The FLAC file format associated with the .flac filename extension refers to the FLAC audio encoding algorithm. FLAC is the acronym for Free Lossless Audio Codec. The algorithm is from the lossless audio compression family of formats for digital audio compression. It was developed by the Xiph.Org foundation, a non-profit organization that produces open and free to use multimedia formats, and had its initial release in 2001. Though there isn't widespread compatibility for the format as compared to similar formats such as MP3, the FLAC format enjoys some compatibility and support with in car and home stereo manufacturers as well audio playback software and portable audio devices.
Opus is a versatile audio codec optimized for both speech and music. It offers excellent quality at low bitrates.
FreeFileConvert uses tuned encoding for FLAC to OPUS conversions, preserving clarity while trimming file size. Finished audio streams instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload FLAC files from desktop, tablet, or cloud storage, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized OPUS results on any device you rely on.
Process up to 5 files sized 1000 MB per batch without splitting queues manually. Mixed-format uploads convert together, producing consistent OPUS audio with dependable progress tracking.
The FLAC compression algorithm has a claimed compression effectiveness of between 50 and 60%, and is able decompress audio streams to a bit for bit identical facsimile of the original. The FLAC format supports metadata tagging including other features such as seeking, album or cover art. Decoding information is stored in each FLAC frame, this makes the format particularly suited to streaming over computer networks.
Opus uses a hybrid approach combining SILK and CELT codecs. It supports bitrates from 6 kbps to 510 kbps.
Upload your audio file in the FLAC format from your device, Dropbox, or Google Drive.
Select OPUS as the output format and click Convert. Adjust optional settings if needed.
Download the converted audio file. Each file stays available for up to 5 downloads.