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FLAC to OPUS converter

Convert FLAC to OPUS in your browser. No upload and no account: the file never leaves your device, so the only size limit is your device’s memory.

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Related conversions

Need it the other way round? Convert OPUS to FLAC

Other ways to convert FLAC

Convert other formats to OPUS

Read more about the FLAC format and the OPUS format, or see every audio tool and all audio conversions.

Should you convert FLAC to OPUS?

A good trade for listening and sharing: OPUS is a fraction of the size of FLAC, and at 192 kbps or more the difference is inaudible for most people. Keep the FLAC as your master if you’ll edit or convert again.

FLAC is lossless audio at roughly half the size of WAV; OPUS is the most efficient audio codec in common use, especially for speech. Use Opus for speech and streaming where small size matters more than compatibility.

FLAC and OPUS compared
Property FLAC OPUS
Compression Lossless Lossy
Typical quality lossless, 16 or 24-bit 24–128 kbps
Support Opens almost everywhere Has patchy support
Best for Archiving music and recordings without losing anything Voice notes, calls and streaming at low bitrates
Introduced 2001 2012

How to convert FLAC to OPUS

  1. 01

    Add your FLAC

    Drop your FLAC file onto the box, or click to choose it. It is read from your disk and stays there.

  2. 02

    Check the settings

    The output is already set to OPUS. Change the bitrate if you want to; the defaults suit most files.

  3. 03

    Save the OPUS

    Press convert and save the OPUS. Several files come back together as a ZIP.

What changes when FLAC becomes OPUS

From lossless to lossy

FLAC holds every sample; OPUS keeps what the ear notices and discards the rest. Pick the bitrate by use: 128 kbps for speech, 192 to 256 kbps for music.

Opus runs at 48 kHz

Opus always works at 48 kHz internally, so other sample rates are converted. It sounds excellent at low bitrates, especially for voice.

Expect a much smaller file

FLAC: About 5–7 MB a minute for music. OPUS: A minute of voice note is often under 200 KB. Shrinking the file is often the main reason to make this conversion.

This page is put together from our notes on each format, choosing only what is true of FLAC and OPUS, so every pairing states the same facts the same way. How these pages are made.

Why it doesn’t upload

Recordings are often private: interviews, voice notes, unreleased music. Your browser can decode and encode audio itself, so there is no reason to send it anywhere.

How to check for yourself

Worth knowing

  • About the FLAC. FLAC made from an MP3 is lossless only in name: it perfectly preserves an already lossy recording, at five times the size.
  • About the OPUS. WhatsApp voice notes exported from a phone are Opus files, sometimes named .ogg, which many players and transcription services refuse.
  • MP3, WAV, M4A, OGG, Opus and FLAC are converted by your browser directly. WMA, AMR, APE, AC3 and the other specialist formats use the FFmpeg engine, a one-time 31 MB download.

Questions

Does converting FLAC to OPUS lose quality?

OPUS is lossy, so a little is discarded, but at the default bitrate the difference is inaudible for nearly everyone.

Will an OPUS play in my car or on my phone?

OPUS has patchy support: browsers, Android and chat apps; many media players, editors and forms can’t open .opus files.

Read more about this

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