About SlowCheck
Free tools for checking the speed, SEO, and technical health of individual web pages.
What SlowCheck is
SlowCheck is a free, single-page web checker. Paste a public URL and get a report on loading speed, on-page SEO, and important security configuration — with plain-English explanations and specific fixes. For one-job-at-a-time checks, browse the free tools directory (speed, SEO, security and AEO).
Who it is for
Website owners, developers, SEO professionals, freelancers, agencies, ecommerce teams, and bloggers who want a clear picture of one page without installing software or creating an account.
What it checks
- Speed — response time, page weight, images, CSS, JavaScript, fonts, third-party weight, and Core Web Vitals where available (including PageSpeed). 17 checks
- Security configuration — HTTPS, HSTS, common safety headers, cookies, mixed content, and related public configuration. 11 checks
- SEO — title, meta description, headings, canonical, robots, viewport, alt text, Open Graph, and practical page health checks. 16 checks
What it does not check
- Not a penetration test or vulnerability scanner.
- Not a full security audit — configuration checks only.
- Not a whole-site crawler — one page at a time.
- Not an AI ranking tool — we never guarantee Google rankings.
Why results are measurements, not guesses
Findings come from measured request data, PageSpeed where available, and deterministic rules over the page’s HTML and headers. If a number was not measured, we say so instead of inventing one. Security findings are limited to what public configuration can show — always verify critical issues with qualified professionals.
Privacy in one line
Public URLs you submit are processed for the scan; see the Privacy Policy and Terms of Use.