About TLS Viewer
I am currently building a new and improved version of TLS Viewer. Read more
Welcome to TLS Viewer! This web tool is designed to help anyone — from curious beginners to experienced developers — explore the world of SSL/TLS certificates in detail. Whether you’re debugging a server setup, learning about certificate chains, or just curious about how HTTPS works under the hood, TLS Viewer gives you a transparent look at what servers are presenting.
When you enter a host name, TLS Viewer connects directly to the server over a secure TLS connection and retrieves the full certificate chain. Instead of silently trusting the server, it shows everything the server sends, so you can inspect and understand the full chain of trust.
What TLS Viewer Shows
For each certificate in the chain, TLS Viewer provides:
- PEM and DER formats: The certificate data in both human-readable (PEM) and binary (DER) formats, making it easy to export or analyze further.
- Fingerprints: SHA-256, SHA-1, and MD5 hashes of each certificate, useful for verifying integrity and identifying certificates quickly.
- Parsed fields: Subject, issuer, validity period, and detailed extensions such as key usage, subject alternative names, and more.
- Raw TLS handshake information: Technical details from the server connection, useful for debugging and learning how TLS works.
Why TLS Viewer Exists
Understanding certificates and TLS can be tricky. Many tools only show part of the picture, or they automatically verify and hide details. TLS Viewer strips away the verification layer (don’t worry — it’s for educational purposes) to show you exactly what the server is sending. This makes it perfect for:
- Learning about TLS and certificate chains
- Debugging server SSL/TLS configurations
- Checking certificate fingerprints and validity periods
- Gaining insights into the structure of certificates and their extensions
Contact
If you have nay questions or ideas: emanuel.rukavina@tlsviewer.com