Website Safety & Security Checker

Free, no signup. A practical security snapshot from public signals — useful for prioritizing fixes, never a penetration test.

Checks run from our server; we fetch the URL you enter and don't keep the results. This fetches a public page and security.txt. The optional Google Web Risk component is a blocklist advisory, not a live malware scan. No certificate-expiry claim is made. 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.

Feedback
Report a bug

Found something broken in Website Safety Checker? Let us know what happened — this goes straight to a private triage queue, not a public list.

What will be sent
 No tool inputs, uploads, pasted source, complete results, query parameters, or URL fragments are attached automatically. You can edit or remove the selected passage above. Browser and anti-abuse metadata is processed for spam prevention. 
Compare up to three URLs

Checks run sequentially and are not cached as a batch. Grades cover the same bounded public signals as the single check.

Sample report

Illustrative example — deterministic complete public-signal fixture

A

Safety snapshot: 100/100

HTTP 200 · TLS handshake succeeded.

  • Security headers: all scored header rules pass; COEP absence is informational only.
  • Mixed content: no HTTP subresources or insecure form actions in the supplied HTML.
  • security.txt: valid required fields found.
  • Web Risk: not configured, so no malware/blocklist verdict is claimed.

This perfect fixture is intentionally narrow: it demonstrates scoring and is not described as a secure real-world website.

How to use it

  1. Enter the exact public URL and choose Run safety check.
  2. Read the overall letter as a summary of the implemented checks, then inspect the security-header grade and every reason.
  3. Distinguish a configured Web Risk advisory from checks marked not configured or not evaluated.
  4. Validate and prioritize changes with the site's security owner; do not use this report as a penetration-test substitute.

What the results mean

  • A through F maps the numeric score into a summary band; it is not a risk certification.
  • Security header grade comes from explicit pass, warning, error, and informational header rules.
  • Issues to review lists every score reason plus security.txt and mixed-content evidence.
  • Not configured or not evaluated is unavailable evidence, never a clean Web Risk verdict.

How it works

The endpoint fetches the public page, selected response headers, security.txt, limited RDAP data, and an optional Google Web Risk advisory. Shared deterministic functions scan bounded raw HTML for insecure subresources and form actions and validate required security.txt fields; the browser grades the returned evidence and combines those bounded signals into a documented score.

Features

  • Security-header findings with exact remediation details.
  • Raw-HTML mixed-content and insecure-form checks.
  • security.txt validation and limited RDAP context.
  • Optional Google Web Risk advisory with unavailable states preserved.
  • Evidence-led score with explicit reasons.
  • Sequential comparison of up to three public URLs.

Limitations

This is not a penetration test, vulnerability scan, certificate inspector, privacy audit, or live malware analysis. It does not execute JavaScript or inspect every rendered resource, application route, dependency, account control, server port, or security practice. A high score only describes the fetched public signals.

Frequently asked questions

Does an A grade mean a website is safe?

No. It means the bounded public checks scored well. The tool does not test application vulnerabilities, authentication, server configuration, malware behavior, social engineering, or data handling.

What does a Google Web Risk result mean?

When configured, it checks whether Google Web Risk returns a matching blocklist advisory. No match is not a live malware scan or a guarantee that a page is harmless.

Why does security.txt affect the score?

A valid security.txt gives researchers a standard way to report vulnerabilities. It is a useful public trust and response-readiness signal, but it does not make the application itself secure.

Can this checker see an expired certificate?

No. It records whether the HTTPS connection completed, but the Worker interface does not expose certificate expiry, hostname coverage, chain, or cipher details.

What is mixed content?

Mixed content occurs when an HTTPS page references an HTTP subresource or posts a form to HTTP. Those patterns can weaken transport protection and are detected only when visible in the fetched source.

Feature requests for Website Safety 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.

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➕ Request a feature

New requests are reviewed before they appear here.

À propos de l’outil

Évaluez les signaux publics de sûreté d’une page : HTTPS, certificat TLS, contenu mixte, formulaires, en-têtes de sécurité et security.txt. Le score explique les preuves disponibles sans prétendre certifier l’absence de malware ou de risque.

Fonctionnalités

  • Notation déterministe des en-têtes, du HTTPS, du contenu mixte et des actions de formulaire.
  • Contrôle de security.txt et séparation explicite des preuves absentes ou non évaluées.
  • Fixture de rapport complète pour comprendre chaque bande de score de A à F.
  • Signaux Web Risk et de liste de blocage traités comme indisponibles lorsqu’aucun fournisseur n’est configuré.

Fonctionnement

Le service récupère les réponses publiques et le HTML fourni, puis applique des règles déterministes aux certificats, en-têtes, sous-ressources, formulaires et security.txt. Le navigateur agrège les preuves en une note et conserve les états non configurés ou non évalués comme indisponibles.

Limites

  • Les signaux publics ne constituent ni un audit de sécurité, ni une certification de risque, ni une analyse complète du contenu.
  • Une page peut changer après la récupération et des ressources chargées dynamiquement peuvent échapper à l’inspection statique.

Questions fréquentes

La note A garantit-elle qu’un site est sûr ?

Non. Elle résume uniquement les signaux publics couverts par les règles de l’outil et ne certifie ni l’application, ni le contenu, ni l’absence de malware.

Que signifie contenu mixte ?

Une page HTTPS charge une ressource HTTP ou envoie un formulaire vers une URL non sûre. Remplacez ces dépendances par HTTPS ou supprimez-les.

Pourquoi Web Risk est-il parfois non configuré ?

Aucun fournisseur de réputation n’est configuré dans l’environnement de vérification. L’outil affiche cette preuve indisponible au lieu de produire un verdict propre.

Le contrôle analyse-t-il tout le JavaScript ?

Non. Il inspecte les signaux publics fournis et les ressources visibles, mais ne remplace pas une analyse dynamique complète du comportement applicatif.