Free SSL guide • 2026
Free SSL Certificate Providers Compared
Let's Encrypt, ZeroSSL, Buypass Go SSL and Cloudflare Universal SSL — side by side. Same browser padlock, same encryption, different trade-offs. Pick the right one, then monitor it for free.
Independent comparison • Not affiliated with Let's Encrypt, ZeroSSL, Buypass or Cloudflare
The short answer
For 95% of websites, Let's Encrypt via your hosting provider or certbot is the right default. It's free, automated, trusted everywhere, and supports wildcards.
Pick ZeroSSL if you want a friendlier web UI and one-year paid options on the side. Pick Buypass Go SSL if you want 180-day certificates instead of 90. Pick Cloudflare Universal SSL if your site is already proxied through Cloudflare — you get free SSL with zero setup.
Whichever you choose, the real failure mode is the same: auto-renewal silently breaks and the certificate expires. That is the gap Certimon fills with free Telegram reminders.
Free SSL providers at a glance
Domain Validation only. All four are trusted in every modern browser. Always confirm current limits with the provider — rate limits and policies change.
| Provider | Lifetime | Wildcard | ACME | Best for |
|---|---|---|---|---|
| Let's Encrypt | 90 days | Yes (DNS-01) | Yes — fully automated | Default choice for almost everyone |
| ZeroSSL | 90 days (free) | Yes (DNS validation) | Yes (with EAB credentials) | Friendly web UI, optional 1-year paid tier |
| Buypass Go SSL | 180 days | No | Yes (ACME) | Fewer renewal cycles, simpler ops |
| Cloudflare Universal SSL | Auto-managed (~90 days) | Apex + 1 level by default | Not needed — handled by Cloudflare | Sites already proxied through Cloudflare |
| Google Trust Services | 90 days | Yes | Yes (with EAB) | Google Cloud customers, ACME redundancy |
All providers issue DV (Domain Validation) certificates only. For OV/EV you still need a paid CA.
The four free SSL providers in detail
1. Let's Encrypt
The non-profit CA that made free SSL the norm. Issues 90-day DV certificates over the ACME protocol. Supported by virtually every hosting platform (Vercel, Netlify, Render, Fly, cPanel, Plesk, Caddy, Traefik) and the standard certbot client.
- • Pros: Universal client support, wildcard via DNS-01, generous rate limits for most sites, true non-profit governance.
- • Cons: 90-day lifetime means more frequent renewals; no expiration emails since June 2025; rate limits can bite at large CDN/hosting scale.
- • Use it when: You want the default, the most-tested path, and the broadest tooling.
2. ZeroSSL
Operated by IdenTrust (parent of Sectigo). Offers free 90-day DV certs through both a click-through web UI and ACME with External Account Binding (EAB). Paid tiers add 1-year DV and multi-domain options.
- • Pros: Web dashboard for non-technical users, REST API, supports wildcard, optional paid tiers without changing CA.
- • Cons: ACME requires EAB setup (extra step), free tier capped on issuance volume, dashboard pushes you toward paid plans.
- • Use it when: You don't want to install certbot, or you need a friendly UI for occasional manual issuance.
3. Buypass Go SSL
A Norwegian CA offering free DV certificates with a notable twist: 180-day lifetime instead of the typical 90. ACME-compatible, so it works with certbot, acme.sh, lego and friends — just point at the Buypass directory URL.
- • Pros: Half as many renewals as Let's Encrypt, fully ACME-automated, useful as a backup CA for redundancy.
- • Cons: No wildcard support, smaller community / fewer tutorials, fewer hosting platforms default to it.
- • Use it when: You want fewer renewal cycles or want a second CA in case Let's Encrypt rate-limits or has an outage.
4. Cloudflare Universal SSL
Not a CA you talk to directly — Cloudflare provisions and renews a free DV certificate for any domain you proxy through them. Issued from Google Trust Services / Let's Encrypt under the hood. Zero setup beyond pointing your DNS at Cloudflare.
- • Pros: Truly zero-config, auto-renewed, includes edge TLS termination, works for unlimited domains on the free plan.
- • Cons: Only covers the apex and one subdomain level by default (deeper wildcards need Advanced Certificate Manager, paid); your traffic must go through Cloudflare's proxy; opaque visibility into the underlying CA.
- • Use it when: You're already on Cloudflare or want the simplest possible HTTPS setup.
How to choose
- • Just need HTTPS, no opinions? Use whatever your hosting platform issues — it's almost certainly Let's Encrypt or Cloudflare. Done.
- • Self-hosting on a VPS? Install certbot or Caddy and use Let's Encrypt. The tooling is the deepest there.
- • Hate renewing every 90 days? Buypass Go SSL gives you 180-day certs for the same $0.
- • Want a UI, not a CLI? ZeroSSL's dashboard is the friendliest of the four.
- • Already on Cloudflare? Universal SSL is on by default — you don't need to do anything.
- • Need wildcard? Let's Encrypt or ZeroSSL via DNS-01. Buypass doesn't issue wildcards.
- • Need OV/EV identity-validated certs? None of these. You need a paid CA — see our paid vs free SSL comparison.
The hidden cost of free SSL: silent expiry
Free certificates are designed for automated renewal — but auto-renewal fails more often than people admit. DNS records change, port 80 gets firewalled, the cron job stops running after a server reboot, an ACME challenge breaks because you added a redirect. The cert quietly hits its last day and your site starts throwing browser warnings.
Let's Encrypt stopped sending expiration emails in June 2025, removing the safety net many teams unknowingly relied on. ZeroSSL, Buypass and Cloudflare don't reliably alert you either.
Certimon is a free, independent watcher: it checks any public HTTPS endpoint and Telegram-pings you before the certificate expires. CA-agnostic — works for every provider on this page.
Set up a free 30-day expiry reminder
- 1. Open @CertimonBot on Telegram.
- 2. Send
/remind example.com 30 - 3. You'll get a Telegram message 30 days before that domain's certificate expires — Let's Encrypt, ZeroSSL, Buypass, Cloudflare or any other CA.
FAQ
Who provides free SSL certificates?
Let's Encrypt, ZeroSSL, Buypass Go SSL and Google Trust Services all issue free Domain Validation certificates trusted by every major browser. Cloudflare also provides free Universal SSL for any domain proxied through Cloudflare.
Is a free SSL certificate as secure as a paid one?
Yes. Free DV certificates use the same TLS encryption and the same browser trust roots as paid DV certificates. The differences are validation level (DV vs OV vs EV), warranty and support — not cryptographic strength.
Which free SSL provider supports wildcard certificates?
Let's Encrypt and ZeroSSL both issue free wildcard certificates via DNS-01 ACME validation. Buypass Go SSL doesn't issue wildcards. Cloudflare Universal SSL covers the apex plus one subdomain level; deeper wildcards require Advanced Certificate Manager (paid).
How long do free SSL certificates last?
Let's Encrypt and ZeroSSL: 90 days. Buypass Go SSL: 180 days. Cloudflare Universal SSL: auto-renewed (typically every 90 days). All are designed for automated renewal.
How do I monitor a free SSL certificate so it doesn't silently expire?
Auto-renewal can fail silently when DNS, ports or configs drift. A separate alerting path is the safety net. Send /remind example.com 30 to @CertimonBot for a Telegram alert 30 days before expiry — works for any CA.
Pick a free SSL. Then make sure it never silently expires.
Let's Encrypt, ZeroSSL, Buypass, Cloudflare — all free, all auto-renewed, all capable of failing quietly. Certimon Telegram alerts catch the renewals that don't happen.
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