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"&lt;h2&gt;What is a 320x100?&lt;/h2&gt;rnThe 320x100u00a0ad unitu00a0is a &lt;a href=&quot;https://support.google.com/adsense/answer/6002621&quot;&gt;top-performing AdSense ad size&lt;/a&gt;, which is (surprisingly) not included in theu00a0&lt;a href=&quot;https://www.iab.com/wp-content/uploads/2015/11/IAB_Display_Mobile_Creative_Guidelines_HTML5_2015.pdf&quot; target=&quot;_blank&quot; rel=&quot;noopener noreferrer&quot;&gt;IAB Mobile standard ad units&lt;/a&gt;. It has the dimensions of 320 pixelsu00a0wide by 100 pixels tall.rnrnThis ad size is known as a Large Mobile Banner and is the big brother of the 320x50 and 300x50 ad units. A 320x100 ad unit is most commonly used as an ad on smartphones and is the largest of the mobile-specific banner ads.rnrn&amp;nbsp;rn&lt;h2&gt;What it looks like&lt;/h2&gt;rnThe large mobile banner dimensions are 320 x 100 pixels.rn&lt;strong&gt;Note:&lt;/strong&gt; The live ad may not always load for &lt;a href=&quot;https://theonlineadvertisingguide.com/glossary/fill-rate/&quot; target=&quot;_blank&quot; rel=&quot;noopener noreferrer&quot;&gt;technical reasons&lt;/a&gt;, and instead a backup image will show. Because AdSense runs this as a multi-sized ad slot, a 320x50 will occasionally appear floating in the space.rn&lt;div class=&quot;example320x100&quot; style=&quot;width: 320px; min-height: 100px; margin: 0px auto;&quot;&gt;&lt;script async src=&quot;https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-1477655248507271&quot;rn     crossorigin=&quot;anonymous&quot;&gt;&lt;/script&gt;rn&lt;!-- 320x100 Demo --&gt;rn&lt;ins class=&quot;adsbygoogle&quot;rn     style=&quot;display:inline-block;width:320px;height:100px&quot;rn     data-ad-client=&quot;ca-pub-1477655248507271&quot;rn     data-ad-slot=&quot;9885352477&quot;&gt;&lt;/ins&gt;rn&lt;script&gt;rn     (adsbygoogle = window.adsbygoogle || []).push({});rn&lt;/script&gt;&lt;/div&gt;rn&amp;nbsp;rn&lt;h2&gt;320x100 Advice for Site Owners&lt;/h2&gt;rnA 320x100 is listed as a &lt;a href=&quot;https://support.google.com/adsense/answer/6002621?hl=en-GB&quot; target=&quot;_blank&quot; rel=&quot;noopener noreferrer&quot;&gt;top-performing ad unit by Google AdSense&lt;/a&gt;, so is probably worth trying for websites with a lot of mobile traffic. This fact alone means it should certainly be implemented instead of the smaller 320x50 if possible.rnrnIt is unlikely to be an especially strong revenue driver as it is not a very large ad. This is because larger ads perform better than small ones. It is potentially a good way to monetise mobile ad impressions, however.rnrn&lt;strong&gt;Note:u00a0&lt;/strong&gt;These ads are often run as &quot;Anchor units&quot;. This means they float on top of the webpage at the bottom of the screen. If you implement this sort of ad, make sure there is an easy way to close the anchor unit. If you don't then you risk overly annoying your users.rnrn&amp;nbsp;rn&lt;h2&gt;320u00d7100 Advice for Ad Buyers&lt;/h2&gt;rn320x100s are small ad sizes, but the largest available mobile-specific banner. This makes it likely more effective than other mobile banners, but that effectiveness likely comes at a price. If you are able to buy this ad size at a price that ensures you a positive ROI, then we highly recommend it. If not, then perhaps just stick to 300x250s, which can run both on mobile and desktop devices.rnrnTo get the most out of a 320x100 you have to make the best use of the small space available to you. This means having a very concise message and call to action, which can fit in the space.rnrn&amp;nbsp;rn&lt;h2&gt;Summary&lt;/h2&gt;rn&lt;img class=&quot;aligncenter size-full wp-image-9697&quot; src=&quot;https://theonlineadvertisingguide.com/wp-content/uploads/2019/02/Gls_320x100.png&quot; alt=&quot;&quot; width=&quot;1024&quot; height=&quot;512&quot; /&gt;rnrn&amp;nbsp;rn&lt;h2&gt;Find out more&lt;/h2&gt;rn&lt;ul class=&quot;starlist&quot;&gt;rn t&lt;li&gt;&lt;a href=&quot;https://theonlineadvertisingguide.com/ad-size-guide/&quot;&gt;Ad Size Guide&lt;/a&gt;&lt;/li&gt;rn&lt;/ul&gt;"
<https://theonlineadvertisingguide.com/glossary/320x100/>