Valid PEM
- BEGIN/END markers present; base64 decodes -> Valid
security validator
PEM Certificate Validator
Validate PEM-encoded X.509 certificates for correct armor and base64 content—client-side.
Results
Processing…- Status
- Processing...
- Details
- Processing...
- Decoded bytes
- Processing...
How to use this validator
- Paste the PEM certificate.
- Run validate to confirm markers and base64 decoding.
- If invalid, re-check markers and ensure the body is not corrupted.
Rules & checks
Requires BEGIN/END CERTIFICATE markers.
Validates base64 payload decodes successfully.
Runs fully client-side; nothing is uploaded.
Inputs explained
PEM certificate
Paste the public certificate with BEGIN/END CERTIFICATE markers. Do not paste private keys.
When to use it
- Check certs before committing to repos
- Validate customer-provided certs in support flows
- Quick sanity check before deploying TLS configs
Common errors
- Missing BEGIN/END CERTIFICATE markers
- Corrupted or non-base64 body
- Pasting a private key instead of a cert
Limitations
- Format validation only; does not verify trust, expiry, or chain correctness.
- Does not fetch OCSP/CRL or validate SANs/CNs.
Tips
- Paste only public certs; do not paste private keys here
- If you need expiry/issuer details, use an offline openssl/CLI tool
Examples
Missing markers
- No BEGIN/END -> Invalid
Corrupted base64
- Garbled body -> Invalid
Deep dive
This PEM certificate validator checks BEGIN/END markers and base64 decoding entirely in your browser.
Use it to sanity-check public certs before adding them to TLS configs; do not paste private keys.
FAQs
- Is my cert uploaded?
- No. Validation happens locally and clears on refresh.
Related validators
All validation happens in your browser. No data is sent, logged, or stored.
Format validation only; does not verify trust, expiry, or chain correctness.