SEOninja is a free Chrome extension designed for on-page SEO analysis, enabling users to audit web pages effortlessly. With a focus on privacy, this tool runs entirely on the client side, ensuring that no data leaves the user's browser. It provides detailed insights into various aspects of a webpage, including titles, meta tags, headings, and links, all accessible with a single click. Key features include indexability checks, canonical and robots status, and thorough evaluations of images and structured data.

The extension offers a user-friendly interface, allowing users to list, search, and highlight headings directly on the page. It also facilitates the inspection of links, schema data, and Open Graph tags, with live previews for social media sharing. Additionally, SEOninja includes performance hints for CSS and JavaScript, helping users optimize their web pages efficiently. Ideal for SEO specialists, developers, and content editors, SEOninja provides fast and reliable on-page checks without requiring any sign-up.