X.509 Certificate Tool

Generate self-signed certificates or convert Base64 strings into downloadable files directly in your browser.

Create a self-signed certificate

Fill in the fields and generate a self-signed certificate as a .pfx file. The download starts automatically once the certificate is ready.

Certificate subject

Certificate expiry (months)

Password (optional) Leave blank to skip password protection.

Paste a Base64-encoded certificate string to convert it to a .cer file. The generated certificate downloads automatically.