# Cert Decoder

> Cert Decoder - Free online tool to decode SSL/TLS certificates in PEM format.

- **Website**: https://certdecoder.com
- **Uneed Page**: https://www.uneed.best/tool/cert-decoder
- **Pricing**: Free
- **Category**: Development
- **Tags**: Cryptography, Security, Testing
- **Submitted by**: @jurijs
- **Launch Date**: 2025-06-28

## About

Cert Decoder is a free, browser-based tool designed to decode X.509 SSL/TLS certificates in PEM format. It provides detailed insights into certificate attributes, including:

- Issuer

- Validity period

- Subject Alternative Names (SAN)

- Serial number

- Fingerprint, and more.

Operating entirely on the client-side, Cert Decoder ensures that all decoding processes occur securely within your browser, safeguarding your privacy by eliminating any data transmission to external servers.

Whether you’re a developer, security professional, or simply need quick access to SSL/TLS certificate details, Cert Decoder offers a fast, secure, and reliable solution without compromising sensitive information.