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OPUS to FLAC converter

Convert OPUS to FLAC 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 FLAC to OPUS

Other ways to convert OPUS

Convert other formats to FLAC

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

Should you convert OPUS to FLAC?

Only when software insists on FLAC. It stores the decoded OPUS perfectly, but the detail the OPUS discarded is already gone, so the FLAC is bigger without sounding better.

FLAC also plays in more places: most modern players, Android and recent iPhones; some car stereos and older apps don’t.

OPUS is the most efficient audio codec in common use, especially for speech; FLAC is lossless audio at roughly half the size of WAV. Use FLAC to archive music and recordings you may want to convert again later.

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

How to convert OPUS to FLAC

  1. 01

    Add your OPUS

    Drop your OPUS 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 FLAC. Change the bitrate if you want to; the defaults suit most files.

  3. 03

    Save the FLAC

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

What changes when OPUS becomes FLAC

Bigger, not better

FLAC can’t restore what OPUS compression removed. It does make editing easier and stops further loss, which is why editors and some broadcast systems ask for it.

Expect a much larger file

FLAC is far bigger for the same content. Choose it because something needs FLAC, not to send or store the file. OPUS: A minute of voice note is often under 200 KB. FLAC: About 5–7 MB a minute for music.

This page is put together from our notes on each format, choosing only what is true of OPUS and FLAC, 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 OPUS. WhatsApp voice notes exported from a phone are Opus files, sometimes named .ogg, which many players and transcription services refuse.
  • 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.
  • 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 OPUS to FLAC lose quality?

No quality is lost converting to FLAC, though it can’t restore what the OPUS already discarded.

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

FLAC opens almost everywhere: most modern players, Android and recent iPhones; some car stereos and older apps don’t.

Read more about this

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