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markdown"><header><h1>PixelRatio</h1></header><p><code>PixelRatio</code> gives you access to the device's pixel density and font scale.</p>
5<h2 class="anchor anchorWithStickyNavbar_JmGV" id=fetching-a-correctly-sized-image>Fetching a correctly sized image<a href=#fetching-a-correctly-sized-image class=hash-link aria-label="Direct link to Fetching a correctly sized image" title="Direct link to Fetching a correctly sized image"></a></h2>
6<p>You should get a higher resolution image if you are on a high pixel density device. A good rule of thumb is to multiply the size of the image you display by the pixel ratio.</p>
7<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token keyword" style=color:#c5a5c5>const</span><span class="token plain"> image </span><span class="token operator" style=color:#fc929e>=</span><span class="token plain"> </span><span class="token function" style=color:#79b6f2>getImage</span><span class="token punctuation" style=color:#657b83>(</span><span class="token punctuation" style=color:#657b83>{</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> width</span><span class="token operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token maybe-class-name">PixelRatio</span><span class="token punctuation" style=color:#657b83>.</span><span class="token method function property-access" style=color:#79b6f2>getPixelSizeForLayoutSize</span><span class="token punctuation" style=color:#657b83>(</span><span class="token number" style=color:#5a9bcf>200</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> height</span><span class="token operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token maybe-class-name">PixelRatio</span><span class="token punctuation" style=color:#657b83>.</span><span class="token method function property-access" style=color:#79b6f2>getPixelSizeForLayoutSize</span><span class="token punctuation" style=color:#657b83>(</span><span class="token number" style=color:#5a9bcf>100</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token punctuation" style=color:#657b83>}</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token tag punctuation" style=color:#657b83><</span><span class="token tag class-name" style=color:#fac863>Image</span><span class="token tag" style=color:#fc929e> </span><span class="token tag attr-name" style=color:#c5a5c5>source</span><span class="token tag script language-javascript script-punctuation punctuation" style=color:#657b83>=</span><span class="token tag script language-javascript punctuation" style=color:#657b83>{</span><span class="token tag script language-javascript" style=color:#fc929e>image</span><span class="token tag script language-javascript punctuation" style=color:#657b83>}</span><span class="token tag" style=color:#fc929e> </span><span class="token tag attr-name" style=color:#c5a5c5>style</span><span class="token tag script language-javascript script-punctuation punctuation" style=color:#657b83>=</span><span class="token tag script language-javascript punctuation" style=color:#657b83>{</span><span class="token tag script language-javascript punctuation" style=color:#657b83>{</span><span class="token tag script language-javascript" style=color:#fc929e>width</span><span class="token tag script language-javascript operator" style=color:#fc929e>:</span><span class="token tag script language-javascript" style=color:#fc929e> </span><span class="token tag script language-javascript number" style=color:#5a9bcf>200</span><span class="token tag script language-javascript punctuation" style=color:#657b83>,</span><span class="token tag script language-javascript" style=color:#fc929e> height</span><span class="token tag script language-javascript operator" style=color:#fc929e>:</span><span class="token tag script language-javascript" style=color:#fc929e> </span><span class="token tag script language-javascript number" style=color:#5a9bcf>100</span><span class="token tag script language-javascript punctuation" style=color:#657b83>}</span><span class="token tag script language-javascript punctuation" style=color:#657b83>}</span><span class="token tag" style=color:#fc929e> </span><span class="token tag punctuation" style=color:#657b83>/></span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div>
