CSR Decoder
Paste a PEM-encoded Certificate Signing Request to inspect its contents. Runs entirely in your browser.
What is a CSR Decoder?
A CSR decoder reads a PEM-encoded PKCS#10 Certificate Signing Request and displays its contents: the subject distinguished name, public key algorithm and size, signature algorithm, and any requested extensions or attributes.
Use this to verify a CSR before submitting it to a Certificate Authority — confirm the Common Name, Organization, and key details are correct. This tool runs entirely in your browser.
When to use a CSR decoder
- Verify the domain (CN) in a CSR matches your intended certificate
- Confirm the key algorithm and size meet your CA's requirements
- Check organization details before submitting to a CA
- Debug CSR generation issues from OpenSSL or other tools
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