For roughly the first two decades of the public web, an SSL certificate cost between $50 and $1,500 a year. Then in 2015, Let's Encrypt launched as a free, automated, non-profit certificate authority — and within five years it became the largest CA on the internet by certificate volume. The obvious question for any site owner today: do you need to pay for a certificate at all?
The short answer is "almost never, but sometimes." This guide covers what the actual differences are, who each option is for, and which differences are real versus marketing.
What Browsers Actually See
Before getting into features, it's important to be clear about one thing: browsers do not distinguish between Let's Encrypt and paid certificates from the same validation tier. A Domain Validated (DV) certificate from Let's Encrypt produces the exact same green padlock, the exact same connection security, and the exact same level of user trust as a DV certificate that costs $80 a year from a commercial CA. The encryption is identical. The browser UI is identical. From a visitor's perspective, there is no observable difference.
This is the most important fact in the comparison, and it's the one paid CAs work hardest to obscure with marketing language about "premium" certificates and "trust seals." If you're being told a paid DV certificate is more secure than a free one, you're being sold to.
Validation Levels: DV, OV, and EV
Where Let's Encrypt and paid CAs genuinely differ is in the validation tiers they offer.
Domain Validation (DV) proves you control the domain. Let's Encrypt only issues DV certificates. The entire validation is automated — typically a DNS or HTTP challenge — and takes seconds. Most paid CAs also offer DV, usually around $30–$80 a year.
Organisation Validation (OV) additionally verifies that your business legally exists. The CA checks public records, may call you to confirm details, and the certificate includes the verified company name. OV certificates take 1–5 days to issue and cost $80–$300 a year. Let's Encrypt does not offer OV.
Extended Validation (EV) is a more thorough version of OV — full legal entity verification, physical address confirmation, audited authorisation. EV certificates cost $150–$1,000+ a year, take 1–10 days, and historically displayed the company name in green next to the URL bar.
Here's the catch with EV: browsers stopped showing the green company name in 2019. Chrome, Firefox, and Safari now display EV certificates identically to DV certificates — the company name only appears if you click into the certificate details, which roughly nobody does. The original sales pitch for EV — visible visual trust — no longer exists. EV still has uses (formal regulatory contexts, high-assurance B2B integrations), but for visitor-facing trust on the open web, it's no longer differentiated.
Cost
Let's Encrypt is free with no per-domain or per-certificate fees, no rate-card pricing, and no upgrade tiers. It's funded by sponsors and donations and operated by the non-profit Internet Security Research Group.
Paid certificates range from about $10 a year (for budget DV from resellers) up to $1,500+ a year for premium EV or wildcard certificates from major CAs. The "premium" tiers don't include better encryption; they include things like higher warranty amounts (more on that below), faster issuance, dedicated support, and bundled extras like vulnerability scanning.
The "Warranty" Marketing
Most paid CAs advertise a "warranty" of $10,000 to $1.75 million per certificate. The number is large and prominent on every comparison page. It is also almost entirely meaningless.
The warranty pays out only if the CA itself misissues the certificate (issues a valid cert for your domain to someone who isn't you), and the misissuance directly causes a financial loss to a relying party (your visitor), and the relying party successfully claims against the CA. There is no public record of a meaningful payout from any of these warranties in the modern history of the CA industry. They are not insurance for you, they are an indemnity for visitors against the CA, and the conditions for triggering them are essentially never met.
Treat the warranty as marketing copy, not a feature you can rely on.
Automation and Renewal
Let's Encrypt was designed around automation. Certificates are valid for 90 days, and the standard tooling (Certbot, acme.sh, win-acme, or built-in support in Caddy and Traefik) renews automatically without human involvement. Once set up, you don't think about renewal at all. If something breaks, you find out from monitoring rather than from an expired certificate taking down the site.
Paid certificates are typically valid for one year (longer was banned by browsers in 2020), and most CAs still issue them via a manual web flow: download a CSR, paste it into a portal, complete validation, download the issued cert, install it. Some commercial CAs now offer ACME automation that mirrors Let's Encrypt's approach, but it's not universal — many cheap resellers don't support it.
