Website Builder Ad Injection: Which Free Plans Show Ads on Your Site
Direct answer: Wix, Weebly, and WordPress.com display builder-branded ads or watermarks on free-tier published sites, while Google Sites, Blogger, and GitHub Pages do not inject any ads by default.
Why Builders Inject Ads
Ad injection is a direct monetization strategy: builders that don't charge for the free tier upfront recover some revenue through ad placements, and use ad removal as a paid-upgrade incentive.
Which Platforms Are Ad-Free by Default
Google Sites, Blogger, and GitHub Pages do not insert third-party ads or watermarks into your published pages, since none of these rely on the same freemium ad-injection model.
What This Means for Your Own Monetization
If you plan to run your own ads (such as Google AdSense) on your site, a platform that doesn't already occupy ad space with its own branding gives you more control over placement and revenue.