免费的 TLS 证书工具：生成自签名证书（简单或高级）并检查现有证书。为开发和测试创建证书，或解码证书详细信息。
🔒 We do not store any generated certificates, private keys, or uploaded files. All processing happens in memory and is immediately discarded. Learn more in our Privacy Policy
Generate self-signed TLS certificates or inspect existing certificates. Choose from simple generation, advanced generation with custom fields, or certificate inspection.
Use these tools to create certificates for development and testing, or decode and analyze existing certificates.
A self-signed TLS certificate is a digital certificate that is signed by its own creator rather than by a trusted Certificate Authority (CA). Unlike certificates issued by public CAs like Let's Encrypt or DigiCert, self-signed certificates are free to generate and don't require verification of domain ownership. They are perfect for development, testing, and internal network use where browser trust warnings are acceptable.
Self-signed certificates are ideal for several scenarios:
Our advanced certificate generator gives you full control over all certificate fields, allowing you to create certificates that match your specific requirements. Configure Common Name, Organization, Location, key size, signing algorithm, and validity period to create certificates tailored to your needs.
Our TLS certificate decoder allows you to inspect and analyze any TLS certificate in detail. Simply upload a certificate file or paste the certificate in PEM format, and our tool will decode all certificate fields, verify validity, and display comprehensive certificate information.
Our certificate inspector displays all important certificate details:
Simple mode generates certificates with default settings optimized for quick use. Advanced mode allows you to customize all certificate fields, key sizes, algorithms, and validity periods to match your specific requirements.
Self-signed certificates provide the same encryption strength as CA-issued certificates. The difference is trust: browsers don't trust self-signed certificates by default because they can't verify the identity of the certificate creator. For internal use and development, this is perfectly acceptable.
Our certificate decoder supports PEM format (.pem, .crt, .cer, .cert files). PEM format is the most common format and is used by most web servers and applications.
OneClickTLS is an online tool that helps developers instantly generate self-signed TLS and mTLS certificates. Instead of searching for complicated OpenSSL commands or creating long scripts, you can generate certificates in seconds by entering your Common Name and SANs. Whether you're looking for TLS generation online or need to generate TLS certificates quickly, this tool provides a fast and secure solution. The tool uses a powerful Go backend with advanced certificate generation capabilities. All processing happens securely on the server, and produces ready-to-use certificate and key files for development and testing environments.
Self-signed certificates are commonly used for development, debugging, local HTTPS setups, staging environments, internal services, and API testing. They help simulate secure communication without requiring a trusted certificate authority. A properly created certificate prevents browser warnings and avoids repetitive manual OpenSSL commands.
Traditionally, developers need to run commands like:
openssl req -new -newkey rsa:2048 -nodes -keyout key.pem -out cert.pem \
-subj "/CN=example.com" \
-addext "subjectAltName=DNS:example.com,DNS:www.example.com"These commands are powerful, but they are also difficult to remember. OneClickTLS eliminates this problem by creating TLS certificates automatically based on simple form inputs.
When it comes to mTLS (mutual TLS), the complexity increases significantly. Setting up mTLS requires generating a Certificate Authority (CA), server certificates, client certificates, and managing certificate chains - a process that can involve multiple OpenSSL commands and configuration files. OneClickTLS simplifies this entire workflow, generating a complete mTLS certificate suite with just a few clicks, saving developers significant time and reducing the chance of configuration errors.
Developers choose this tool when they need to test secure connections quickly, including:
Self-signed certificates are not trusted by browsers or clients in production environments. They are only intended for testing, development, or internal systems where trust can be manually configured.
Subject Alternative Names allow a certificate to support multiple domains or IPs. Modern browsers and TLS clients often ignore the Common Name and rely on SAN values for verification.
Yes, OneClickTLS is safe to use. As detailed in our Privacy Policy, we do not store any generated certificates, private keys, or uploaded files. All processing happens in server memory and is immediately discarded after the response is sent. Your data is never logged, tracked, or shared with third parties. All communication is encrypted via HTTPS to protect your data in transit.
TLS (Transport Layer Security) is the modern successor to SSL (Secure Sockets Layer). While the terms are often used interchangeably, TLS is the current standard for secure communications. Our tool generates TLS certificates that are compatible with all modern systems.
Yes! OneClickTLS certificates work perfectly with Kubernetes Ingress controllers, service meshes, and other Kubernetes components that require TLS certificates. Simply generate your certificate and configure it in your Kubernetes secrets.
After generating your certificate, you can install it in your web server (Nginx, Apache, etc.) or application. For local development, you may also need to add the certificate to your system's trust store to avoid browser warnings.
OneClickTLS helps with the following search terms and use cases:
OneClickTLS makes it simple to generate self-signed TLS or mTLS certificates without dealing with long command line instructions. It is fast, private, browser based, and built for developers who need self-signed certificates for development and testing environments. Self-signed certificates are perfect for local development, internal services, and testing scenarios where a trusted certificate authority is not required. This page helps search engines understand the purpose and value of the tool, allowing it to rank naturally without frequent updates.