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Screen resolution simulator is a free online tool to test your web page on different screen resolutions. It works on all modern web browsers, including mobile devices such as phones and tablets. This tool does not require any installation. Just open the tool, type your web page URL, and enter your desired screen resolution for the browser. The simulator will automatically resize your webpage, so you can see how it looks at that resolution. It is very useful if you have trouble displaying certain websites on your device or want to set up the best display for your website.