This template is used on 58,00,000+ pages, or roughly 3104% of all pages. To avoid major disruption and server load, any changes should be tested in the template's /sandbox or /testcases subpages, or in your own user subpage. The tested changes can be added to this page in a single edit. Consider discussing changes on the talk page before implementing them.
Within articles, this template is meant to be placed at the bottom of the article in the See also section. If there is no See also section, you can put it in the External links section instead; there is no need to create a new section just to house this template. If there is no External links section either, just put it below the article text in the place that seems most appropriate.
There are no particular rules about the placement of portals on other kinds of page.
Image
The portal image names are stored in subpages of Module:Portal/images, organised by the first letter of the portal name. For example, the first letter of Portal:Fishing is "F", so the image name is stored at Module:Portal/images/f. If there is an entry for a portal on the correct page then the corresponding image will be shown next to the portal link. If no image is found then File:Portal-puzzle.svg will be shown instead.
It is also possible to specify aliases for portal images. For example, the code {{portal|Detroit}} produces the same image as the code {{portal|Metro Detroit}}. The "Detroit" alias is found on the page Module:Portal/images/aliases.
The image-detection algorithm is case-insensitive. For example, the code {{portal|Detroit}} will produce the same image as the code {{portal|detroit}} (although the portal links will be different). Portal names are stored in lower case in the image subpages, and input is converted to lower case before being checked.
To add new images to the list, please make a protected edit request at Template talk:Portal to get an administrator to edit the correct subpage for you. Portal images must be either in the public domain or available under a free license that allows commercial reuse and derivative works; fair-use images are not acceptable. The template {{Portal icon demonstration}} may be of use when deciding whether an image is suitable for use as a portal icon; it formats an image using the same size and style that the {{portal}} template uses by default.
For adding aliases for existing portal names. Use this page for variations in spelling and diacritics, etc., no matter what letter the portal begins with.
Example
Code
Result
{{Portal|Science}}
Parameters
Name
Value
Description
1, 2, 3 ...
The portal name, e.g. Literature
The positional parameters specify the portals to be displayed.
left
yes
If set to yes, the portal appears on the left side of the page instead of the right.
margin
CSS margin value, e.g. 1.2em 3em 0.5em 1em
This allows you to set a custom margin. All valid CSS margin values are accepted.
break
yes
If set to yes, a line break is inserted after the portal name and before the word portal.
boxsize
Size in pixels, e.g. 300
This sets a custom box width in pixels.
Maintenance
The following tracking category lists instances where the template is used incorrectly:
{{Random portal component}}—Used on the portal main page to randomly display articles from the portal sub-pages.
{{Random portal component with nominate}}—Used on the portal main page to randomly display articles from the portal sub-pages, adding the option to nominate other Featured foo articles.
{{Random subpage}}—Used on the portal main page to randomly display articles from the portal sub-pages. This template is best used for creating randomly populated Did you know... sections on the portal main page that are intended to include multiple Did you know... facts.
{{Subpage}}—Used to output a box containing a link to subpage.
{{Numbered subpages}}—Used to create article links on portal sub-pages with 50 links.
