🔄 Free SSL Certificate Converter
Convert SSL/TLS certificates between PEM, DER, PFX/PKCS#12, and P7B/PKCS#7 formats — instantly, securely, in your browser.
✔ Free & instant ✔ Secure (runs 100% in your browser) ✔ No files sent to any server.
Conversion Result
What Is an SSL Certificate Converter?
An SSL certificate converter transforms certificate files from one encoding or container format to another without changing the underlying cryptographic data. Different server platforms, operating systems, and hosting control panels require certificates in specific formats — our free converter lets you switch between them instantly, all within your browser.
The converter supports:
- PEM ↔ DER ↔ PFX / PKCS#12 ↔ P7B / PKCS#7
- Extracting certificate, private key and CA chain from PFX bundles
- Building PFX files with optional password protection
⚠️ Important: If converting to PFX, keep the output file and its password secure. Loss of the private key means you will need to reissue the certificate.
How to Use the SSL Certificate Converter (Step-by-Step)
- Select your current certificate format (PEM, DER, PFX, or P7B) from the first dropdown.
- Choose your target format using the second dropdown.
- Paste your certificate into the input field, or upload your file for DER and PFX inputs.
- If converting to or from PFX, enter the password and optionally paste your private key and CA chain.
- Click Convert Certificate.
- Copy or download the converted output and install it on your server.
Which Format Does My Server Need?
- Apache / Nginx / cPanel / Plesk / Linux: PEM format (.crt / .pem + .key)
- Microsoft IIS / Exchange: PFX / PKCS#12 (.pfx)
- Java / Tomcat: PFX or P7B (import via keytool)
- Android / iOS apps: DER or PFX depending on the SDK
- Windows Certificate Store: PFX or P7B
Is This Converter Safe?
Yes. All cryptographic operations are performed locally in your browser using JavaScript. We never store or transmit your certificate data, private keys, or passwords.
Frequently Asked Questions (FAQ)
What's the difference between PEM and CRT files?
There is no functional difference — both are PEM-encoded certificates. The file extension (.pem, .crt, .cer) is just a naming convention. All three contain the same Base64-encoded data wrapped in -----BEGIN CERTIFICATE----- headers.
Do I need my private key to convert a certificate?
Only when converting to PFX / PKCS#12 format. For all other conversions (PEM ↔ DER ↔ P7B), no private key is needed.
What if I forget my PFX password?
PFX files are encrypted and cannot be opened without the correct password. If lost, you will need to reissue the certificate from your Certificate Authority.
Can I convert a wildcard or SAN certificate?
Yes. The converter works identically for DV, OV, EV, Wildcard, and Multi-Domain (SAN) SSL certificates.
Need an SSL Certificate?
After generating your certificate, you can order SSL Certificates from https://mysslpro.com:
- Domain Validated (DV) SSL
- Organization Validated (OV) SSL
- Extended Validation (EV) SSL
- Wildcard SSL Certificates
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