Convert OPUS to FLAC online
Free, no sign-up, no limits. Drop your OPUS files, get FLAC files back in seconds.
1 files converted so far
Drop your OPUS files here
or · multiple files accepted
Local conversion: your files never leave your device.
Why convert OPUS to FLAC?
You received a WhatsApp, Telegram or Discord voice message (.opus/.ogg) and it will not open on your computer, car stereo or editing software. FLAC solves the problem.
How to do it, step by step
- Drop your OPUS fileinto the area at the top of the page (or several files at once). On mobile, tap the area and pick the file from your apps.
- Check the output format: FLAC is already selected. FLAC is a lossless format: there is no quality setting, the sound is reproduced identically. The file will be noticeably larger than a compressed format.
- Start the conversion.The FFmpeg engine loads once (≈ 10 MB), then each file is processed in a few seconds without leaving your device.
- Download your FLAC, directly or as a .zip if you converted several files. The name and metadata (title, artist, cover art) are preserved.
The OPUS format (Opus Interactive Audio Codec)
Opus is currently the most efficient audio codec: it delivers the best possible quality at very low bitrates. It is the format of WhatsApp, Telegram and Discord voice messages and of video calls. Excellent, but still poorly recognized by consumer players and car stereos.
- Exceptional quality at low bitrates
- Free format
- The standard for voice on the internet
- Very few devices play it
- Often impossible to open on Windows without extra software
The FLAC format (Free Lossless Audio Codec)
FLAC compresses audio with zero loss: the file is 40 to 60% the size of the original WAV but reproduces exactly the same sound. It is the format of choice for audiophiles and music archives. It is free, open, and supports metadata and cover art.
- Quality identical to the original
- Free and open format
- Supports tags and cover art
- Files 5 to 10 times larger than an MP3
- Not played by Apple devices without a third-party app
OPUS vs FLAC comparison
| OPUS | FLAC | |
|---|---|---|
| Compression | Lossy | Lossless |
| Typical size (1 min, music) | ≈ 0.7 MB | ≈ 5 MB |
| Common use | WhatsApp/Telegram voice messages, Discord, calls | CD archiving, audiophiles, Bandcamp, Qobuz |
| Metadata (title, cover art) | Yes | Yes |
Frequently asked questions
Does converting OPUS to FLAC lose quality?
No: FLAC is a lossless format. The sound of the converted file is strictly identical to that of the original OPUS, but the quality already lost during OPUS compression is not recovered.
Is the OPUS to FLAC converter free?
Yes, with no limit on the number of files, no sign-up and no watermark. Each file can be up to 200 MB.
Are my OPUS files uploaded to the internet?
No. The OPUS to FLAC conversion is performed by FFmpeg directly in your browser (WebAssembly). Your files never leave your computer or phone.
How do I convert OPUS to FLAC on iPhone or Android?
Open this page in Safari or Chrome, tap the drop area, select your OPUS file (from Files, Voice Memos, Downloads or WhatsApp), then tap "Convert". The FLAC downloads to your files.
Can I convert several OPUS files at once?
Yes, add all your files in one go. They are converted one after another and a button lets you download everything as a .zip archive.