CSR Decoder
Decode Certificate Signing Requests
CSR Input
Paste PEM-encoded CSR
CSR Details
Decoded information
CSR details will appear here...
About CSR
A Certificate Signing Request (CSR) is a message sent to a Certificate Authority (CA) to apply for a digital identity certificate. It contains the public key and organization information.
Decode PEM-encoded Certificate Signing Requests to extract subject information (CN, O, L, ST, C). Useful for verifying CSR contents before submitting to a Certificate Authority.
Key Features
- ✓PEM CSR parsing
- ✓Subject field extraction (CN, O, L, ST, C)
- ✓DER size analysis
- ✓Format validation
- ✓Client-side processing
How to CSR Decoder Online
- 1
Paste CSR
Paste a PEM CSR starting with -----BEGIN CERTIFICATE REQUEST-----.
- 2
Decode
Click decode to extract the subject information.
- 3
Verify
Check that the fields match your intended certificate details.
Common Use Cases
- •Verifying CSR before CA submission
- •Debugging SSL certificate enrollment
- •Checking domain name and organization in CSR
- •Auditing certificate request contents
Frequently Asked Questions
What is a CSR?▼
A Certificate Signing Request (CSR/PKCS#10) is a message sent to a Certificate Authority to apply for a digital identity certificate. It contains the public key and organization information.