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OPUS
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Opus to FLAC Converter — Free, Online, No Upload

Your audiophile media server can't read Opus — convert to FLAC and play your files on any high-end audio system.

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

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

How to convert OPUS to FLAC online

  1. 1

    Drop your OPUS file

    Drag your Opus Interactive 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 FLAC

    Click Download to save the Free Lossless Audio Codec file.

OPUS vs FLAC: format overview

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)
  • ✗ Not supported on iOS/macOS natively
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

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

FLAC magic bytes: 66 4C 61 43

Why convert OPUS to FLAC?

Opus files turn up in some specific and increasingly common places: Discord voice messages, WhatsApp voice notes, Telegram audio, WebRTC recordings, and browser-captured audio all use Opus as their codec. When those recordings need to be edited in professional audio software, archived long-term, or played back on hi-fi hardware, Opus creates an immediate problem — most professional DAWs, audiophile music players, and high-end hardware simply don't recognise it.

FLAC is the format that professional and audiophile software understands. Audacity, Reaper, iZotope RX, and most broadcast audio editors can open FLAC without any additional plugins. Roon, Audirvana, foobar2000, and essentially all hi-fi network streamers treat FLAC as a primary format. Converting Opus to FLAC stores the decoded Opus audio in a FLAC container without any further encoding — the audio is decoded once and written to FLAC, with no additional quality loss from that point forward.

The honest limitation is that the FLAC output won't sound better than the Opus source. Opus is a lossy codec, and the compression it applied when the audio was originally encoded can't be undone. What you gain from the FLAC conversion is editability, archivability, and compatibility with hardware and software that refuses Opus input. For anyone processing Discord voice messages or WebRTC recordings in a DAW, this conversion is the essential first step.

Quality & file size: OPUS to FLAC

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

FLAC will not restore detail the OPUS encoder removed, and the file gets bigger.

Frequently asked questions

Does converting Opus to FLAC improve audio quality?
No — the lossy Opus encoding is baked into the source. FLAC stores the decoded audio without further loss, enabling compatibility with lossless-only players, but cannot undo Opus compression.
Which hi-fi devices don't support Opus?
Many audiophile network streamers, CD transports with USB input, and older NAS music servers only support FLAC and WAV as local formats. Opus is a streaming codec and is not yet widely implemented in hi-fi hardware.

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