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Paste HTML and see a tree of H1–H6 headings with warnings for skipped levels, multiple H1s, and missing H1.
This heading structure validator runs 100% in your browser. Nothing you paste, drop, or generate ever leaves your device - no analytics on your input, no uploads, no logs.
HTML5 allows them in sectioning, but for SEO one H1 per page is safer.
Same browser-only philosophy. Free, no signup, no upload.
Audit image alt text - length, missing, decorative - across an HTML block.
Check WCAG AA / AAA contrast ratio between text and background colors.
Generate complete meta tags - title, description, OG, Twitter, robots, canonical - with live SERP preview.
Build complete Open Graph tags for Facebook and LinkedIn share cards.
Build Twitter / X card tags with summary or summary_large_image preview.
Build an XML sitemap from a list of URLs with priority and change frequency.
We design and ship internal tooling, dashboards, and customer-facing utilities. Tell us what you need and we'll scope it.