Compress FLAC to Opus

Need smaller audio files? Converting FLAC to Opus dramatically reduces file size. A 50MB file becomes 5MB. Perfect for email, sharing, and storage.

FLACOpus

Drop your FLAC file here or click to browse

FLAC (.flac) · Max 20 MB

FLAC files are uncompressed and huge. Opus uses lossy compression to shrink them by 90% or more. The size reduction is significant for sharing, uploading, and storage.

For email attachments, 128-192kbps works well. For music sharing, use 256-320kbps. AudioUtils lets you drop your file and convert instantly. No upload to a server, no waiting.

Expect roughly 10× smaller: FLAC runs about 5 MB per minute, Opus about 0.5. Because FLAC is lossless, this is the ideal encode: the encoder sees the complete original signal, so the Opus is the cleanest that audio can produce.

FLAC is the format of CD rips. It plays where it was made, but FLAC is lossless but poorly supported outside audiophile software — Apple's Music app won't touch it. Opus is the destination because it plays essentially everywhere — Discord recordings and every ordinary phone, browser, and player. Storage-wise you're looking at about 10× less: 5 MB per minute becomes roughly 0.5. Because FLAC is lossless, encoding to Opus here is the clean, single-generation case — the encoder sees the whole original signal, so this Opus is as good as the format gets.

Frequently Asked Questions

How much smaller will the file get?

Expect roughly 10× smaller: FLAC runs about 5 MB per minute, Opus about 0.5.

What bitrate keeps the quality acceptable?

192–256 kbps is transparent for most music, 128 kbps is fine for speech, and 64–96 kbps mono is plenty for pure voice — halving the size again with no real cost. Below that you start hearing it.

Will compressing damage the audio?

Because FLAC is lossless, this is the ideal encode: the encoder sees the complete original signal, so the Opus is the cleanest that audio can produce.

Should I compress a master or an archive copy?

Never the master. Compress a copy for sharing and listening, and keep the original — you can always re-encode from it, but you can never re-create what a lossy encoder discarded.

Is this compressor free?

Yes. Free users get 5 conversions per month. The output is limited to the first 10 seconds as a preview, with a 20MB input file size limit. Upgrade to Pro for unlimited, full-length conversions.