You can check the preview of your responsive site for various display sizes and resolutions of devices such as desktop, mobile, and tablet.

1) Go to the website below.
https://responsivedesignchecker.com/

2) Enter the site address for which you want to check the responsive preview.

3) Display the default desktop preview of the entered site.

4) Select the device and display size and resolution on the left to display the responsive preview of your site.