CSR Decoder

Decode Certificate Signing Requests (CSR) instantly. View SAN, subject fields, key size, signature algorithm, and public key — all processed locally in your browser.

Decode CSR

OR
Decoded CSR
Subject
CN
O
OU
L
ST
C
Email
SAN (Subject Alternative Names)
—
Key Details
Key Algorithm
Key Size
Signature Algorithm
Public Key (PEM)
Raw JSON

How to Use the CSR Decoder

  1. Paste your CSR (Certificate Signing Request) in PEM format into the text area, OR upload a .csr file from your device.
  2. Click Decode CSR to extract all certificate request details instantly.
  3. View parsed information including Subject, SAN, Key Details, Public Key, and Signature Algorithm.
  4. Export results in JSON or TXT format, or copy decoded data for certificate issuance or audits.

All decoding happens locally in your browser. No CSR data is uploaded or stored.

About This CSR Decoder

The VINAR TECH CSR Decoder allows you to analyze Certificate Signing Requests directly in your browser. PEM-formatted CSRs are parsed locally using secure client-side cryptography, ensuring complete privacy and zero data transfer to any server.

What Information You Can Decode

  • Subject fields: CN, O, OU, L, ST, C, Email
  • SAN (Subject Alternative Names), including wildcard and multi-domain
  • Key algorithm: RSA or ECC
  • Key size & public key details
  • Signature algorithm used to sign the CSR
  • Raw decoded JSON for debugging and certificate validation

When This Tool Is Useful

  • Verifying CSR details before submitting to a Certificate Authority
  • Auditing SSL certificate deployments
  • Checking SAN domains in multi-domain certificates
  • Inspecting key strength (RSA/ECC) for compliance
  • Debugging misconfigured or malformed CSR files

Because everything is processed locally on your device, the CSR Decoder is suitable for sensitive production environments, enterprise PKI, DevOps pipelines, and SSL automation workflows.

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Frequently Asked Questions

Yes. Decoding happens entirely inside your browser using client-side processing. No CSR content is uploaded or stored on any server.

The tool extracts CN, O, OU, L, ST, C, email address, SAN fields, key algorithm, key size, signature algorithm, and public key.

Yes. SAN entries including multiple domains and wildcard (*.) entries are fully supported and displayed in the results.

Yes. You can export decoded CSR information as JSON, TXT, or copy it directly to your clipboard for auditing or certificate requests.
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Security Tips
  • Never share your private key.
  • Store private keys offline or in a secure vault.
  • Use DNS-01 validation for wildcard certificates.