ZeroSSL
Free and paid ACME SSL certificates for any website
Best for
Web developers and small businesses needing free DV SSL via ACME
Skip if
You need built-in CDN, hosting, or unlimited free certificates
What is ZeroSSL?
ZeroSSL is a certificate authority that issues X.509 certificates using the ACME protocol, offering both free domain-validated certificates and paid options with extended validation and wildcard support. It provides a web dashboard for manual issuance and an API for automated workflows. The service integrates with popular automation tools, supports RSA and ECC keys, and offers enterprise-grade features such as dedicated support and SLA-backed issuance for large-scale deployments.
SpecificationsAI-estimated
Key Features of ZeroSSL
Use Cases for ZeroSSL
Personal Blog
Secure a personal website with a free 90-day SSL certificate.
E-commerce Store
Deploy paid wildcard certificates to protect multiple subdomains.
SaaS Platform
Automate certificate renewal across hundreds of tenant domains via ACME.
IoT Device Management
Use ECC certificates for lightweight, secure communication with devices.
Pros & Cons of ZeroSSL
Pros
- Free tier provides fully functional DV certificates.
- Supports ACME standard, compatible with existing tooling.
- Wildcard and extended-validation options available.
- Simple web dashboard for manual issuance.
Cons
- Limited rate limits on the free tier.
- Paid plans require subscription and may be pricey for small sites.
- No built-in CDN or hosting services.
Frequently Asked Questions
How long are ZeroSSL free certificates valid?
Free domain-validated certificates are valid for 90 days.
Can I get a wildcard certificate for free?
Wildcard certificates are only available with paid plans.
Is ZeroSSL compatible with Let's Encrypt clients?
Yes, it implements the ACME protocol, so any ACME client works.
What support is provided for paid customers?
Paid subscribers receive priority email support and optional SLA guarantees.
Pricing Overview
View full pricing →Detailed plans are not listed. Visit the official website for pricing information.
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