Generate HTML meta tags for SEO, Open Graph, and Twitter Cards.
Create flowcharts, sequence diagrams, ER diagrams, Gantt charts and more with Mermaid syntax.
Generate random UUID v4 identifiers for your applications.
Test and debug regular expressions with real-time matching.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text.
<!-- Primary Meta Tags --> <title>My Website — Best Tools Online</title> <meta name="title" content="My Website — Best Tools Online"> <meta name="description" content="A short description of your website for search engines and social sharing."> <!-- Open Graph / Facebook --> <meta property="og:type" content="website"> <meta property="og:url" content="https://example.com"> <meta property="og:title" content="My Website — Best Tools Online"> <meta property="og:description" content="A short description of your website for search engines and social sharing."> <meta property="og:image" content="https://example.com/og-image.png"> <meta property="og:site_name" content="My Website"> <!-- Twitter --> <meta property="twitter:card" content="summary_large_image"> <meta property="twitter:url" content="https://example.com"> <meta property="twitter:title" content="My Website — Best Tools Online"> <meta property="twitter:description" content="A short description of your website for search engines and social sharing."> <meta property="twitter:image" content="https://example.com/og-image.png"> <meta property="twitter:site" content="@mywebsite">