Free SSL Certificate Tools

Generate self-signed certificates, get CA-signed certs, decode certificates, and sign CSRs — instantly, with no signup. Supporting developers since 2003.

Supports RSA, ECDSA, and Ed25519 key types. Free certificates up to 30 days. Extended durations available.

Generate Self-Signed Cert CA-Signed Cert

Certificate Tools

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Self-Signed Certificate

Generate a complete certificate set: private key, CSR, certificate, and PKCS#12 bundle. Perfect for development and testing.

Generate

✅

CA-Signed Certificate

Get a certificate signed by the getaCert Certificate Authority. Test trust chains and certificate validation in your applications.

Generate

✏️

Sign a CSR

Already have a Certificate Signing Request? Submit it and get it signed by our CA. No need to generate a new private key.

Sign CSR

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Decode Certificate

Paste any PEM-encoded certificate or CSR and view its details in human-readable form. See subject, issuer, validity, and extensions.

Decode

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Check Domain SSL

Inspect any domain's SSL certificate, chain, expiry, and TLS configuration. Like SSL Labs but faster.

Check

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Let's Encrypt

Get a free, browser-trusted certificate from Let's Encrypt. We handle the ACME protocol — just verify your domain.

Get Cert

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Learn SSL/TLS

Understand how TLS works, certificate types, key algorithms, and common gotchas. Written for developers.

Learn

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SSL Gotchas

Chain order mistakes, expired intermediates, and other common SSL pitfalls that break production.

Read

How It Works

getaCert.com generates real SSL/TLS certificates using OpenSSL, the same tool used by certificate authorities worldwide. You don't need a CSR — just fill in the form and download your files.

Each certificate set includes:

Private Key (.pkey) — Your secret key. Keep this safe.
Certificate Signing Request (.csr) — The request used to generate the cert.
Certificate (.cer/.pem) — The signed certificate in DER and PEM formats.
PKCS#12 Bundle (.p12) — Everything in one file, importable into browsers and servers.

You can view the PEM key blob text inline on the result page, or download each file individually. The default password for private keys and PKCS#12 files is password.

Free & Paid Tiers

Feature	Free	Extended ($4.99)	Long-Term ($9.99)	Portal ($9.99)
Certificate duration	Up to 30 days	31 days – 1 year	1 – 10 years	Up to 10 years
Key types	All (RSA, ECDSA, Ed25519)	All	All	All
Wildcard & SAN	Yes	Yes	Yes	Yes
REST API	—	—	—	100 certs/day
Saved cert history	—	—	—	Yes

Supported Key Types

Choose from modern cryptographic algorithms:

Key Type	Description	Recommended For
RSA 2048	Standard RSA key (most compatible)	General use, maximum browser/server compatibility
RSA 4096	Stronger RSA key	Higher security requirements, government compliance
ECDSA P-256	Elliptic Curve (prime256v1)	Modern apps — fast, compact, widely supported
ECDSA P-384	Elliptic Curve (secp384r1)	Enterprise and government compliance (CNSA suite)
Ed25519	Edwards Curve	Cutting-edge apps — smallest keys, fastest signing

Common Use Cases

Local Development

Need HTTPS on localhost? Generate a self-signed cert and import it into your browser or development server.

CI/CD Pipelines

Automate certificate generation in your build pipeline with our REST API. JSON in, certificate files out.

Learning & Education

Study how SSL certificates work. View the raw PEM data, decode certificates, and understand trust chains.

Testing mTLS

Get CA-signed client certificates to test mutual TLS authentication in your applications.

REST API

Generate certificates programmatically with your portal key.

curl -X POST http://getacert.com/api/v1/self-signed \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer gac_YOUR_PORTAL_KEY" \
  -d '{"cn": "test.example.com", "key_type": "ec256", "days": 365}'

Learn More