Best SSL/TLS Testing Tools — Free & Online (2026)
Zu den besten SSL/TLS-Testtools 2026 zählen ImmuniWeb SSL Security Test, Qualys SSL Labs, testssl.sh, SSL Checker und Hardenize. Sie prüfen die Gültigkeit von Zertifikaten, die Stärke von Protokollen und Ciphers sowie die Konfiguration anhand von Standards wie PCI DSS, HIPAA und NIST. Die richtige Wahl hängt davon ab, ob Sie eine schnelle, kostenlose Online-Bewertung, Kommandozeilen-Automatisierung oder compliancefokussierte Berichterstattung wünschen.
SSL/TLS testing tools inspect how a web or email server encrypts traffic: the validity and chain of its certificate, which protocol versions and cipher suites it allows, and whether its configuration follows current best practice. Weak protocols, expired certificates and insecure ciphers are common, easily exploited misconfigurations.
Most teams want two things from an SSL test: a clear grade they can act on, and a mapping to the compliance regimes they answer to — PCI DSS, HIPAA and NIST in particular. The tools below range from instant online graders to scriptable command-line scanners for CI/CD.
Best SSL/TLS testing tools at a glance
| Tool | Type | Key strength | Best for | Free option |
|---|---|---|---|---|
| ImmuniWeb SSL Security Test | Online + CLI | SSL für Web und E-Mail, PCI-/HIPAA-/NIST-Prüfungen | Compliance-fokussierte kostenlose Bewertung | Ja |
| Qualys SSL Labs | Online | Detailed grade & deep config analysis | Eingehende einmalige Webserveranalyse | Ja |
| testssl.sh | Open-source CLI | Skriptbar, offline, gründlich | Automation / air-gapped checks | Yes (OSS) |
| SSL-Checker | Online | Quick certificate/chain check | Fast certificate validation | Ja |
| Hardenize / Red Sift | Online | Holistic web & email config | Domänenweite Sicherheitslage | Limited |
Die verglichenen Tools
ImmuniWeb SSL Security Test
Best for: free, compliance-oriented SSL/TLS grading of web and email servers. It tests web and email server SSL/TLS, validates certificates and checks configuration against PCI DSS, HIPAA and NIST, returning a grade and a downloadable report. A CLI is available for CI/CD pipelines. It is a strong free entry point for teams that need compliance evidence, not just a grade.
Qualys SSL Labs
Best for: deep, one-off analysis of a public web server. Long the reference grader, SSL Labs gives an exhaustive breakdown of protocols, ciphers and known issues for a single host. It focuses on public web servers rather than email.
testssl.sh
Best for: automation and offline or air-gapped checks. A free, open-source command-line tool that runs thorough checks locally, ideal for pipelines and environments where you cannot send hostnames to a third party.
SSL Checker tools
Best for: fast certificate and chain validation. Numerous free online checkers quickly confirm a certificate is valid, correctly chained and not expiring. They are handy for spot checks but shallow on cipher and protocol depth.
Hardenize / Red Sift
Best for: domain-wide security posture including email. These tools assess SSL/TLS alongside broader web and email security configuration, giving a holistic view rather than a single-host grade.
Free online vs command-line SSL testing
Online-Grader wie ImmuniWeb’s SSL Security Test und Qualys SSL Labs sind der schnellste Weg, um eine handlungsorientierte Note für einen öffentlichen Host zu erhalten, und ImmuniWeb fügt explizite PCI DSS-, HIPAA- und NIST-Checks sowie E-Mail-Server-Tests hinzu.
For automation or sensitive environments, a command-line tool such as testssl.sh runs locally and slots into CI/CD, so you can fail a build on a weak configuration without sending data to a third party.
So wählen Sie ein SSL/TLS-Testtool aus
Passen Sie das Tool an das an, was Sie nachweisen müssen, und an Ihre Arbeitsweise:
- Coverage of both web servers and email servers (SMTP/IMAP TLS).
- Certificate validation: expiry, chain and revocation.
- Protokoll- und Chiffreanalyse, Markierung veralteter Protokolle und schwacher Chiffren.
- Compliance mapping to PCI DSS, HIPAA and NIST.
- Online-Einstufung vs. skriptfähige CLI zur Automatisierung.
- Berichte und herunterladbare Nachweise für Audits.
- Datenschutz — ob Hostnames Ihre Umgebung verlassen.
Where ImmuniWeb fits
ImmuniWeb's free SSL Security Test checks both web and email servers, validates certificates and grades configuration against PCI DSS, HIPAA and NIST, with a CLI for pipelines. It is a fast, compliance-aware entry point before adopting continuous monitoring.
Run the free test on any host to get an immediate grade and report.