How to use the OnlineTextLab SEO checker suite to audit page titles, descriptions, headings structure, Open Graph tags, schema markup, robots directives, and canonical URLs.
Paste your page's HTML source into the Meta Title Checker or Meta Description Checker. Each tool extracts the relevant tag, measures the pixel width (titles) or character count (descriptions), and flags values that are too short, too long, or missing. The SERP Preview tool renders both together as they would appear in Google search results.
Paste HTML into the Headings Checker to get an ordered list of every H1–H6 tag with its text content. The tool flags missing H1s, multiple H1s on the same page, and heading hierarchy jumps (e.g., H2 directly following H4). A clean heading tree helps search engines understand page structure.
Open Graph Checker extracts all og: meta tags and shows the populated values for og:title, og:description, og:image, og:type, and og:url. Twitter Card Checker does the same for twitter: tags. Both tools render a social share preview so you can see how the page would appear when shared on social platforms.
Canonical URL Checker extracts the rel=canonical link tag and compares it with the URL you are auditing. Robots Meta Checker reads the content attribute of the robots meta tag and flags noindex, nofollow, and other directives that may be accidentally blocking crawlers.
