Free FLAC to OPUS converter

Why convert FLAC to OPUS?

People convert FLAC to OPUS because FLAC keeps every bit of the original, which makes the files several times larger than they need to be, while Opus beats every other codec at low bitrates, which is why calls and podcasts use it.

How to convert FLAC to OPUS

1. Choose your FLAC file. Drop it on the box above, or tap to browse. You can pick several files at once.
2. Confirm the target is .opus. It is preselected when your browser can encode it; otherwise the closest available target is chosen. Adjust quality, size or the other options if you want to.
3. Convert and download. Press Convert, then Download. Your file stays on your device the whole time.

What is a .flac file?

FLAC compresses audio to roughly half its size while preserving every original sample exactly. It is the format of choice for archiving a CD collection or distributing high-resolution music, at the cost of files several times larger than an MP3.

What is a .opus file?

Opus is the codec behind nearly all modern voice and music streaming, standardised by the IETF and free to use. It stays intelligible at bitrates where other codecs collapse, and every current browser decodes it.

What to expect from this conversion

The audio is decoded and re-encoded with the target codec. Choose 192 kbps or higher for music; speech is perfectly clear at less. Converting between two lossy formats always loses a little, so work from the original where you can. FLAC is lossless, so this is the best possible starting point for any conversion.

Is it private?

Yes, by design. Every conversion happens inside your own browser using your device’s processor — there is no server that receives your FLAC file, so there is nothing for anyone to store, scan or leak. You can confirm it yourself: open your browser’s developer tools, watch the Network tab while you convert, and you will see no upload.

Questions about FLAC to OPUS

Is this FLAC to OPUS converter free?

Yes, completely. There is no account, no daily limit, no watermark and no premium tier.

Is my FLAC file uploaded to a server?

No. The conversion runs inside your own browser using your device's processor. The file is read from your disk, converted in memory and saved back to your disk — nothing is transmitted, so there is nothing for anyone to store.

What happens to the quality?

The audio is decoded and re-encoded with the target codec. Choose 192 kbps or higher for music; speech is perfectly clear at less. Converting between two lossy formats always loses a little, so work from the original where you can. FLAC is lossless, so this is the best possible starting point for any conversion.

How do I convert FLAC to OPUS on Windows, Mac or Linux?

The same way on all three: open this page in Chrome, Edge, Firefox or Safari, drop the FLAC file, press Convert and download the OPUS. Nothing is installed and no admin permission is needed.

Can I convert FLAC to OPUS on an iPhone or Android phone?

Yes. Open this page in Safari or Chrome on the phone, pick the file from Photos or Files, tap Convert and save the result. The conversion runs on the phone itself, so it works on mobile data without uploading anything.

Can I batch convert several FLAC files to OPUS at once?

Yes. Select as many files as you like and they are converted one after another in a single tap, with a download for each and a zip of all of them.

Can I convert FLAC to OPUS without FFmpeg or a script?

Yes — that is what this page is for. FFmpeg does the same job well if you already have it set up and thousands of files to process; for one file, or a handful, the browser is faster than installing anything.

Should I keep the original FLAC file?

Yes — keep it, converting never touches it. The reason to make a copy in another format is that FLAC keeps every bit of the original, which makes the files several times larger than they need to be.

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