Ultimate Guide for GZip Compression

Using GZip Compression you can faster your website loading speed.Compression of your HTML and CSS files with gzip typically saves around fifty to seventy percent of the file size.This means that it takes less time to load your website/pages and less bandwidth is used over all.

GZip Compression

GZip Compressed

What is GZip Compression?

When your page is loading a call is made to your server to load the requested files.

Bigger the size of the file,longer the time it takes to load and appear on screen.

GZip compresses your files before sending them to browsers and it reduces the file size drastically and reduces the page loading time.
Enabling Gzip compression can help you to achieve up to 50 – 75% less bandwidth than servers without Gzip.

Why GZip Compression it Important?

This is important to reduce the page loading time.It help in increasing the Site Performance.

How to Enable GZip Compression?

For Apache

You will need to add the following lines to your .htaccess file:

<IfModule mod_deflate.c>
  # Compress HTML, CSS, JavaScript, Text, XML and fonts
  AddOutputFilterByType DEFLATE application/javascript
  AddOutputFilterByType DEFLATE application/rss+xml
  AddOutputFilterByType DEFLATE application/vnd.ms-fontobject
  AddOutputFilterByType DEFLATE application/x-font
  AddOutputFilterByType DEFLATE application/x-font-opentype
  AddOutputFilterByType DEFLATE application/x-font-otf
  AddOutputFilterByType DEFLATE application/x-font-truetype
  AddOutputFilterByType DEFLATE application/x-font-ttf
  AddOutputFilterByType DEFLATE application/x-javascript
  AddOutputFilterByType DEFLATE application/xhtml+xml
  AddOutputFilterByType DEFLATE application/xml
  AddOutputFilterByType DEFLATE font/opentype
  AddOutputFilterByType DEFLATE font/otf
  AddOutputFilterByType DEFLATE font/ttf
  AddOutputFilterByType DEFLATE image/svg+xml
  AddOutputFilterByType DEFLATE image/x-icon
  AddOutputFilterByType DEFLATE text/css
  AddOutputFilterByType DEFLATE text/html
  AddOutputFilterByType DEFLATE text/javascript
  AddOutputFilterByType DEFLATE text/plain
  AddOutputFilterByType DEFLATE text/xml

  # Remove browser bugs (only needed for really old browsers)
  BrowserMatch ^Mozilla/4 gzip-only-text/html
  BrowserMatch ^Mozilla/4\.0[678] no-gzip
  BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
  Header append Vary User-Agent

For Nginx

Add the following code yo your config file.

gzip on;
gzip_comp_level 2;
gzip_http_version 1.0;
gzip_proxied any;
gzip_min_length 1100;
gzip_buffers 16 8k;
gzip_types text/plain text/html text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript;

# Disable for IE < 6 because there are some known problems
gzip_disable "MSIE [1-6].(?!.*SV1)";

# Add a vary header for downstream proxies to avoid sending cached gzipped files to IE6
gzip_vary on;

Enable GZip Compression in IIS

If you don’t have access to the final IIS instance (shared hosting…) you can create a HttpModule that adds this code to every HttpApplication.Begin_Request event :

HttpContext context = HttpContext.Current;
context.Response.Filter = new GZipStream(context.Response.Filter, CompressionMode.Compress);
HttpContext.Current.Response.AppendHeader("Content-encoding", "gzip");
HttpContext.Current.Response.Cache.VaryByHeaders["Accept-encoding"] = true;


You can enable GZIP compression entirely in your Web.config file. This is particularly useful if you’re on shared hosting and can’t configure IIS directly, or you want your config to carry between all environments you target.

  <httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files">
    <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll"/>
      <add mimeType="text/*" enabled="true"/>
      <add mimeType="message/*" enabled="true"/>
      <add mimeType="application/javascript" enabled="true"/>
      <add mimeType="*/*" enabled="false"/>
      <add mimeType="text/*" enabled="true"/>
      <add mimeType="message/*" enabled="true"/>
      <add mimeType="application/javascript" enabled="true"/>
      <add mimeType="*/*" enabled="false"/>
  <urlCompression doStaticCompression="true" doDynamicCompression="true"/>


If You like this tutorial then please share this with your friends and others.

Shubham Kumar

Hey, I am Shubham and i love Blogging, Coding and exploring new things and obviously sharing my experience with you.

You may also like...

Leave a Reply

Your email address will not be published. Required fields are marked *