Best add class plugins for WordPress
The most popular add class plugins for WordPress in November 2026, in WordPress.org’s own popular order, which follows active installs. Custom CSS classes for images leads with 100+ active installs, ahead of OS Adder (10+). All 2 plugins tagged “add class” are below, with figures from WordPress.org that update every day.
Installs aren’t everything: a recent release, a “Tested up to” that matches the current WordPress, and support threads that get resolved show a plugin is looked after. Open any plugin for its downloads, rank history and alternatives.
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Top 2 add class plugins
- 1.
Custom CSS classes for imagesThe most installed add class plugin, with 100+ active installs. Only 3 reviews so far, last updated 11 years ago. Tested only up to WordPress 4.2.39.
- 2.
OS Adder10+ active installs. No reviews yet, last updated 10 years ago. Tested only up to WordPress 4.3.34.
All 2 plugins tagged “add class”
Custom CSS classes for images
Up in the last 7 days:12#14,040by nivijah11 years ago
This simple plugin adds two additional fields to the media window, that lets you set additional classes to images on top of the default ones.
- Installs
- 100+
- Rating
- 5.0(3)
- Downloads
- 0/day
OS Adder
Down in the last 7 days:3,650#44,092by trauben-nuss11 years ago
Add the operating-system's abbreviation as a CSS-Class to the body-tag.
- Installs
- 10+
- Rating
- –
- Downloads
- 1/day