Certificate Type Comparison: Self-Signed vs CA-Signed vs Let's Encrypt

Quick Comparison Table

Understanding Certificate Types

Self-Signed Certificates

A self-signed certificate is signed by its own private key rather than a trusted CA. The encryption is identical to any other certificate — the only difference is that browsers and operating systems do not trust it by default.

When to use self-signed certificates:

• Local development (localhost, 127.0.0.1)
• Testing SSL/TLS configurations before deploying
• CI/CD pipelines and automated testing
• Docker Compose and Kubernetes dev clusters
• Internal tools where you control all clients
• Learning how TLS works

Limitations:

• Browsers show a security warning
• Clients must explicitly trust the certificate or disable verification
• Not suitable for public-facing production sites
• No third-party validation of identity

Generate a self-signed certificate — instant, no signup required.

CA-Signed Certificates (getaCert.com)

getaCert.com operates a private Certificate Authority. CA-signed certificates from getaCert include a proper chain of trust — your certificate is signed by our CA, and you can install our CA root certificate on your systems to establish trust.

When to use getaCert CA-signed certificates:

• Internal services where you control the trust store
• Development environments shared across a team
• Testing certificate chain validation
• mTLS (mutual TLS) between microservices
• When you need a proper cert chain but not public trust

Advantages over self-signed:

• Proper certificate chain (leaf → CA root)
• Can issue multiple certificates under one trusted root
• Closer to production behavior for testing
• Supports CSR signing workflows

Generate a CA-signed certificate or sign your own CSR.

Let's Encrypt

Let's Encrypt is a free, publicly trusted CA run by the nonprofit ISRG. It issues Domain Validation (DV) certificates via the ACME protocol, which tools like certbot and acme.sh automate.

When to use Let's Encrypt:

• Any public-facing website or API
• Production services that need browser trust
• Automated environments with certbot or cert-manager
• When 90-day validity with auto-renewal is acceptable

Limitations:

• DV only — no Organization or Extended Validation
• 90-day maximum validity requires renewal automation
• Rate limits: 50 certificates per domain per week
• No support beyond community forums
• No warranty coverage

You can get a Let's Encrypt certificate through getaCert.com's Let's Encrypt proxy, or by running certbot directly on your server.

Commercial CAs (DigiCert, Sectigo, GlobalSign)

Commercial CAs offer DV, OV, and EV certificates with dedicated support, warranties, and compliance documentation. Prices range from $60/year for basic DV to $600+/year for EV certificates.

When to use commercial certificates:

• Extended Validation (EV) required by policy or regulation
• Organization Validation (OV) for displaying company name
• PCI DSS, HIPAA, or SOC 2 compliance requirements
• Financial warranties needed (up to $2M with some providers)
• 24/7 phone support required
• Code signing or document signing

For a detailed comparison of commercial providers, see our provider comparison guide.

Decision Flowchart

Is this for production with real users?

• No → Use a self-signed or CA-signed certificate from getaCert.com
• Yes → Continue below

Do you need OV or EV validation?

• No → Use Let's Encrypt (free, automated, trusted)
• Yes → Use a commercial CA (see comparison)

Do you need validity longer than 90 days?

• Let's Encrypt auto-renews — 90-day validity is not a problem if you have automation
• If you cannot automate renewal, a commercial CA with 1-year certificates may be simpler

Encryption Strength Comparison

All certificate types use the same underlying cryptography. The encryption negotiated between client and server depends on the TLS version and cipher suite, not the certificate type.

A self-signed RSA-2048 certificate provides exactly the same AES-256-GCM session encryption as a $500 DigiCert EV certificate. The certificate type affects trust, not security.

Cost Comparison

Summary

For most developers, the path is clear:

1. Development and testing — getaCert.com for instant certificates
2. Production websites — Let's Encrypt for free, automated, trusted certs
3. Enterprise compliance — Commercial CAs when policy requires OV/EV

You do not need to pay for SSL encryption. Free certificates are cryptographically identical to paid ones. Pay only when you need extended validation, warranties, or dedicated support.