CONVERT FLAC → OPUS (FLAC to OPUS)
Fast, secure FLAC to OPUS conversion. No registration required.
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Automatic format identification and lossless transcoding across 201+ formats.
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HOW TO CONVERT FLAC → OPUS
Provide the audio file
Drag the FLAC onto the uploader. Files up to 25 MB run on the free tier without registration; paid plans go up to 2 GB.
ffmpeg handles the conversion
Our ffmpeg-based pipeline reads sample rate and channel layout, then writes a matching OPUS with ID3 tags intact.
Save the output
Click to download the OPUS. Batch uploads are bundled into a ZIP for single-click retrieval.
FLAC is the Free Lossless Audio Codec, offering 40–60% compression with zero quality loss. That is why users land on this page looking for a OPUS copy. A FLAC to OPUS transcode is mostly about compatibility, not fidelity. At sensible default bitrates you cannot tell the two apart by ear; what you get is a file that actually opens on the hardware or website you were aiming at. FFmpeg handles the heavy lifting and we stream the result straight back as a download. Keep in mind FLAC is the Free Lossless Audio Codec, offering 40–60% compression with zero quality loss. And remember that Opus is the modern low-latency royalty-free codec used in VoIP, streaming, and WebRTC.
Why convert FLAC to OPUS
Moving from FLAC to OPUS usually buys compatibility or a friendlier file size. For spoken-word content the difference is inaudible; for high-resolution music pick the highest bitrate the OPUS codec supports to avoid compounding compression.
FLAC vs OPUS — Technical specifications
Side-by-side comparison of the technical details.
FLAC
- MIME type
- audio/flac
- Extension
- .flac
- Standard
- Open-source reference implementation (Xiph.Org)
- Max bit depth
- 32 bits per sample
- Max sample rate
- 655 350 Hz
- Max channels
- 8
- MIME Type
- audio/flac
- Category
- Audio Files
- Full Name
- FLAC Audio
- Conversion Engine
- FFMPEG
OPUS
- MIME type
- audio/opus
- Extension
- .opus
- Standard
- RFC 6716 (2012)
- MIME Type
- audio/opus
- Category
- Audio Files
- Full Name
- Opus Audio
- Conversion Engine
- FFMPEG
- Extensions
- .opus, .ogg (container)
- Sample rates
- 8, 12, 16, 24, 48 kHz
- Latency
- 5-60 ms (configurable)
| Specification | FLAC | OPUS |
|---|---|---|
| MIME type | audio/flac | audio/opus |
| Extension | .flac | .opus |
| Standard | Open-source reference implementation (Xiph.Org) | RFC 6716 (2012) |
| Max bit depth | 32 bits per sample | — |
| Max sample rate | 655 350 Hz | — |
| Max channels | 8 | — |
| MIME Type | audio/flac | audio/opus |
| Category | Audio Files | Audio Files |
| Full Name | FLAC Audio | Opus Audio |
| Conversion Engine | FFMPEG | FFMPEG |
| Extensions | — | .opus, .ogg (container) |
| Sample rates | — | 8, 12, 16, 24, 48 kHz |
| Latency | — | 5-60 ms (configurable) |
FLAC vs OPUS — Strengths and limitations
What each format does best, and where it falls short.
FLAC Strengths
- Lossless — decoded audio is bit-exact identical to the source.
- 40-60% smaller than uncompressed WAV/AIFF.
- Free, patent-free, open-source reference implementation.
- Built-in error detection via MD5 checksums.
- Streaming-friendly — seek tables let you jump to any timestamp instantly.
Limitations
- File sizes still large compared to lossy codecs (5-10× bigger than AAC for same audio).
- Not suitable for low-bandwidth scenarios like streaming on mobile data.
- Older MP3 players and car stereos may not decode FLAC.
OPUS Strengths
- Best-in-class quality across the entire bitrate range.
- Royalty-free and patent-free.
- Ultra-low latency — suitable for live voice and music.
- Handles speech and music equally well — no need to switch codecs.
- Mandatory codec in WebRTC, so supported in every browser by design.
Limitations
- Very low hardware decoder adoption — software-only on most phones.
- Older platforms (legacy Windows apps, old cars) may not play .opus files.
- Container semantics confusing — Opus lives inside Ogg, WebM, or MP4.
Quality & Compatibility
Sample rate, channel layout and bit depth are preserved by default: a 44.1 kHz stereo FLAC becomes a 44.1 kHz stereo OPUS. Metadata — title, artist, album, cover art — travels where both formats support it. Protected DRM content cannot be converted legally and is rejected.
Tips for Best Results
- Check the podcast host specification before choosing bitrate — some mandate CBR 64 kbps, others accept VBR up to 192 kbps.
- Preserve ID3 tags by editing them before conversion; Mp3tag and MusicBrainz Picard handle round-tripping cleanly.
- If the FLAC is 24-bit studio audio, the OPUS at 16-bit is sufficient for listening; higher is wasted on consumer playback gear.
Frequently Asked Questions
Lossy-to-lossy conversions (most combinations) re-compress the audio, which technically introduces some loss. At a 192 kbps or higher target it is inaudible on normal equipment. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy transcodes are only as good as the target bitrate you choose.
For voice content (podcasts, audiobooks, lectures) 128 kbps is indistinguishable from higher bitrates. For music, 192-256 kbps covers most listening; 320 kbps is the ceiling for OPUS and the right choice for audio you plan to edit further. Above that, prefer a lossless target instead.
Yes. Title, artist, album, year and cover art travel from the FLAC container to the OPUS container automatically where both formats support them. If a tag field has no OPUS equivalent, it is dropped silently. Use any tag editor (Mp3tag, MusicBrainz Picard) to fine-tune afterwards.
FLAC Audio
Source formatFLAC is an open-source lossless audio codec that compresses audio to roughly 50-60% of its original size without any quality loss. It is the preferred format for audiophiles and music archival.
Opus Audio
Target formatOpus is a versatile, open-source audio codec optimized for both speech and music at very low bitrates. It is the standard for WebRTC voice calls and excels at real-time communication.
Going the other way? Convert OPUS back to FLAC with the same engine.
Common Use Cases
Share across platforms
Send OPUS files to anyone without worrying about whether they have the right software for FLAC.
Embed in documents
Drop OPUS output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
OPUS often produces smaller files than FLAC for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
FLAC vs OPUS — Typical file sizes
Approximate file sizes for common scenarios.
- 3-min song (CD quality) 20-30 MB
- Full album (10 tracks, CD) 250-400 MB
- 3-min song (hi-res 24-bit/96 kHz) 80-120 MB
- Voice call (24 kbps) 180 KB/min
- Podcast (48 kbps) 21 MB/hour
- Music (128 kbps) ~1 MB/min
Lossless 24-bit Hi-Res Audio or Full Discographies?
Converting pristine FLAC/ALAC collections while preserving 192kHz master dynamics without exhausting mobile bandwidth? Dedicated multi-threaded workstation converters handle entire folders instantly.
One-time payment with zero recurring commitment: convert files up to 1 GB, OCR, PDF/A, and .ZIP batches for 24 hours.
Full 7 days of unlimited conversions, up to 2 GB per file, 100% ad-free with zero subscription.
High-throughput enterprise pipeline for files up to 2,048 MB, 50-file batches, ISO PDF/A, and priority processing.
Lossless batch chain processing preserving full ID3v2 metadata tags and embedded artwork.
Multi-CPU discography conversion with AccurateRip CRC verification and DSP mastering.
Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
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Read guide →OGG Container: Vorbis and Opus Audio Explained
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