Convert FLAC to OPUS
Free, fast FLAC → OPUS. No watermarks, no sign-up.
How to convert FLAC to OPUS
1. Upload FLAC
Drop your FLAC file into the converter above.
2. Confirm OPUS
Output is already set to OPUS. Adjust only if you need to.
3. Download
Convert and download your OPUS file instantly.
Format Details
FLAC
FLAC (Free Lossless Audio Codec) is an open-source audio format that compresses audio without any loss of quality, allowing perfect bit-for-bit reconstruction of the original recording. It typically reduces file sizes by 40-60% compared to uncompressed WAV while remaining completely lossless. FLAC is the format of choice for audiophiles, music archivists, and mastering engineers who require studio-quality audio fidelity in a manageable file size.
audioOPUS
Opus is a totally open, royalty-free, highly versatile audio codec. Opus is unmatched for interactive speech and music transmission over the Internet, but is also intended for storage and streaming applications. It is standardized by the Internet Engineering Task Force (IETF) as RFC 6716 which incorporated technology from Skype's SILK codec and Xiph.Org's CELT codec.
audioConverting FLAC to OPUS: what actually changes
FLAC to OPUS is one of the conversions this site performs, but the two formats are not interchangeable containers. Here is what the file keeps, what it loses, and how to get a result you can use.
What .FLAC and .OPUS each hold
.FLAC is a audio format built for listening to or editing a recording, storing sample rate, channels and bitrate. .OPUS is a audio format built for listening to or editing a recording, storing sample rate, channels and bitrate. Converting between them is a decision about which of those two jobs the result needs to do.
What changes in the conversion
Both files belong to the audio category, so this is a like-for-like repackage: the same kind of content, stored in a different container. What changes is how .OPUS encodes sample rate, channels and bitrate — not what the file is about.
Quality and file size
.FLAC keeps every detail, but .OPUS uses lossy compression to stay small. The first conversion is where quality is decided — after that, re-saving the .OPUS again compresses it a second time. Keep your original file if you may need to re-export later.
When this conversion is the right one
Reach for .OPUS when the software, device or platform you are sending to expects it — the content is the same audio, only the packaging differs. The reverse direction works the same way, so you can always convert back from .OPUS to .FLAC using the same tool.
Tips for a clean FLAC to OPUS conversion
Start from the original file
Convert the .FLAC you started with, not an earlier .OPUS output. Every extra round trip costs quality and can accumulate formatting drift.
Check the real type, not the extension
Audio/flac becomes audio/opus. If a file was renamed rather than converted, it will fail to open — rename it back to its true extension before uploading and the conversion will recognise it.
Length decides the time
Conversion runs in real terms on duration: a few seconds of media finishes almost at once, while a full-length .FLAC takes noticeably longer. Upload once and let it finish rather than retrying.
Limits worth knowing
Uploads are capped per file (30 MB, or 100 MB for video) and processed temporarily — nothing is kept as a permanent copy. For huge audio files, split or compress the source first.
Frequently Asked Questions
How do I convert FLAC to OPUS?
Upload your FLAC file on Convertek, select OPUS as the output format, then click Convert. Your OPUS file will be ready to download instantly.
Is the FLAC to OPUS converter free?
Yes. Converting FLAC to OPUS on Convertek is completely free with no watermarks. Fair upload limits apply (typically 30 MB per file).
Is my file kept after conversion?
No. Files are processed temporarily and not stored permanently. Converted downloads are available only in your browser session.
What is the difference between FLAC and OPUS?
FLAC and OPUS are different file formats with distinct use cases. Converting between them lets you use your file in software or workflows that require the OPUS format.