Self Signed Certificate Generator
Use Self Signed Certificate Generator on AboveTool. Hash, encrypt, decode, and sign data in your browser — keys never leave your device. Free, no signup.
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About Self Signed Certificate Generator
Self Signed Certificate Generator is used by developers to generate a self-signed TLS/SSL certificate for local development, testing, and internal tools. It generates a key pair and creates an X.509 certificate signed by the same key, valid for the common name and domains you specify. Self-signed certificates are fine for local and internal use, but browsers will warn users about them on public-facing sites — use a CA-signed cert for production. Self Signed Certificate Generator runs entirely in your browser at abovetool.com — keys, passwords, and file contents never leave your device.
How to use
- Enter your input text, file, or token in the workspace.
- Choose algorithm or options where available.
- Click the action button — results appear instantly in your browser.
Features
- Web Crypto API where supported
- Keys and plaintext stay on your device
- Hash, encode, JWT, AES, and more
- Free with no account
Frequently asked questions
What is Self Signed Certificate Generator used for?
Self Signed Certificate Generator is used by developers to generate a self-signed TLS/SSL certificate for local development, testing, and internal tools.
How does Self Signed Certificate Generator work?
It generates a key pair and creates an X.509 certificate signed by the same key, valid for the common name and domains you specify.
Any tips for using this tool?
Self-signed certificates are fine for local and internal use, but browsers will warn users about them on public-facing sites — use a CA-signed cert for production.
Is Self Signed Certificate Generator free on AboveTool?
Yes. Self Signed Certificate Generator is free to use on abovetool.com with no account required.
Are my keys or data uploaded to a server?
No. Self Signed Certificate Generator runs entirely in your browser — keys, passwords, and file contents never leave your device.