8<h2 class="anchor anchorWithStickyNavbar_JmGV" id=pixel-grid-snapping>Pixel grid snapping<a href=#pixel-grid-snapping class=hash-link aria-label="Direct link to Pixel grid snapping" title="Direct link to Pixel grid snapping"></a></h2>
9<p>In iOS, you can specify positions and dimensions for elements with arbitrary precision, for example 29.674825. But, ultimately the physical display only have a fixed number of pixels, for example 640×1136 for iPhone SE (1st generation) or 828×1792 for iPhone 11. iOS tries to be as faithful as possible to the user value by spreading one original pixel into multiple ones to trick the eye. The downside of this technique is that it makes the resulting element look blurry.</p>
10<p>In practice, we found out that developers do not want this feature and they have to work around it by doing manual rounding in order to avoid having blurry elements. In React Native, we are rounding all the pixels automatically.</p>
11<p>We have to be careful when to do this rounding. You never want to work with rounded and unrounded values at the same time as you're going to accumulate rounding errors. Having even one rounding error is deadly because a one pixel border may vanish or be twice as big.</p>
12<p>In React Native, everything in JavaScript and within the layout engine works with arbitrary precision numbers. It's only when we set the position and dimensions of the native element on the main thread that we round. Also, rounding is done relative to the root rather than the parent, again to avoid accumulating rounding errors.</p>
13<h2 class="anchor anchorWithStickyNavbar_JmGV" id=example>Example<a href=#example class=hash-link aria-label="Direct link to Example" title="Direct link to Example"></a></h2>
14<div class=snack-player data-snack-name="PixelRatio Example" data-snack-description="Example usage" data-snack-files="%7B%22App.tsx%22%3A%7B%22type%22%3A%22CODE%22%2C%22contents%22%3A%22import%20React%20from%20'react'%3B%5Cnimport%20%7B%5Cn%20%20Image%2C%5Cn%20%20PixelRatio%2C%5Cn%20%20ScrollView%2C%5Cn%20%20StyleSheet%2C%5Cn%20%20Text%2C%5Cn%20%20View%2C%5Cn%7D%20from%20'react-native'%3B%5Cnimport%20%7BSafeAreaView%2C%20SafeAreaProvider%7D%20from%20'react-native-safe-area-context'%3B%5Cn%5Cnconst%20size%20%3D%2050%3B%5Cnconst%20cat%20%3D%20%7B%5Cn%20%20uri%3A%20'https%3A%2F%2Freactnative.dev%2Fdocs%2Fassets%2Fp_cat1.png'%2C%5Cn%20%20width%3A%20size%2C%5Cn%20%20height%3A%20size%2C%5Cn%7D%3B%5Cn%5Cnconst%20App%20%3D%20()%20%3D%3E%20(%5Cn%20%20%3CSafeAreaProvider%3E%5Cn%20%20%20%20%3CSafeAreaView%20style%3D%7Bstyles.container%7D%3E%5Cn%20%20%20%20%20%20%3CScrollView%20style%3D%7Bstyles.scrollContainer%7D%3E%5Cn%20%20%20%20%20%20%20%20%3CView%20style%3D%7Bstyles.container%7D%3E%5Cn%20%20%20%20%20%20%20%20%20%20%3CText%3ECurrent%20Pixel%20Ratio%20is%3A%3C%2FText%3E%5Cn%20%20%20%20%20%20%20%20%20%20%3CText%20style%3D%7Bstyles.value%7D%3E%7BPixelRatio.get()%7D%3C%2FText%3E%5Cn%20%20%20%20%20%20%20%20%3C%2FView%3E%5Cn%20%20%20%20%20%20%20%20%3CView%20style%3D%7Bstyles.container%7D%3E%5Cn%20%20%20%20%20%20%20%20%20%20%3CText%3ECurrent%20Font%20Scale%20is%3A%3C%2FText%3E%5Cn%20%20%20%20%20%20%20%20%20%20%3CText%20style%3D%7Bstyles.value%7D%3E%7BPixelRatio.getFontScale()%7D%3C%2FText%3E%5Cn%20%20%20%20%20%20%20%20%3C%2FView%3E%5Cn%20%20%20%20%20%20%20%20%3CView%20style%3D%7Bstyles.container%7D%3E%5Cn%20%20%20%20%20%20%20%20%20%20%3CText%3EOn%20this%20device%20images%20with%20a%20layout%20width%20of%3C%2FText%3E%5Cn%20%20%20%20%20%20%20%20%20%20%3CText%20style%3D%7Bstyles.value%7D%3E%7Bsize%7D%20px%3C%2FText%3E%5Cn%20%20%20%20%20%20%20%20%20%20%3CImage%20source%3D%7Bcat%7D%20%2F%3E%5Cn%20%20%20%20%20%20%20%20%3C%2FView%3E%5Cn%20%20%20%20%20%20%20%20%3