SEO Audit
On-page SEO audit with per-check fixes; deep scan adds Lighthouse + broken-link detection.
A free on-page SEO site checker. Enter a URL and Zapbox fetches the page server-side, parses the HTML, and checks the title & meta description (and their length), H1 & heading structure, canonical, meta robots, Open Graph & Twitter cards, JSON-LD structured data, image alt text, viewport, charset, lang, word count, internal/external links, HTTPS, and robots.txt / Sitemap — then gives a 0–100 score with a fix suggestion per check. Switch to Deep scan to additionally run Lighthouse (performance / accessibility / best-practices / SEO scores plus Core Web Vitals) and detect broken links on the page. Public URLs only.
How to use
- Paste the URL to check (https:// is optional).
- Click Scan — the server fetches and analyzes the page.
- Read the overall score and the per-check results grouped into Meta / Headings / Social / Structured data / Content / Technical.
- For items flagged warn or fail, apply the suggested fix.
FAQ
- Why fetch server-side instead of in the browser?
- Browsers cannot read another site’s HTML due to the same-origin policy (CORS). Fetching from the Zapbox server is the only way to get the full page to analyze; the page is used and discarded, not stored.
- Does it include performance (Lighthouse), broken links, or ranking?
- Basic scan focuses on the page’s on-page elements; Deep scan additionally runs Lighthouse (performance / accessibility / best-practices / SEO scores plus Core Web Vitals) and checks the page for broken links (~20–40s). SERP keyword ranking is still not included (it needs a paid data source).
- Can it scan internal or local addresses?
- No. For safety (SSRF protection), URLs that resolve to private, loopback or other non-public addresses are rejected.
Related tools
- Request Echo — See what the server actually received: every header, the real IP, the proxy chain.
- HTTP Testbed — Return any status, delay, redirect or payload size to exercise client retry and timeout logic.
- Webhook Box — Generate a temporary URL to capture third-party callbacks and inspect headers and body in full.
- IP Check — See every exit IP at once — mainland, international, Cloudflare edge and server-side viewpoints probed in parallel with an automatic split-routing verdict, cross-checked across five geo providers, plus WebRTC / timezone / IPv6 leak checks.
- Speed Test — Multi-threaded speed test: parallel connections measure download and upload throughput, HTTP round-trip latency and jitter, with each connection's contribution shown — a lagging stream usually means packet loss or a rate-limiting middlebox.
- Domain Check — Check domain availability.