My website is not secure on all browsers

[happydz]

I have installed SSL successfully but I got this error

The certificate is not trusted in all web browsers. You may need to install an Intermediate/chain certificate to link it to a trusted root certificate. Learn more about this error. The fastest way to fix this problem is to contact your SSL provider.

[ChrisPAR]

You can safely ignore this:

Warning: "The certificate is not trusted in all web browsers"

If you have installed an SSL certificate on InfinityFree, you may want to use an SSL Checker tool to verify your SSL certificate was installed correctly. However, when doing so, you see an error like this: The certificate is not trusted in all web browsers. You may need to install an Intermediate/chain certificate to link it to a trusted root certificate. Learn more about this error. The fastest way to fix this problem is to contact your SSL provider. What does this warning mean for your sit…

[happydz]

Is there any way or trick to fix this?

[ChrisPAR]

If you have a custom domain (or plan to get one), you can follow the process I mentioned in a similar topic:

@"ChrisPAR

get a custom domain (or a subdomain from services like eu.org / pp.ua), and then set up Cloudflare (it isn’t supported for InfinityFree subdomains, unfortunately):
A Full Guide To Cloudflare

[happydz]

Correct me if I’m wrong, so you mean my website will still be hosted in Infinityfree and only the SSL will be issued from Cloudflare, right?

[ChrisPAR]

Yes, the site will remain hosted with InfinityFree (unless you choose otherwise). The details about which SSL setting to choose are mentioned in the article I linked.