CView%20style%3D%7Bstyles.container%7D%3E%5Cn%20%20%20%20%20%20%20%20%20%20%3CText%3Erequire%20images%20with%20a%20pixel%20width%20of%3C%2FText%3E%5Cn%20%20%20%20%20%20%20%20%20%20%3CText%20style%3D%7Bstyles.value%7D%3E%5Cn%20%20%20%20%20%20%20%20%20%20%20%20%7BPixelRatio.getPixelSizeForLayoutSize(size)%7D%20px%5Cn%20%20%20%20%20%20%20%20%20%20%3C%2FText%3E%5Cn%20%20%20%20%20%20%20%20%20%20%3CImage%5Cn%20%20%20%20%20%20%20%20%20%20%20%20source%3D%7Bcat%7D%5Cn%20%20%20%20%20%20%20%20%20%20%20%20style%3D%7B%7B%5Cn%20%20%20%20%20%20%20%20%20%20%20%20%20%20width%3A%20PixelRatio.getPixelSizeForLayoutSize(size)%2C%5Cn%20%20%20%20%20%20%20%20%20%20%20%20%20%20height%3A%20PixelRatio.getPixelSizeForLayoutSize(size)%2C%5Cn%20%20%20%20%20%20%20%20%20%20%20%20%7D%7D%5Cn%20%20%20%20%20%20%20%20%20%20%2F%3E%5Cn%20%20%20%20%20%20%20%20%3C%2FView%3E%5Cn%20%20%20%20%20%20%3C%2FScrollView%3E%5Cn%20%20%20%20%3C%2FSafeAreaView%3E%5Cn%20%20%3C%2FSafeAreaProvider%3E%5Cn)%3B%5Cn%5Cnconst%20styles%20%3D%20StyleSheet.create(%7B%5Cn%20%20scrollContainer%3A%20%7B%5Cn%20%20%20%20flex%3A%201%2C%5Cn%20%20%7D%2C%5Cn%20%20container%3A%20%7B%5Cn%20%20%20%20justifyContent%3A%20'center'%2C%5Cn%20%20%20%20alignItems%3A%20'center'%2C%5Cn%20%20%7D%2C%5Cn%20%20value%3A%20%7B%5Cn%20%20%20%20fontSize%3A%2024%2C%5Cn%20%20%20%20marginBottom%3A%2012%2C%5Cn%20%20%20%20marginTop%3A%204%2C%5Cn%20%20%7D%2C%5Cn%7D)%3B%5Cn%5Cnexport%20default%20App%3B%22%7D%7D" data-snack-dependencies=react-native-safe-area-context data-snack-platform=web data-snack-supported-platforms=ios,android,web data-snack-theme=light data-snack-preview=true data-snack-loading=lazy data-snack-device-frame=false></div>
15<hr>
16<h1>Reference</h1>
17<h2 class="anchor anchorWithStickyNavbar_JmGV" id=methods>Methods<a href=#methods class=hash-link aria-label="Direct link to Methods" title="Direct link to Methods"></a></h2>
18<h3 class="anchor anchorWithStickyNavbar_JmGV" id=get><code>get()</code><a href=#get class=hash-link aria-label="Direct link to get" title="Direct link to get"></a></h3>
19<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token keyword" style=color:#c5a5c5>static</span><span class="token plain"> </span><span class="token function" style=color:#79b6f2>get</span><span class="token punctuation" style=color:#657b83>(</span><span class="token punctuation" style=color:#657b83>)</span><span class="token operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div>
20<p>Returns the device pixel density. Some examples:</p>
21<ul>
22<li><code>PixelRatio.get() === 1</code>
23<ul>
24<li><a href=https://material.io/tools/devices/ target=_blank rel="noopener noreferrer">mdpi Android devices</a></li>
25</ul>
26</li>
27<li><code>PixelRatio.get() === 1.5</code>
28<ul>
29<li><a href=https://material.io/tools/devices/ target=_blank rel="noopener noreferrer">hdpi Android devices</a></li>
30</ul>
31</li>
32<li><code>PixelRatio.get() === 2</code>
33<ul>
34<li>iPhone SE, 6S, 7, 8</li>
35<li>iPhone XR</li>
36<li>iPhone 11</li>
37<li><a href=https://material.io/tools/devices/ target=_blank rel="noopener noreferrer">xhdpi Android devices</a></li>
38</ul>
39</li>
40<li><code>PixelRatio.get() === 3</code>
41<ul>
42<li>iPhone 6S Plus, 7 Plus, 8 Plus</li>
43<li>iPhone X, XS, XS Max</li>
44<li>iPhone 11 Pro, 11 Pro Max</li>
45<li>Pixel, Pixel 2</li>
46<li><a href=https://material.io/tools/devices/ target=_blank rel="noopener noreferrer">xxhdpi Android devices</a></li>
47</ul>
48</li>
49<li><code>PixelRatio.get() === 3.5</code>
50<ul>
51<li>Nexus 6</li>
52<li>Pixel XL, Pixel 2 XL</li>
53<li><a href=https://material.io/tools/devices/ target=_blank rel="noopener noreferrer">xxxhdpi Android devices</a></li>
54</ul>
55</li>
56</ul>
57<hr>
58<h3 class="anchor anchorWithStickyNavbar_JmGV" id=getfontscale><code>getFontScale()</code><a href=#getfontscale class=hash-link aria-label="Direct link to getfontscale" title="Direct link to getfontscale"></a></h3>
