Convert Opus to FLAC
Convert Opus to FLAC right in your browser — free, private, nothing is uploaded. Get a lossless file any editor opens — no further quality loss.
Convert Opus to FLAC →Free · Private — runs in your browser, nothing is uploaded
Opus delivers the best quality per bit of any mainstream codec — it beats MP3, Vorbis and AAC at almost every bitrate and powers WhatsApp voice notes, Discord and WebRTC. Device support, though, is still patchy outside browsers and messengers.
FLAC compresses audio without losing anything — a perfect, bit-for-bit copy at a fraction of the WAV size, which makes it the default choice for archiving music.
Converting Opus to FLAC is about compatibility rather than quality: some editors, DAWs and pipelines simply insist on FLAC. You get a file they open natively — but the audio can never get better than the Opus you start from.
Opus vs FLAC
| Opus | FLAC | |
|---|---|---|
| Compression | lossy — some detail traded for size | lossless — nothing discarded |
| Codec / container | Opus audio in an Ogg container | Free Lossless Audio Codec |
| Typical file size | smallest — excellent quality even at low bitrates | medium — typically 50–70% of the equivalent WAV |
| Best for | voice notes, VoIP and low-bitrate streaming | archiving and lossless music libraries |
| Strength | best quality per bit of any mainstream codec | lossless and compressed — a perfect copy, smaller than WAV |
| Watch out for | patchy support on older devices, car stereos and Apple apps | much larger than lossy formats; some older hardware skips it |
| Compatibility | great in browsers and messengers; patchy on older hardware | wide in modern software; patchy on older hardware players |
How the conversion works
- Choose your Opus file (up to 10 MiB). The button above opens the converter with FLAC already selected as the target format.
- There is no bitrate to choose: FLAC is lossless, so the bitrate field is simply ignored.
- Run the conversion and download the result — the output keeps your filename with a .flac extension. Everything happens locally: the page runs ffmpeg compiled to WebAssembly, so your audio is never uploaded to a server.
What to expect
No quality is restored. FLAC preserves exactly what's in your Opus file — detail the Opus encoder already discarded is gone for good. Expect a much larger file with identical sound; convert because a tool needs FLAC, not to upgrade the audio.
Embedded album art is dropped along the way: cover images ride along as a video stream, which audio-only outputs like FLAC can't carry.
FAQ
Does converting Opus to FLAC improve the audio quality?
No. FLAC preserves exactly what's in the source — detail the Opus encoder already discarded is gone for good. Convert because a tool needs FLAC, not to upgrade the sound.
Why is the FLAC file so much larger than my Opus?
Opus stores heavily compressed audio; FLAC stores a losslessly-compressed copy of the decoded audio — so the same sound takes several times the space. That's normal, and the extra bytes don't add quality.
Is my Opus file uploaded when converting to FLAC?
No. The page downloads an ffmpeg WebAssembly build once, then converts your file locally in the browser tab — the audio never leaves your device. Input files up to 10 MiB are supported.