ZeroSSL
ZeroSSL is an SSL certificate authority and SSL management platform offering free 90-day SSL certificates, ACME integrations, and a REST API.
Last updated September 15, 2026
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Overview
ZeroSSL is an SSL certificate authority and SSL management platform. According to its official site, it lets users issue and renew free 90-day SSL certificates in under 5 minutes and automate certificate management through ACME integrations and a REST API. Its About page states that it launched in early 2016, initially to facilitate setup and installation of free 90-day SSL certificates issued by third-party vendors, and later became a trusted certificate authority issuing its own certificates. It reports more than 500,000 customers and over 1 million certificates issued monthly.
History
ZeroSSL launched in early 2016. Its initial purpose was to facilitate the setup and installation of free 90-day SSL certificates issued by third-party vendors. As its user base grew, it took the step of becoming a trusted certificate authority itself, issuing authentic SSL certificates. Its About page states it is built on three principles: accessibility, usability, and automation.
Products and positioning
Free and low-cost SSL security for everyone, with developer-friendly automation and a better alternative to Let's Encrypt and old-school SSL companies.
Free 90-day SSL certificates
Issue and renew free 90-day SSL certificates in under 5 minutes.
Annual SSL certificates
Annual SSL certificates offered by ZeroSSL.
Wildcard SSL certificates
Wildcard SSL certificates offered by ZeroSSL.
SSL REST API
Automate SSL certificate management, supporting certificate issuance, CSR validation, and more.
ACME integrations
Manage and renew existing certificates through ACME integrations.
Recent events
HID agrees to sell PKI business to Vista Equity Partners[4]
Reported:
Assa Abloy agreed to sell HID’s public key infrastructure (PKI) business to Vista Equity Partners. The business includes IdenTrust, HydrantID, ZeroSSL and credential management software. The sale is subject to customary closing conditions and is expected to close in the fourth quarter of 2026.
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