OptimFROG (. Ofr ) is a codec Florin Ghido, which allows lossless audio data compression. The algorithms of OptimFROG are optimized for very high compression rates, albeit much slower encoding / decoding computation times than comparable programs must be taken into account.

OptimFROG Dual Stream ( .ofs / ofc ) allows lossy audio data compression and provides a hybrid mode is available in which a correction file is generated in addition to the lossy file, with the aid of which can be completely restore the source data.

When compressing the audio data MD5 hash can be incorporated, can be checked with the whether the data is compressed correctly. As tagging systems APEv2 and ID3v1.1 are supported. Support for ReplayGain is also available.