Free Online Security Tools: Browser-Based Utilities With No Account Required
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CyberSanso Free Security Utilities
The free tools on this page are browser-based security utilities built and maintained by the CyberSanso security team. No account required. No data stored after the session ends. No email capture before you can use them.
Password Strength Checker: Tests the strength of a password against common weakness patterns including dictionary words, keyboard walks, common substitutions, and known breach lists. Returns a strength score, estimated crack time at different attack speeds, and specific feedback on what is making the password weak. No password is transmitted to CyberSanso servers: all analysis runs in your browser using local JavaScript.
HTTP Security Header Scanner: Checks any public URL for the presence and correct configuration of HTTP security headers: Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Strict-Transport-Security, Referrer-Policy, and Permissions-Policy. Returns a score, the current header values, and specific recommendations for headers that are missing or misconfigured. Used by developers, security teams, and site owners to identify quick-win security improvements.
SSL/TLS Certificate Checker: Inspects the SSL/TLS certificate for any public domain: certificate validity dates, issuing CA, certificate chain completeness, supported TLS versions, and cipher suite security. Flags certificates approaching expiry, weak cipher suites, and TLS versions below 1.2 that should be disabled.
All three tools process data locally in your browser where possible. Where a network request is required (as in the SSL checker), only the domain name is transmitted to the CyberSanso API endpoint. No IP addresses, user identifiers, or session data are retained after the tool completes.
Trusted Free External Security Tools
Have I Been Pwned (haveibeenpwned.com): The most widely used tool for checking whether an email address or password has appeared in a known data breach. Built and maintained by security researcher Troy Hunt. Covers billions of records from thousands of data breaches. The password check uses a k-anonymity model that does not transmit your full password to the service. Essential first check for anyone concerned about credential exposure.
VirusTotal (virustotal.com): Scans files, URLs, IP addresses, and domains against over 70 antivirus engines and security tools simultaneously. Used by security researchers, incident responders, and IT teams to quickly assess whether a file or URL is known malicious. Files submitted to VirusTotal are shared with security vendors: do not submit sensitive or confidential files.
Shodan (shodan.io): A search engine for internet-connected devices. Used by security researchers to discover exposed services, misconfigured systems, and internet-facing infrastructure. Free tier provides limited searches per month. Used defensively by organisations to see what their own internet-exposed services look like to an external researcher.
SSL Labs Server Test (ssllabs.com/ssltest): Qualys SSL Labs provides the most detailed free SSL/TLS configuration assessment available. Tests cipher suites, protocol versions, certificate chain, and advanced TLS configuration including HSTS preloading, certificate transparency, and OCSP stapling. Returns a grade from A+ to F with detailed remediation guidance.
MXToolbox (mxtoolbox.com): Email security and DNS diagnostic tools covering SPF, DKIM, and DMARC record validation, blacklist checking, and MX record lookup. Used by IT administrators and email security teams to diagnose deliverability problems and validate email authentication configuration.
- Password strength checker: no server transmission, runs locally in browser
- HTTP security header scanner: Content-Security-Policy, HSTS, X-Frame-Options
- SSL/TLS certificate checker: expiry, cipher suites, TLS version support
- Have I Been Pwned: email and password breach checking, k-anonymity model
- VirusTotal: multi-engine file and URL scanning, 70 plus security tools
- Shodan: internet-connected device search for defensive reconnaissance
- SSL Labs: detailed TLS configuration grading from A+ to F
- MXToolbox: SPF, DKIM, DMARC validation and email security diagnostics
How to Use Free Security Tools Effectively
Use password tools for education, not storage: Password strength checkers are useful for understanding what makes a password strong or weak. They are not a substitute for a password manager. Never enter passwords you actively use into any online checker, including trusted ones: the best practice is to use a password manager (Bitwarden is free and open source) that generates and stores strong unique passwords for every account rather than manually crafting and testing passwords.
Run the HTTP security header scanner on your own sites: If you own or manage websites, running the HTTP security header scanner identifies security improvements that can typically be implemented in under an hour. A missing Content-Security-Policy header, a missing HSTS header, or an X-Frame-Options header allowing clickjacking are all quick fixes that meaningfully reduce the attack surface of a web application.
