BR extension
designates a pure
data compression format not
providing file archival nor encryption features.
Brotli compression
algorithm was developed by Google continuing and superseding
previous Zopfli project
(which was meant for compatibility with standard zlib GZip /
Deflate specifications) in order to provide a more flexible compression
algorithm, capable both of high speed at low compression settings, and
improved (better than Deflate) compression ratio at higher compression
settings.
Extraction of Brotli-compressed files is also extremely fast.
For its extreme data compression and decompression speed, and low CPU
and memory usage (if compared to Deflate, or more powerful compression
algorithms such as BZip2, LZMA, PPMd, PAQ) Brotli is a competitor of
Facebook's Zstandard
compression algorithm.
Brotli-compressed
files are usually identified by .br extension, and can
contain a single input file; to overcome this by-design limitation
PeaZip automatically cascades Brotli compression with TAR archive creation if
multiple files or folders are sent as input for BR file creation,
resulting in a .tar.br archive.
In this two step process, input files are consolideted in a single TAR
archive (very fast, as no compression is involved), which is then
compresed by Brotly in the second step. On a related note, this
procedure improves compression ratio over compressing each input file
separately, read more about this topic on solid compression page.
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When is Brotli
compression
recommended
Google Brotli compression should be considered as viable alternative to
Zopfli and Deflate (Gzip, ZIP) when maximum compression / extraction
speed and efficiency is desired.
Both Brotli and its competitor Facebook's Zstandard outperforms classic
zlib / Deflate in fast, near real time data compression and
decompression.
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Read more about
.br file type on Google Brotli
official repository , and Brotli
algorithm entry on
Wikipedia.
PeaZip features creation and
extraction of BR files, can read (open, test and
extract) and write (compress to) BR file type relying on official
Google's Brotli implementations for Windows and Linux systems.
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.BR
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Authors
Jyrki Alakuijala, Zoltán Szabadka (Google), 2013
limited to 1 single file as input
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SPEED 
Brotli excels in fast compression and clearly outperforms classic
Deflate providing comparable compression levels.
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COMPRESSION
RATIO 
Brotli algorithm provides flexible compression, with good compression
ratio (improved over Deflate) at higher compression settings.
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ADVANCED
OPTIONS 
BR format is meant only for data streams or single-file compression,
lacks
archiving and encryption features by design.
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Synopsis: What is BR
file format extension. Google's Brotli data compression algorithm speed
and compression ratio. What are Brotli compressed files features and
specifications.
Topics: BR file
extension specs
PeaZip > FAQ
> What is BR format (Brotli compressed files)
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