X-Frame-Options or Content-Security-Policy header that blocks embedding entirely — if a frame stays blank, that's the site refusing to be framed, not a bug here. When it works, this shows the real, live page at each width.
Check your HTML and preview your website on desktop, tablet, and mobile screens with our simple online mobile friendly testing tool.
Check your HTML and preview your website at different screen widths
X-Frame-Options or Content-Security-Policy header that blocks embedding entirely — if a frame stays blank, that's the site refusing to be framed, not a bug here. When it works, this shows the real, live page at each width.
Hey guys, a website may look great on a computer, but what about when someone opens it on a phone or tablet? A good website should adjust to different screen sizes and stay easy to use.
Sometimes a page may look perfect on a desktop but look too wide, too small, or hard to use on a phone. That is why we made our Mobile Friendly Test. It gives you a quick way to check your HTML and see how your page looks at different screen sizes.
Now, let us see what our tool can do and how you can use it.
A Mobile Friendly Test online is a simple way to check if a web page is ready for people using phones and tablets. It looks at important parts of your HTML, such as the viewport tag, zoom settings, small fonts, fixed-width elements, responsive CSS, and website icons.
Our tool also lets you see your page at Desktop (1280px), Tablet (768px), and Mobile (375px) widths. This helps you spot things that may not look right on smaller screens.
Here are the simple steps to use our tool:
Want to place our tool on your own website? You can use the embed option from LGATools:
Our online mobile friendly checker gives you simple checks and previews to help you review your web page:
Our mobile friendliness checker can be useful in many website tasks. Here are some common ways you can use it:
We made our mobile friendly website test to make page checking feel simple instead of confusing. You can quickly review your page and understand the results without dealing with a long or difficult report.
A mobile-friendly page should be easy to read and use on a small screen. Keep your content simple, make sure important buttons are easy to tap, and avoid elements that are too wide for the screen:
Here are some common issues you may see while using the tool:
The Live Device Preview gives you three views of your page.
Keep in mind that this is a best-effort preview. Some websites do not allow themselves to be loaded inside an iframe. When that happens, the preview may stay blank because the website has blocked framing.
So guys, we have reached the final part of our guide. By now, you know how to use the HTML checker, how to view your page on desktop, tablet, and mobile widths, and how to understand some common issues.
Personal Recommendation: I recommend making a quick three-screen check before putting your page online. It is an easy step that can help you notice layout problems that may be missed when checking only one screen.
If you have a question, suggestion, or problem with our tool, please get in touch through LGATools.com. We always appreciate your feedback and are here to help whenever you need us.
You may have some questions about how to check mobile friendly website, so we have answered the most common ones below:
A mobile friendly site test helps you check some important parts of a web page for mobile use. Our tool also lets you see how a page looks at Desktop (1280px), Tablet (768px), and Mobile (375px) widths.
You can use our tool for a quick check:
The HTML check looks for several useful signals in your markup:
The preview gives you three different views. Desktop uses 1280px, Tablet uses 768px, and Mobile uses 375px. You can compare these views to see if your page changes well as the screen gets smaller.
A blank preview does not always mean there is a problem with the tool. Some websites have security rules that do not allow their pages to be loaded inside an iframe. This can happen because of settings such as X-Frame-Options or Content-Security-Policy.
If this happens, the website itself may be refusing to be shown inside the preview. You can still use the Analyze HTML section to check the HTML signals supported by the tool.
Not completely. The responsive CSS check looks for @media queries inside embedded <style> blocks. External stylesheets are not visible to this check, so their media queries will not be included in the result.
The viewport tag helps the browser handle a web page on different screen sizes. If it is missing or not set correctly, a page may not behave as expected on a phone. Our checker looks for this tag in the HTML you provide.
Yes. You can check your HTML while you are still working on your page. This is useful when you are building a new page or fixing an existing one.
You can also use the device preview to look at the page before making it live. This can help you find layout problems early.
The Analyze HTML check runs entirely in your browser. This means the HTML analysis is performed on your own device rather than needing the code to be sent away for the check.
A ✕ means the checker did not find the expected signal for that particular check. It does not always mean your whole website is bad or unusable.
For example, a responsive CSS check may show ✕ when your @media rules are in an external stylesheet, because that stylesheet is not visible to the tool.
Yes. It is useful to run another check after changing your HTML or page layout. You can compare the results and look at the different device views again.
This is especially helpful before publishing a new page or finishing a major design update.
No. Our tool is made for a quick mobile-friendly check, not a complete test of every part of a website. It checks the HTML signals listed in the tool and provides live previews at three screen widths.
So, if you want a simple way to review your markup and see how a page looks on different screen sizes, this tool can be a useful starting point.