Best prefill plugins for WordPress
The most popular prefill plugins for WordPress in November 2026, in WordPress.org’s own popular order, which follows active installs. Letter Template leads with 10+ active installs, ahead of Genius Marketo Form Prefill (API-Free) (fewer than 10). All 2 plugins tagged “prefill” 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.
Research this niche or see all plugins.
Top 2 prefill plugins
- 1.
Letter TemplateThe most installed prefill plugin, with 10+ active installs. Only 3 reviews so far, last updated 10 years ago. Tested only up to WordPress 4.3.34.
- 2.
Genius Marketo Form Prefill (API-Free)Fewer than 10 active installs. No reviews yet, last updated 7 years ago. Tested only up to WordPress 5.0.31.
All 2 plugins tagged “prefill”
Letter Template
Up in the last 7 days:2,613#37,582by nobug11 years ago
Allows visitors to populate business letter template providing their custom attributes via form.
- Installs
- 10+
- Rating
- 4.7(3)
- Downloads
- 1/day
Genius Marketo Form Prefill (API-Free)
#70,463by Yanir Calisar7 years ago
Automatically prefill your website forms with Marketo lead data
- Installs
- <10
- Rating
- –
- Downloads
- 0/day