Skip to main content
FormatDrop
Home›Audio›FLAC to OPUS
FLAC
→
OPUS

FLAC to Opus Converter — Free, Online, No Upload

Stream your lossless FLAC library over the web efficiently — Opus delivers transparent quality at a tiny fraction of the bandwidth.

Free · no signup2 free files a day100% in-browser · no upload

Tap to select FLAC files

or click to browse

2 free files per day (2 left today) · Up to 10 MB each · Upgrade for more

✓ Files never uploaded✓ 100% browser-based✓ No account required
Need the reverse?OPUS → FLAC

How to convert FLAC to OPUS online

  1. 1

    Drop your FLAC file

    Drag your Free Lossless Audio Codec file onto the box above, or click it to pick a file.

  2. 2

    Wait a few seconds

    Conversion starts on its own and runs on your device, not on a server.

  3. 3

    Download your OPUS

    Click Download to save the Opus Interactive Audio Codec file.

FLAC vs OPUS: format overview

FLAC

Free Lossless Audio Codec

Josh Coalson / Xiph.Org · 2001

Compression
lossless
Transparency
No
  • ✓ Lossless compression — identical to source
  • ✓ 50–60% smaller than WAV with no quality loss
  • ✗ Not supported on iOS/iTunes natively
OPUS

Opus Interactive Audio Codec

IETF / Xiph.Org · 2012

Compression
lossy
Transparency
No
  • ✓ Best low-bitrate quality of any audio codec
  • ✓ Royalty-free and open standard (RFC 6716)

FLAC magic bytes: 66 4C 61 43

OPUS magic bytes: 4F 67 67 53 (Ogg container)

Why convert FLAC to OPUS?

FLAC is the right format for an archive — lossless, metadata-rich, universally accepted by audiophile software. But for anything that moves audio over a network, FLAC's file sizes are a serious liability. A FLAC track might be 25–40 MB; the same 4 minutes as 192 kbps Opus is about 6 MB. For web audio, self-hosted podcast streaming, WebRTC applications, and browser-based audio delivery, that difference in size directly translates to faster load times and lower bandwidth costs.

Opus is the codec used by Discord, Zoom, WhatsApp, Google Meet, and Spotify's internal streaming layer. All major browsers support it natively in HTML5 audio elements. Developers building web applications that serve audio — music players, podcast apps, interactive audio experiences — increasingly choose Opus for its combination of quality and efficiency. At 96 kbps, Opus is perceptually transparent for music; at 32–48 kbps, voice content sounds excellent. Starting from FLAC ensures the encode is first-generation with no prior lossy artifacts.

The Opus file is usually 75–80% smaller than a CD-quality FLAC, and more than 90% smaller than a 24-bit hi-res one. Opus is not supported by iTunes or Apple Music, so this conversion is suited to web delivery and streaming contexts rather than Apple device playback. For Apple compatibility, FLAC to M4A is the better route.

Quality & file size: FLAC to OPUS

Typical sizes (3-minute song): FLAC 20–40 MB → OPUS 1–3 MB.

OPUS output is encoded at 192 kbps.

Going from lossless FLAC to lossy OPUS removes detail you cannot get back — keep the original if you may need it.

Frequently asked questions

Will the Opus sound as good as the FLAC?
To nearly everyone, yes. Listening tests have found Opus hard to tell from lossless for most music at around 96–128 kbps, and this converter writes 192 kbps. It is still lossy, so keep the FLAC as your master copy.
What apps and services support Opus playback?
Opus is supported by all major browsers, VLC, MPV, Discord, Telegram, WhatsApp, Android, and most modern streaming stacks. It is not natively supported by iTunes or Apple Music.

Your FLAC file never leaves this tab — FormatDrop has no endpoint that receives file data. How it works