Step 1: Supply your Opus files using the button above or by haul and lay.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Get your converted FLAC files.
Opus to FLAC Conversion FAQ
What does the OPUS to FLAC audio converter do?
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OPUS is already lossy, so converting to FLAC preserves the existing audio without further degradation, but it cannot recover detail lost in the original encode. FLAC is right if you plan to edit and resave without compounding compression artifacts.
Will the sample rate and channel layout be preserved?
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By default yes — stereo stays stereo, the original sample rate (44.1 kHz, 48 kHz, etc.) is carried through to the FLAC output.
Will the FLAC file be much larger than the source OPUS?
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Yes — lossless audio is typically 5-10x larger than lossy audio at perceptually equivalent quality. Plan for ~10 MB per minute for FLAC versus ~1 MB per minute for high-bitrate OPUS.
Will the FLAC be larger than the OPUS?
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Yes — lossless containers store every byte. Expect the FLAC to be 3-8x the size of the OPUS. The benefit is no further quality loss on editing or re-encoding.
Does converting OPUS to FLAC improve the audio quality?
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No, and it is worth being blunt: nothing can. The OPUS already discarded detail during its original encode, and wrapping what remains in a lossless FLAC preserves exactly that — no more. The file gets several times larger and sounds identical. It is still the right move before editing, because FLAC will not add a second generation of artefacts when you export. FLAC gives you WAV fidelity at half the size, with proper metadata tags and embedded artwork, which is why it dominates lossless music libraries. Opus is almost never supported by standalone hardware — assume software playback only, and expect car stereos to ignore it.
What exactly is a FLAC file?
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A container with the audio inside it, rather than the audio on its own. That extra layer is where the length, the seek index and whatever metadata the format defines are kept, so a player knows how long a FLAC is before decoding a single frame instead of scanning the whole file to find out. It also means the extension does not always settle what is inside: several containers of this kind are allowed to hold more than one sort of audio, which is why two FLAC files can behave differently while looking identical from outside. FLAC uses linear prediction plus Rice coding to reach roughly 50-60% of the original size while decoding back to bit-identical PCM.
Where do OPUS files normally come from?
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From the web, and mostly from software rather than from hardware. OPUS was designed for streaming and for open-source tool chains, so it turns up in game assets, browser recordings, podcast pipelines and anything built by people who did not want a licensing conversation. What it does not turn up in is consumer electronics, which is the usual reason somebody needs to convert one at all. Opus is an IETF standard from 2012 that merged Skype’s SILK speech codec with Xiph’s CELT music codec into one design.
Is OPUS free to use and distribute?
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Yes, without conditions worth worrying about. The specification is public, anyone can implement an encoder or decoder without asking or paying, and nobody can change those terms later — which is why it turns up in open-source tooling, in game engines and anywhere a licence negotiation would have killed the project. Converting away from it does not undo that; the files you already have stay exactly as usable as they were.
Is there a file-size limit when converting OPUS to FLAC?
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Anonymous uploads are capped at a generous default; signed-in free accounts get a higher cap, and Pro accounts have no per-file limit. Browser memory is usually the practical constraint long before our server-side limits kick in.
Can I batch-convert several OPUS files to FLAC at once?
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Yes. Drop or pick multiple OPUS files in one upload — the converter processes them in parallel and returns a ZIP of the FLAC results. There is no need to repeat the upload step per file.
What happens to my OPUS files after the conversion?
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Uploaded files and FLAC outputs are auto-deleted after a short retention window. We do not inspect, share, or train on user files. Direct download links are time-limited and tied to your session.
What apps can play a FLAC file?
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FLAC plays in most music players, browsers, and media libraries. iTunes / Apple Music, VLC, Foobar2000, and phone media apps handle it natively.
