10 Years of Let's Encrypt Certificates

Let's Encrypt has publisheda retrospective that covers the decade since it published its firstpublicly trusted certificate in September 2015:

In March 2016, we issued our one millionth certificate. Just two yearslater, in September 2018, we were issuing a million certificates everyday. In 2020 we reached a billion total certificates issued and as oflate 2025 we're frequently issuing ten million certificates perday. We're now on track to reach a billion active sites, probablysometime in the coming year.