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 AIFF files.
Opus to AIFF Conversion FAQ
What does the OPUS to AIFF audio converter do?
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OPUS is already lossy, so converting to AIFF preserves the existing audio without further degradation, but it cannot recover detail lost in the original encode. AIFF 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 AIFF output.
Will the AIFF 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 AIFF versus ~1 MB per minute for high-bitrate OPUS.
Will the AIFF be larger than the OPUS?
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Yes — lossless containers store every byte. Expect the AIFF 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 AIFF 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 AIFF preserves exactly that — no more. The file gets several times larger and sounds identical. It is still the right move before editing, because AIFF will not add a second generation of artefacts when you export. AIFF is the studio interchange format on macOS, handles metadata better than plain WAV, and imports into Logic and Pro Tools instantly. Opus is almost never supported by standalone hardware — assume software playback only, and expect car stereos to ignore it.
What exactly is an AIFF 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 an AIFF 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 AIFF files can behave differently while looking identical from outside. AIFF stores uncompressed big-endian PCM — the Apple-side equivalent of WAV, with the same bit-for-bit fidelity.
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 AIFF still a sensible thing to convert to?
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For a personal library, yes; for anything you are handing to somebody else, think twice. AIFF is being quietly succeeded rather than switched off — everything that plays it today will carry on playing it — but new encoders and new devices increasingly default to its replacement, which does the same job at least as well. If the file only has to open on your own machines, it is fine. If it has to open on a device bought in five years, pick the newer one. AIFF is as large as WAV with worse support outside the Apple world, so it is a poor choice for distribution.
Is there a file-size limit when converting OPUS to AIFF?
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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 AIFF 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 AIFF 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 AIFF 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.