59<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token keyword" style=color:#c5a5c5>static</span><span class="token plain"> </span><span class="token function" style=color:#79b6f2>getFontScale</span><span class="token punctuation" style=color:#657b83>(</span><span class="token punctuation" style=color:#657b83>)</span><span class="token operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div>
60<p>Returns the scaling factor for font sizes. This is the ratio that is used to calculate the absolute font size, so any elements that heavily depend on that should use this to do calculations.</p>
61<ul>
62<li>on Android value reflects the user preference set in <strong>Settings > Display > Font size</strong></li>
63<li>on iOS value reflects the user preference set in <strong>Settings > Display & Brightness > Text Size</strong>, value can also be updated in <strong>Settings > Accessibility > Display & Text Size > Larger Text</strong></li>
64</ul>
65<p>If a font scale is not set, this returns the device pixel ratio.</p>
66<hr>
67<h3 class="anchor anchorWithStickyNavbar_JmGV" id=getpixelsizeforlayoutsize><code>getPixelSizeForLayoutSize()</code><a href=#getpixelsizeforlayoutsize class=hash-link aria-label="Direct link to getpixelsizeforlayoutsize" title="Direct link to getpixelsizeforlayoutsize"></a></h3>
68<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token keyword" style=color:#c5a5c5>static</span><span class="token plain"> </span><span class="token function" style=color:#79b6f2>getPixelSizeForLayoutSize</span><span class="token punctuation" style=color:#657b83>(</span><span class="token plain">layoutSize</span><span class="token operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div>
69<p>Converts a layout size (dp) to pixel size (px).</p>
70<p>Guaranteed to return an integer number.</p>
71<hr>
72<h3 class="anchor anchorWithStickyNavbar_JmGV" id=roundtonearestpixel><code>roundToNearestPixel()</code><a href=#roundtonearestpixel class=hash-link aria-label="Direct link to roundtonearestpixel" title="Direct link to roundtonearestpixel"></a></h3>
73<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token keyword" style=color:#c5a5c5>static</span><span class="token plain"> </span><span class="token function" style=color:#79b6f2>roundToNearestPixel</span><span class="token punctuation" style=color:#657b83>(</span><span class="token plain">layoutSize</span><span class="token operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div>
74<p>Rounds a layout size (dp) to the nearest layout size that corresponds to an integer number of pixels. For example, on a device with a PixelRatio of 3, <code>PixelRatio.roundToNearestPixel(8.4) = 8.33</code>, which corresponds to exactly (8.33 * 3) = 25 pixels.</div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class=editButtons_t0bR><a href=https://github.com/facebook/react-native-website/edit/main/docs/pixelratio.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_bHB7 aria-hidden=true><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"/></g></svg>Edit page for next release</a><a href=https://github.com/facebook/react-native-website/edit/main/website/versioned_docs/version-0.79/pixelratio.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_bHB7 aria-hidden=true><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"/></g></svg>Edit page for current release</a></div><div class=lastUpdated_VsjB><span class=theme-last-updated>Last updated<!-- --> on <b><time datetime=2025-04-14T14:14:17.000Z itemprop=dateModified>Apr 14, 2025</time></b></span></div></div></footer></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href=/docs/panresponder><div class=pagination-nav__sublabel>Previous</div><div class=pagination-nav__label>PanResponder</div></a><a class="pagination-nav__link pagination-nav__link--next" href=/docs/platform><div class=pagination-nav__sublabel>Next</div><div class=pagination-nav__label>Platform</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_XG6w thin-scrollbar theme-doc-toc-desktop"><ul 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