TLS Version Checker
This TLS Version Checker tests which TLS protocols a website supports, including TLS 1.0, 1.1, 1.2, and TLS 1.3, and detects insecure legacy protocol exposure.
About This Tool
The TLS Version Checker tests which Transport Layer Security (TLS) protocols a website supports, including TLS 1.0, TLS 1.1, TLS 1.2, and TLS 1.3. It helps identify insecure legacy protocol exposure and modern encryption support.
TLS is responsible for securing HTTPS connections between users and websites. Outdated TLS versions such as TLS 1.0 and TLS 1.1 are considered insecure and should be disabled to prevent downgrade and cryptographic attacks.
This tool allows you to:
- Detect supported TLS versions
- Identify insecure legacy protocol exposure
- Verify TLS 1.3 support
- Assess overall transport security strength
- Improve compliance with modern security standards
The TLS analysis is performed using live secure socket connections. No domain data is stored, logged, or shared.
FAQ — TLS & Cipher Negotiation Detector
What is TLS?
TLS (Transport Layer Security) is a cryptographic protocol that encrypts data transmitted between a user’s browser and a web server.
What does negotiated TLS version mean?
The negotiated TLS version is the actual security protocol version used during a secure connection between your server and the client.
Why is TLS 1.3 better than TLS 1.2?
TLS 1.3 is faster and more secure. It removes outdated cryptographic algorithms and reduces handshake latency, improving both performance and security.
What is a cipher suite?
A cipher suite defines the encryption algorithm, key exchange method, and authentication mechanism used to secure a TLS connection.
Is 128-bit encryption secure?
Yes. Modern 128-bit AES encryption (especially in TLS 1.3) is considered secure and widely used by major websites.
Why should TLS 1.0 and TLS 1.1 be disabled?
TLS 1.0 and 1.1 are outdated and vulnerable to security attacks. Modern servers should only allow TLS 1.2 and TLS 1.3.
