Convert Opus to FLAC
Ethical Tube's free Opus to FLAC converter turns Opus audio files into FLAC, lossless compressed audio. It runs entirely in your browser, so your audio files are never uploaded, and it's free with no sign-up or watermark.
Files are converted on your device and never uploaded.
- Price
- Free
- Uploads
- None, it runs on your device
- Sign-up
- Not needed
- Batch
- Unlimited files
- Output
- FLAC, lossless
- Install
- Nothing to install
How it works
How to convert Opus to FLAC
Add your Opus files
Drop Opus files onto the converter, click to choose them, or paste from the clipboard. Add as many as you like.
Check the settings
FLAC is already selected. There's nothing to adjust, because FLAC keeps the full quality of the source.
Download your FLAC audio files
Each file gets its own download button as soon as it's ready. Download all saves everything in one ZIP file.
The formats
Opus and FLAC at a glance
What is an Opus file?
Opus is a modern, open audio codec that sounds better than MP3 and AAC at low bitrates, which is why WhatsApp voice messages, Discord, and many video calls use it. An .opus file is an Ogg file with Opus audio inside. It opens in Chrome, Firefox, Edge, Android, WhatsApp, VLC, and foobar2000. Many Apple apps, older Windows players, and car stereos can't play it.
What is a FLAC file?
FLAC compresses audio without losing any quality, usually to about half the size of a WAV file. Music collectors and hi-res music stores use it because it keeps CD-quality or better audio bit for bit. It opens in Windows 10 and 11, Android, VLC, foobar2000, browsers, and most hi-fi players. On iPhone and Mac it plays in the Files app, QuickTime, and VLC, but the Music app can't import it.
Good to know
What changes when you convert Opus to FLAC
- FLAC is lossless, so no more quality is lost, but it can't restore what Opus compression removed, and the file gets bigger.
- The audio is saved as lossless FLAC.
- Copy-protected (DRM) files can't be converted.
- Very long videos can run out of memory, especially on phones.
FAQ
Questions, answered
Is this Opus to FLAC converter free?
Yes. It's completely free, with no sign-up, no watermark, and no limit on how many files you convert. It costs Ethical Tube nothing to run, because the conversion happens on your own device rather than on a server.
Are my files uploaded anywhere?
No. The conversion runs inside your browser with Mediabunny and your browser's WebCodecs video encoders, so your files never leave your device. Once the page has loaded, it even works offline.
Does converting Opus to FLAC lose quality?
No. FLAC is lossless, so nothing is lost in the conversion. It can't add back quality that the Opus compression removed, though.
Can I convert several Opus files at once?
Yes. Add as many as you like. They're converted one after another, and you can download each FLAC file as soon as it's ready or all of them in one ZIP file.
Does it work on iPhone, Android, Mac, and Windows?
Yes. It works in current versions of Chrome, Edge, Safari, and Firefox. Phones handle short clips well, and long or 4K videos convert best on a computer.
What can open a FLAC file?
Windows 10 and 11, Android, VLC, foobar2000, browsers, and most hi-fi players. On iPhone and Mac it plays in the Files app, QuickTime, and VLC, but the Music app can't import it.
Is there a file size limit?
There's no upload limit because nothing is uploaded. The practical limit is your device's memory: everyday files are fine, and a computer can usually handle recordings several hours long.
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