SEO HTML Analyzer
Paste your page HTML below for an instant SEO audit. Checks meta tags, heading structure, images, schema markup, keyword density, and more.
Total Issues0
Warnings0
Errors0
Passed0
Meta Tags
Heading Structure
Images
Schema Markup
Keyword Density
Links
Social & Technical
Issues
// Theme toggle
(function(){
const saved = localStorage.getItem('thund_theme');
if (saved === 'light') { document.documentElement.setAttribute('data-theme', 'light'); }
})();
function toggleTheme() {
const html = document.documentElement;
const current = html.getAttribute('data-theme');
const next = current === 'light' ? '' : 'light';
html.setAttribute('data-theme', next === '' ? '' : 'light');
localStorage.setItem('thund_theme', next || 'dark');
}
// Auto-save last result per page
(function(){
try {
const key = 'thund_result_' + window.location.pathname.split('/').pop().replace('.html','');
const saved = localStorage.getItem(key);
if (saved) {
// Look for a result div and restore
const resultDivs = document.querySelectorAll('[id$="Result"], [id$="result"]');
resultDivs.forEach(el => {
if (el.tagName === 'DIV' && !el.querySelector('*')) {
el.innerHTML = saved;
}
});
}
} catch(e) {}
})();
function saveResult(html) {
try {
const key = 'thund_result_' + window.location.pathname.split('/').pop().replace('.html','');
localStorage.setItem(key, html);
} catch(e) {}
}