What is a default quality of brotli command? #257

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claunia · 2026-01-29T20:40:57Z

claunia commented

2026-01-29 20:40:57 +00:00

Originally created by @stokito on GitHub (Oct 27, 2018).

Nor in brotli --help nor in man brotli is not mentioned what is a default compression quality.
It just said that quality can be in range of 0-9 but later it said that -q param can be in range 0-11.

$ brotli -h
Usage: brotli [OPTION]... [FILE]...
Options:
  -#                          compression level (0-9)
  -q NUM, --quality=NUM       compression level (0-11)
  -Z, --best                  use best compression level (11) (default)

What I see from sources in brotli.c in main method:

int main(int argc, char** argv) {
  Command command;
  Context context;
  context.quality = 11;

So it looks like the default quality is 11 i.e. best.

Could you mention this somewhere?
Can we set the maximum quality by -11 param?

Originally created by @stokito on GitHub (Oct 27, 2018). Nor in `brotli --help` nor in `man brotli` is not mentioned what is a default compression quality. It just said that quality can be in range of 0-9 but later it said that -q param can be in range 0-11. ``` $ brotli -h Usage: brotli [OPTION]... [FILE]... Options: -# compression level (0-9) -q NUM, --quality=NUM compression level (0-11) -Z, --best use best compression level (11) (default) ``` What I see from sources in [brotli.c](./c/tools/brotli.c) in `main` method: ```c int main(int argc, char** argv) { Command command; Context context; context.quality = 11; ``` So it looks like the default quality is 11 i.e. best. 1. Could you mention this somewhere? 2. Can we set the maximum quality by `-11` param?

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Reference: starred/brotli#257