PEM to CRT Converter — Convert PEM Certificate to CRT Free Online

One of the most confusing aspects of SSL certificate management is the proliferation of file extensions: .pem, .crt, .cer, .der, .pfx, .p12. Some are naming conventions, while DER and PKCS#12 are distinct encodings or containers. Understanding this helps you navigate certificate deployment confidently.

PEM format is a Base64-encoded certificate with ASCII armor headers. A certificate starts with -----BEGIN CERTIFICATE----- and ends with -----END CERTIFICATE-----. PEM files can contain multiple blocks (certificate chain + key) concatenated together.

.crt extension identifies a certificate file, but does not guarantee its encoding. A .crt file can contain PEM text or binary DER. Check your destination's requirements before uploading.

This converter reads your PEM certificate file and outputs the same content saved as certificate.crt. The bytes are identical — only the filename changes. This is useful when a control panel or deployment script specifically requires the .crt extension for its certificate upload field.

Try the example file to see a self-signed certificate for example.com. It is for demonstration only and will not establish trust on a public server. Upload a certificate from your own issuer for deployment.