24 free tools

Check your site. Prepare a fix — no account needed.

Check a public URL for performance, SEO or accessibility issues. Use browser-based tools to convert images and fonts or generate code.

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Quick test

Run a quick test for a public URL.

Enter a public URL. See response time, page weight and basic quality signals.

Public URL

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A first look at one page

A performance and HTTP response check for a public URL. For a full SEO, accessibility and security audit, open Insight.

PerformanceHTTP1 URL

Find the right tool for your task

All: 24 of 24 tools

Check a site 12

Performance auditor PageSpeed Insights or technical HTTP checks. URL → Score Public URL analysis

Contrast checker WCAG 2.2 contrast check + harmonic palette. Colors → WCAG Runs locally Deutsch

Accessibility checklist 30 pre-launch WCAG 2.2 questions. Site → Checklist Runs locally

Responsive test Preview in 19 popular viewports. URL → 19 viewports Public URL analysis

Hreflang generator & checker Generate a set or check yours: syntax, self reference and x-default, locally in the browser. Tags → Validation Runs locally

Robots.txt tester Check whether a URL is blocked for a given crawler. robots.txt → Verdict Runs locally

Alt text checker alt attributes at a URL or in HTML, with anti-patterns. HTML → alt review Public URL analysis

Open Graph checker og: and twitter: tags as a crawler sees them. Public URL analysis

Redirect checker The 301/302 redirect chain for up to 10 URLs at once. Public URL analysis

AI visibility checker Can AI crawlers read a page: robots.txt, text without JS, directives and schema. Public URL analysis

Security headers checker HSTS, CSP, X-Frame-Options and the rest at a URL, each with a status. Public URL analysis

Canonical checker rel="canonical" and what the target page returns. Public URL analysis

Optimize assets 3

WebP / AVIF converter Batch conversion — the file never leaves your device. JPG · PNG → AVIF File stays on your device

Font converter TTF → WOFF2 with character subsetting. TTF → WOFF2 File stays on your device Deutsch

Favicon generator A favicon PNG set from a single PNG or SVG. PNG → ICO set File stays on your device

Prepare code 9

Code minifier HTML, CSS, JS, SVG — locally in the browser. Code → Minified Runs locally Deutsch

JS obfuscator Makes code harder to read — does not protect secrets or credentials. JS → Obfuscated Runs locally

Sitemap generator A URL list into a valid sitemap.xml, with validation. URL list → sitemap.xml Runs locally

Meta tag generator Title, description, Open Graph and Twitter Card. Fields → <head> block Runs locally

Redirect generator A URL map into .htaccess or nginx rules, with validation. URL map → Rules Runs locally

CSP generator Content-Security-Policy with a review of weak spots. Directives → CSP header Runs locally

OG image generator A 1200 × 630 Open Graph image with title and logo, PNG or JPG. Runs locally

llms.txt generator An llms.txt file from your sitemap, titles and descriptions. Public URL analysis

Schema markup generator JSON-LD for 8 types with the fields Google requires. Runs locally

Full Insight audit

One tool shows one signal.
Insight builds the full fix plan.

Combine performance, SEO, accessibility, security and CO₂e in one audit with clear fix priorities.

Open Insight in the app View a sample report

No credit card Report with date and sources Free account in the app