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I am running Debian and Apache/2.2.22 I have gzip enabled, and I would like to know, what is my compression level and how to change it. I know this can be achieved editing php.ini, but I would like to configure it in apache. How can it be done?

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4 Answers 4

Reset to default
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You can adjust the compression level by simply adding DeflateCompressionLevel.

DeflateCompressionLevel 9

This line of code can range from 1 to 9, 9 being the best compression method. By default 9 is used and there is rarely any reason to specify a compression level unless your CPU usage is high due to high website usage.

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Believe it or not but the documentation for mod_deflate has this information in it. In particular DeflateCompressionLevel directive is your friend. You can set the level between 1 (low) and 9 (high). It also says in the documentation that the default is zlib's default compression level.

The zlib documentation says that the default compression level is 6.

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  • Where do I add this DeflateCompressionLevel? I tried to add it to apache.conf and restart apache but didn't change anything.
    – Firze
    Jun 25, 2014 at 10:42
  • @Firze the documentation tells you all you need to know. I suggest that rather than having me read it for you, you educate yourself in it's usage.
    – user9517
    Jun 25, 2014 at 10:48
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With Iain's help I figured out there is mod_deflate and I have to add deflatecompressionlevel in /etc/apache2/mods-available/deflate.conf

After the change my deflate.conf looked like this:

<IfModule mod_deflate.c>
          # these are known to be safe with MSIE 6
          AddOutputFilterByType DEFLATE text/html text/plain text/xml

          # everything else may cause problems with MSIE 6
          AddOutputFilterByType DEFLATE text/css
          AddOutputFilterByType DEFLATE application/x-javascript application/javascript application$
          AddOutputFilterByType DEFLATE application/rss+xml
          DeflateCompressionLevel 9
</IfModule>
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As a complement to accepted answer you could also use apache's filesMatch directive to compress all responses rather than compressing them by type:

<filesMatch "\.*$">
    SetOutputFilter DEFLATE
</filesMatch>
DeflateCompressionLevel 7  # I prefer to use 7 for less CPU consumption on traffics
DeflateMemLevel 9
DeflateWindowSize 15
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