On-Page SEO Checker
Free, no signup. A concise five-item on-page memo first, with the full raw-HTML detector output available in Advanced.
General preserves the base report. A named profile adds its required-signal checks; unavailable schema guidance and pack weights stay visibly not evaluated.
Checks run from our server; we fetch the URL you enter and don't keep the results. Anonymous run-level outcome counters may be used for aggregate research; URLs, domains, IPs, and identifiers are never included, and no statistic is released below 100 runs.
Sample report
Illustrative example — deterministic raw-HTML findings, not a live site claim
For a 200 page with no title, one H1, a self-canonical, a missing meta description, and an image without alt text, the report would summarize:
2 errors · 1 warning · supporting passes and not-evaluated checks
How to use it
- Enter a public, crawlable page URL and choose Run report.
- Start on Simple: top 5 for the highest-priority memo.
- Open Advanced: all checks to see every supported detector, including passes and not-evaluated states.
- Verify important fixes in the rendered page and Search Console where appropriate.
+ saves the current site or page. Use ☆ beside any saved site, page, or list to favorite it. Recent check history appears below.
Create a named list
Target filled from your local choices.
Site passport Local context for this saved site
Local data
Saved targets, named lists, and recent check summaries remain only in this browser.
Changed page? Compare a selected Wayback capture with the current page.
Rate this tool
What the results mean
- Errors (red) are clear implementation defects or strong blockers supported by the response.
- Warnings (orange) are likely issues that need context before changing the page.
- Needs review (yellow) marks evidence that cannot support a pass or error verdict yet.
- Information (blue) records useful evidence without calling it a defect.
- Pass means that specific observable rule passed, not that the whole page is optimized.
- Not evaluated means no verdict was possible and never counts as a pass.
How it works
The server retrieves the public response because browser cross-origin rules prevent direct inspection. The page context normalizes the final URL, status, headers, and raw HTML, then a deterministic detector registry runs supported technical and on-page checks. The Simple memo prioritizes the same results; it does not use a separate opaque score.
Features
- Five-item prioritized memo plus complete detector output.
- Checks across metadata, headings, canonicals, directives, links, images, and supported markup.
- Hreflang cluster validation follows up to 500 declared URLs with at most six concurrent fetches.
- Evidence-based pass, warning, error, information, and not-evaluated states.
- Escaped output and no fabricated verdicts when evidence is unavailable.
Limitations
This checker does not render JavaScript, run Lighthouse, measure Core Web Vitals, assess accessibility, score writing quality, inspect backlinks, or predict rankings. Hreflang detail shown on the page and in coverage samples is bounded even when validation reaches the 500-URL ceiling. A fetch can also differ from Googlebot because it originates from this site's server infrastructure. Confirm rendered and index-level behavior with purpose-built tools.
Frequently asked questions
What does an on-page SEO checker analyze?
This checker analyzes signals available in the server-returned HTML and response metadata, including titles, descriptions, headings, canonicals, robots directives, links, images, and supported structured-data patterns.
Is a passing report a guarantee that the page will rank?
No. The report identifies observable implementation issues. Rankings also depend on relevance, content quality, competition, authority, internal linking, and signals this raw-HTML tool cannot measure.
Why does the report say not evaluated?
Not evaluated means the checker lacks the evidence or rendering capability needed for a responsible verdict. It is different from a pass and keeps unavailable checks from inflating the result.
Does the checker render JavaScript?
No. It analyzes the raw HTML response. Use a rendered-page tool when a JavaScript application changes metadata, headings, content, or links after load.
Which findings should I fix first?
Start with errors that can prevent crawling, indexing, or a useful search result, then address warnings that affect page meaning. The Simple tab prioritizes five findings using the same detector results shown in Advanced.
Feature requests for On Page Seo Checker
Upvote what you want most. New ideas can be submitted from the floating Feedback menu; requests appear here once approved, and the most-wanted rise to the top.
You won't be emailed about that request anymore.
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Informazioni sullo strumento
Esamina i segnali SEO on-page di una pagina, dai title e heading ai canonical, meta, link, dati strutturati e contenuto visibile.
Funzionalità
- Riepilogo di title, description, canonical, robots, heading e lingua.
- Controllo di link, immagini, dati strutturati e segnali di contenuto.
- Finding deterministici con evidenza della sorgente da rivedere.
- Input paste o URL con report locale e stato dei limiti dichiarato.
Come funziona
Incolla HTML o recupera una URL pubblica. Esegui il controllo, leggi prima il riepilogo dei segnali e poi verifica ogni finding con l’evidenza HTML associata.
Limitazioni
- La modalità URL legge HTML raw e non il DOM renderizzato: contenuti aggiunti da JavaScript possono mancare.
- I finding descrivono struttura e segnali osservati; non giudicano accuratezza, intento, qualità o ranking futuro.
Domande frequenti
Il checker garantisce un buon ranking?
No. Offre controlli strutturali e indicazioni da verificare; contenuto utile, intento e qualità restano valutazioni editoriali.
Analizza il testo renderizzato?
La modalità URL analizza la risposta HTML raw; incolla l’HTML renderizzato se l’app costruisce contenuti dopo il caricamento.
Un finding deterministico è una penalità?
No. È un segnale riproducibile da esaminare, non una previsione automatica di penalizzazione o ranking.