Frequently Asked Questions
headtag of the page you generated it for. You also need to move all blocking external requests away from the head: both css and external
scripttags, and instead place them at the end of your page, before the closing body tag.
It is also possible to use the legacy version of the AO powerup plugin. It is not automated, so only consider this if you know your site only has a few pages, and won’t requires updates or maintenance. (it’s a real pain manually maintaining critical css across a whole site - this is the whole reason why criticalcss.com was created in the first place!)
Yes, all payments are handled by Stripe and your bank card information never hits our servers.
It scrapes all CSS from the URL you provide, figures out what parts of that CSS are considered 'critical' for the URL. Some optimizations are then applied on to further reduce the size of the critical css. Finally the tool generates screenshots of the 'critical' section of your URL, with and without the critical css, to test that they look the same. If they don’t the UI will notify you.
Yes. Requests to generate criticalcss via the API are priced at £5 per domain per month, and with it you can fully automate critical css generation. If you are on WordPress it’s recommended to anautomated plugin for this. If you want to use the API manually, to receive the API documentation.