Convert Opus to FLAC
Convert Opus audio files to FLAC format directly in your browser. FLAC is the open lossless container — useful when an Opus voice note or Discord recording will be re-edited multiple times (each save would compound Opus artifacts). No upload needed.
Drag 'n' drop files here, or
click to select files
.opus
Drop your files and click Convert to get FLAC
//when_to_use
When to Convert Opus to FLAC
- Decoding WhatsApp Opus voice notes to FLAC before multi-pass editing in Audacity (avoiding compounded artifacts on every save)
- Converting Discord-recorded Opus dialogue to FLAC as the editing master in Reaper, Pro Tools, or Audition
- Archiving Telegram saved Opus messages as FLAC for long-term preservation in DAM systems
- Preparing Opus interview recordings as FLAC for Roon / Audirvana playback (which prioritize lossless)
- Decoding Opus field recordings to FLAC for forensic / legal workflows requiring bit-perfect masters from the moment of decode
//comparison
OPUS vs FLAC
| Property | OPUS | FLAC |
|---|---|---|
| Compression | Lossy (Opus VBR) | Lossless (FLAC level 5) |
| Typical size (3 min) | 1-3 MB | 10-20 MB |
| Re-edit generational loss | Compounds each save | None |
| Archival suitability | Lossy floor | Bit-perfect from decode point |
| Audiophile player priority | De-prioritized | Native, prioritized |
| Best for | VoIP, voice notes | Multi-pass editing, archival |
//how_it_works
How It Works
Drop your Opus files
Drag and drop or pick .opus files. First conversion loads FFmpeg WASM (~30MB).
FFmpeg decodes Opus
FFmpeg WASM extracts Opus packets from the OGG container and decodes to 16-bit PCM at 48 kHz.
FLAC encode (level 5)
PCM is re-encoded with FFmpeg's FLAC encoder at compression level 5 — lossless, with stream info and metadata block headers.
Download FLAC files
FLACs import into Roon, JRiver, Plex, Audirvana, Foobar2000, every modern audiophile and DAM library.
// under the hood
Opus is a Xiph.Org lossy codec running internally at 48 kHz. FLAC (Free Lossless Audio Codec) is the Xiph.Org open lossless format — typically 50-60% the size of uncompressed PCM with bit-perfect reconstruction. Our converter uses FFmpeg WASM to decode the OGG/Opus stream to 16-bit PCM at 48 kHz, then re-encode with FFmpeg's FLAC encoder at compression level 5.
//faq
Frequently Asked Questions
- Will FLAC restore quality lost by Opus?
- No. The detail discarded by the Opus encoder is permanently gone. The FLAC will be a bit-identical lossless copy of the Opus's decoded PCM — no better than the source. Use FLAC to stop further loss, not to recover what's missing.
- So when is Opus to FLAC actually useful?
- When you'll re-edit, splice, or process the audio multiple times. Each save back to a lossy format compounds artifacts. Decoding once to FLAC and editing in FLAC keeps the audio bit-identical through every save. It's also useful for archival masters of voice notes you want to preserve permanently.
- How much bigger is the FLAC?
- FLAC is lossless compressed — typically 50-60% of uncompressed PCM. From an Opus source the FLAC is roughly 10-20x larger. A 1 MB WhatsApp voice note becomes a 10-15 MB FLAC. If size is the priority, WAV is even larger but FLAC is the same audio at half the size.
- What FLAC compression level do you use?
- FFmpeg's FLAC encoder at compression level 5 — the FLAC default. 16-bit signed PCM at Opus's native 48 kHz, channel count preserved. Level 5 is the standard speed/size balance.
- Are my files uploaded?
- No. FFmpeg WebAssembly decodes Opus and encodes FLAC entirely inside your browser. Files never leave your device.
//related_converters
Related Converters
Similar conversions you might need.
Convert Opus to MP3
Convert Opus audio to MP3 for legacy device compatibility — car stereos, old MP3 players, and DJ software.
→Convert Opus to WAV
Convert Opus voice notes and audio to uncompressed WAV for transcription, editing, and forensic workflows.
→Convert Opus to OGG
Convert Opus audio to OGG Vorbis for game engines and players that don't speak Opus.
→Convert Opus to AAC
Convert Opus audio to AAC for Apple ecosystem playback — iPhone, iPad, Apple TV, CarPlay.
→Convert MP3 to FLAC
Convert MP3 audio files to FLAC lossless format for archival and DAW workflows.
→Convert WAV to FLAC
Convert uncompressed WAV audio to FLAC lossless compressed format.
→