# Plugins builtin

Configuration defaults (at built time):

DO:

  Default on

Table 1 Plugins configured at built time (defaults)
Name | DO | Description JS & CSS dependencies
--- | --- | ---
Basic Calculator | y | Calculate mathematical expressions via the search bar
Hash plugin | y | Converts strings to different hash digests.
Hostnames plugin |  | Rewrite hostnames, remove results or prioritize them based on the hostname
Open Access DOI rewrite |  | Avoid paywalls by redirecting to open-access versions of publications when available
Self Information | y | Displays your IP if the query is “ip” and your user agent if the query contains “user agent”.
Tor check plugin |  | This plugin checks if the address of the request is a Tor exit-node, and informs the user if it is; like check.torproject.org, but from SearXNG.
Tracker URL remover | y | Remove trackers arguments from the returned URL
Unit converter plugin | y | Convert between units