Use VirusTotal carefully: Files submitted to VirusTotal are shared with security vendors and may be retained. Do not submit files that contain sensitive data, internal documents, or proprietary code. VirusTotal is appropriate for checking files from unknown sources, suspicious email attachments, and downloaded software. For incident response purposes where files may contain forensic evidence, use a local analysis environment (Cuckoo Sandbox, Any.run with a private session) rather than a public service.
Combine tools for a basic security assessment: A quick external security posture assessment of a website or organisation can be built from free tools: Check SSL Labs for TLS configuration, check the HTTP security header scanner for web security headers, check MXToolbox for email security (SPF, DKIM, DMARC), check Shodan for any unexpectedly exposed services, and check Have I Been Pwned for credential exposure on corporate email domains. This combination takes under 30 minutes and surfaces the most common external-facing security weaknesses.
Use a password strength checker that evaluates entropy - randomness - rather than just minimum length rules. High entropy means the password resists both dictionary attacks and brute-force attempts at realistic computing speeds. CyberSanso's free checker evaluates entropy, character mix, dictionary exposure, and common patterns without sending your password to any server.
Enter your domain in CyberSanso's free SSL certificate checker. It returns the expiry date, issuer, certificate chain status, and TLS version in use. If expiry is within 30 days, set up an automated renewal reminder - certificate expiry is one of the most common causes of avoidable production outages.
HTTP security headers are response headers that instruct browsers on how to handle your page securely. The essential ones are: Content-Security-Policy (prevents cross-site scripting), Strict-Transport-Security (forces HTTPS), X-Frame-Options (prevents clickjacking), X-Content-Type-Options (prevents MIME sniffing), and Referrer-Policy. Check your current status with CyberSanso's free header scanner - a missing CSP is one of the most common fixable gaps.
Use CyberSanso's free email security tools: the SPF checker queries your DNS and verifies the record format, the DKIM checker verifies the public key for a given selector, and the DMARC checker reads and explains your current policy. Start with SPF, confirm DKIM, then add a DMARC policy starting at 'none' to collect monitoring data before moving to 'quarantine' or 'reject'.
DMARC is a DNS policy that tells receiving mail servers what to do when an email from your domain fails SPF or DKIM authentication. The three policy options are: none (monitor only), quarantine (move to spam), and reject (block the message). Start with 'none' to collect data on legitimate vs illegitimate sending sources, then graduate to 'quarantine' and 'reject' as you gain confidence in your sending configuration. Use our free DMARC record generator to build the correct syntax.
Enter your email address in CyberSanso's free data breach checker. It checks against known publicly disclosed breach databases and returns any matches. If a breach match is found, prioritise changing the password for that account and any other account where the same password was reused - credential reuse is the primary way breach data from one site gets exploited on another.
Yes. CyberSanso's free tools process your checks without storing input data. For tools that require a network request - domain lookups, header checks, SSL checks - only the domain name or URL is sent to run the query and it isn't logged or retained. Password checking happens entirely in your browser with no server communication. No account is required, no advertising network tracks usage, and no session data persists between visits.
CyberSanso's free tool set covers the main checks: HTTP security header scanner, SSL certificate and TLS configuration checker, SPF/DKIM/DMARC email authentication verification, DNS lookup, URL and phishing link scanner, and a combined website security scanner. All are available at /saas-tools/free-tools/ with no login required.
Security headers instruct browsers to enforce policies that protect your visitors from common attacks. A missing Content-Security-Policy leaves your site open to cross-site scripting attacks that can inject malicious code into your pages. Missing Strict-Transport-Security allows downgrade attacks that strip HTTPS from connections. These are not theoretical risks - they're the mechanisms used in real attacks against real websites, and fixing them requires only adding the correct headers to your server configuration.
A randomly generated string of at least 16 characters using upper and lower case letters, numbers, and symbols, unique to that account and not used anywhere else. The only practical way to maintain truly unique, high-entropy passwords across all your accounts is a password manager - Bitwarden is free and open-source, 1Password is the leading commercial option, KeePass is the self-hosted alternative. Use our free password generator to create one immediately.