacts, no stacked generations — and because it is Opus, the output is dramatically small: speech becomes transparent around 48-64 kbps, and music holds up at 96-128, sizes MP3 needs double or triple the bits to match. That combination fits specific jobs. Podcast and spoken-word distribution, where an hour of speech lands under 30 MB at excellent quality. Web applications serving audio at scale, where every modern browser decodes Opus natively and bandwidth is a bill. Game and app builds trimming download size. Personal listening copies of a FLAC library for storage-tight devices — with the caveat that Opus is not universal: Apple's Music app, car stereos, and older hardware often skip it, so for a general library M4A or MP3 copies travel further. The archival rule stays the same as ever: the FLAC remains your master; the Opus files are delivery copies you can regenerate at any bitrate whenever needs change. Conversion runs locally in your browser, and your collection never leaves your machine.

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.