🔒 Free SSL & TLS Certificates Tools 2026
4 ssl & tls certificates tools you can use for free — no credit card required. Includes fully free tools and freemium tiers with generous limits.
- 1
Certbot is the official ACME client for Let's Encrypt certificates. Automates certificate issuance and renewal for Nginx, Apache, and standalone mode on Linux servers.
Best for: System administrators who want automated Let's Encrypt certificate management on Linux servers
- 2
acme.sh is a pure shell ACME client for automating SSL certificates from Let's Encrypt, ZeroSSL, and other ACME-compatible CAs. Lightweight and works on any Unix system.
Best for: Linux sysadmins who want a lightweight ACME client that works on minimal systems without Python
- 3
Let's Encrypt is a free, automated, and open certificate authority that provides SSL/TLS certificates at no cost. Powers HTTPS on 300M+ websites. ACME protocol enables automatic renewal.
Best for: Every developer and business that needs SSL — the baseline choice for free automated HTTPS
- 4
ZeroSSL provides free SSL certificates as an alternative to Let's Encrypt. Also offers paid OV and EV certificates. REST API, ACME support, and monitoring. 90-day free certs.
Best for: Developers who want a Let's Encrypt alternative for CA diversification or need OV/EV certificates
What counts as free?
Every tool on this page has either a fully free plan or a freemium tier that doesn't require a paid subscription to start. We list features, limits, and upgrade paths on each tool's detail page so you know exactly what the free plan includes.
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