The automation gap is the single biggest practical difference between the two options. A Let's Encrypt setup that's been running for three years is typically untouched in those three years. A manually renewed paid cert is a recurring task with a real failure mode (forgetting it).
Browser Trust
Both Let's Encrypt and major paid CAs are trusted by every modern browser, OS, and device that's been updated in the last several years. Specifically:
- All current versions of Chrome, Firefox, Safari, Edge, and Opera trust Let's Encrypt without issue.
- iOS, Android, macOS, Windows, and major Linux distributions all include Let's Encrypt's roots in their default trust stores.
- Older devices that haven't been updated since before mid-2021 may have issues with Let's Encrypt's chain after the IdenTrust cross-sign expired. This affects a vanishingly small share of real-world traffic today, but if you must support, e.g., original iPhones from 2010, paid CAs with legacy roots are slightly more reliable.
For any normal site in 2026, this is a non-issue.
Support
Let's Encrypt is a non-profit and provides community support only — there's a forum, excellent documentation, and a GitHub issue tracker. There is no paid support, no SLA, and no phone line.
Paid CAs offer business-hours support (sometimes 24/7), dedicated account managers at higher tiers, and direct lines for critical issues. For an enterprise where a certificate problem at 2am is a P1 incident with revenue implications, this is genuinely valuable. For a small site or developer running their own infrastructure, the Let's Encrypt community forum is, in practice, faster than most paid CA support queues.
Issuance Time
Let's Encrypt issues certificates in seconds. Paid DV certs are usually similar (most have moved to automated validation). OV takes 1–5 days. EV takes 1–10 days, sometimes longer if there's a hold on document verification.
If you need a certificate for a launch tomorrow morning, Let's Encrypt is the only option that's guaranteed to deliver in time.
Wildcards and Multi-Domain Certs
Let's Encrypt supports wildcard certificates (e.g. *.example.com) at no extra charge — a feature that costs $100–$300 a year with most paid CAs. They also support multi-domain (SAN) certificates with up to 100 hostnames per certificate. For a site with many subdomains or a small SaaS handling tenant subdomains, this used to be a significant paid-cert cost; now it's free.
Wildcard certs do require DNS validation rather than HTTP validation, which means your DNS provider needs to support API-based record updates (most do — Cloudflare, Route 53, DigitalOcean, Linode, etc. all work with the standard ACME DNS plugins).
When You Should Pay
Despite all the above, there are still real cases where a paid certificate is the right choice:
- You need OV or EV for compliance or regulatory reasons. Some industries — finance, healthcare, government tendering — require validated organisation identity in the certificate. Let's Encrypt can't issue these.
- You need a paid SLA on issuance and revocation. If your operations require contractually guaranteed response times from the CA, you need a paid relationship.
- You need to support legacy devices that don't trust Let's Encrypt's roots. Rare, but real if you're shipping to embedded hardware, set-top boxes, or pre-2016 mobile devices.
- Your security policy or auditor requires it. Some organisations have policies that mandate paid certificates from a specific approved list. Argue with the policy if you can; if you can't, pay.
- You need a code-signing or email signing certificate. Different category — Let's Encrypt only does TLS server certificates.
When Let's Encrypt Is Obviously the Right Choice
- Personal sites, blogs, portfolios.
- Small business websites without specific regulatory pressure.
- Internal tools and admin dashboards.
- Most SaaS products serving the open web.
- Anywhere you have many subdomains and don't want to pay per-cert fees.
- Ecommerce sites — the padlock is the same, the encryption is the same, the visitor trust is the same.
The Practical Recommendation
For most sites: use Let's Encrypt with automated renewal, monitor it with a free tool like SSL Checker, and put the money you'd have spent on certificates into things that actually move the needle — performance, content, design, marketing.
If you have a specific reason to need OV or EV, buy the smallest validation tier that satisfies the requirement, automate renewal where possible, and don't pay for "warranty" tiers that promise more than they deliver.
Either way, run a regular check. SSL Checker works the same whether the cert is free or paid — it'll tell you what you've got, when it expires, and whether anything's misconfigured.