Self-Signed TLS Certificate Generator - Free Self-Signed Certificate for Localhost, IP Address, and Development
Free self-signed TLS and mTLS certificate generator for localhost, IP addresses, and websites. Generate self-signed certificate files instantly for development and testing.
🔒 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
Simple Mode
Quick certificate generation
mTLS Certificate Generator
Generate mTLS certificates
Advanced Mode
Custom certificate generation
Inspect Certificate
Certificate inspector
Feature Requests
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Generate Free TLS Certificate
Create a self-signed TLS certificate file for localhost, IP addresses, or websites. This free TLS certificate generator supports secure connections for development and testing environments.
TLS (Transport Layer Security) certificate full form: A TLS certificate enables secure connections between servers and clients. Generate your TLS certificate file instantly below.
Certificate generated successfully!
Generate mTLS Certificate
Create a complete self-signed mTLS certificate suite including CA certificate, server certificate, client certificate, and all associated keys.
mTLS (mutual TLS) enables two-way authentication where both the server and client present certificates for verification.
mTLS certificates generated successfully!
All Files
Self-Signed Certificate Generator
Generate a self-signed certificate with custom certificate fields including Common Name, Organization, Location, and more.
Fill in the certificate details below. Fields marked with * are required.
Certificate generated successfully!
Inspect TLS Certificate
View TLS certificate fields, verify certificate details, and check TLS certificate fingerprint. Upload a TLS certificate file or paste a certificate in PEM format to inspect all certificate information.
Use this tool to verify TLS certificate fields, check if a TLS certificate failed verification, view the TLS certificate fingerprint, and examine all certificate details including validity, issuer, and subject information.
Certificate Details
Feature Requests
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What Is OneClickTLS?
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. 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.
Why Use a Self Signed TLS Certificate?
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.
Generate Certificates Without Using OpenSSL Commands
Traditionally, developers need to run commands like:
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.
Key Features
Generate TLS and mTLS certificates instantly
Support for Common Name and multiple Subject Alternative Names
Advanced certificate generation with support for complex certificate configurations
Produces ready to use certificate and private key files
Ideal for testing HTTPS, reverse proxies, Kubernetes, Docker, and local development
No need to remember or maintain OpenSSL commands
When To Use OneClickTLS
Developers choose this tool when they need to test secure connections quickly, including:
Local development with HTTPS
Internal microservices and APIs
Kubernetes Ingress configuration
Docker and container based services
Edge and IoT devices
Reverse proxies such as Nginx, Traefik, or Caddy
mTLS authentication experiments
Automated testing pipelines that require certificates
Frequently Asked Questions
Do self signed certificates work in production?
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.
What are SANs and why are they important?
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.
Is it safe to use an online certificate generator?
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.
What is the difference between TLS and SSL certificates?
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.
Can I use these certificates with Kubernetes?
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.
How do I install a self-signed certificate?
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.
Related Tools and Keywords
OneClickTLS helps with the following search terms and use cases:
Online self signed certificate generatorGenerate TLS certificate onlinemTLS certificate generatorOpenSSL alternative for certificate creationSAN certificate generatorLocal HTTPS certificate toolDeveloper TLS and mTLS testing toolKubernetes certificate generatorDocker TLS certificate tool
Summary
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.
