Web log analysis software (also called a web log analyzer) is a kind of web analytics software that parses a server log file from a web server, and based on the values contained in the log file, derives indicators about when, how, and by whom a web server is visited. Reports are usually generated immediately, but data extracted from the log files can alternatively be stored in a database, allowing various reports to be generated on demand.

Features supported by log analysis packages may include "hit filters", which use pattern matching to examine selected log data.^{[citation needed]}

Common indicators

• Number of visits and number of unique visitors
• Visit duration and last visits
• Authenticated users, and last authenticated visits
• Days of week and rush hours
• Domains/countries of host's visitors.
• Hosts list
• Number of page views
• Most viewed, entry, and exit pages
• File types
• OS used
• Browsers used
• Robots used
• HTTP referrer
• Search engines, key phrases and keywords used to find the analyzed web site
• HTTP errors
• Some of the log analyzers also report on who is on the site, conversion tracking, visit time and page navigation.