{"id":104,"date":"2026-07-16T08:49:10","date_gmt":"2026-07-16T08:49:10","guid":{"rendered":"https:\/\/allmediatools.com\/blog\/dpi-vs-ppi-explained\/"},"modified":"2026-07-16T08:49:10","modified_gmt":"2026-07-16T08:49:10","slug":"dpi-vs-ppi-explained","status":"publish","type":"post","link":"https:\/\/allmediatools.com\/blog\/dpi-vs-ppi-explained\/","title":{"rendered":"DPI vs PPI: What&#8217;s the Difference? (Image Resolution Explained)"},"content":{"rendered":"\n<p class=\"article-intro wp-block-paragraph\">DPI and PPI get used interchangeably so often that most people assume they&#8217;re the same thing. They&#8217;re not. PPI (pixels per inch) describes a digital image on a screen. DPI (dots per inch) describes a physical print. Here&#8217;s what each one actually measures, why &#8220;72 DPI for web&#8221; is a myth, and what really controls your file size and quality.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">PPI: Pixels Per Inch (Screens and Digital Images)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">PPI describes how densely pixels are packed into an inch of a digital image or display. A photo that is 3000 \u00d7 2000 pixels contains a fixed number of pixels \u2014 6 million of them \u2014 no matter what device displays it. PPI only becomes meaningful when you talk about a specific physical size: that same image is 10 inches wide at 300 PPI, or 41.6 inches wide at 72 PPI.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A digital image file doesn&#8217;t have an inherent size in inches.<\/strong> It has pixel dimensions. PPI is just a label describing how those pixels would map to inches if printed or displayed at a particular density. Change the PPI number without resampling, and the pixel count \u2014 and file size \u2014 barely change at all.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">DPI: Dots Per Inch (Physical Printing)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DPI describes something physical: how many ink or toner dots a printer lays down per inch of paper. This is a property of the printer, not the image file. Because printers build up color and shading using multiple overlapping dots per pixel (halftoning), DPI and PPI aren&#8217;t even a 1:1 mapping \u2014 a printer might use 4+ physical dots to render one image pixel&#8217;s color information.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Why the Two Terms Get Confused<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Photoshop&#8217;s image size dialog has long labeled its pixel-density field &#8220;Resolution&#8221; in units of pixels\/inch, but the broader industry has used &#8220;DPI&#8221; as a catch-all term for both concepts for so long that it stuck. The practical fix: for a <strong>screen or digital file<\/strong>, think PPI. For a <strong>physical printer<\/strong>, think DPI. Only the second one involves actual ink dots.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">The &#8220;72 DPI for Web&#8221; Myth<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Browsers don&#8217;t read or care about an image&#8217;s embedded DPI\/PPI metadata at all \u2014 they render based purely on pixel dimensions relative to CSS display size<\/li>\n\n\n\n<li>The &#8220;72 DPI&#8221; number traces back to 1980s Mac displays and has had no technical relevance to modern screens (90\u2013500+ PPI) for decades<\/li>\n\n\n\n<li>A 3000\u00d72000 image tagged &#8220;72 DPI&#8221; and the same image tagged &#8220;300 DPI&#8221; render identically in every browser \u2014 the metadata is ignored<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What actually matters for web images is pixel dimensions<\/strong>, not any DPI\/PPI tag. If an image needs to display at 800 pixels wide, export it at 800 pixels wide (or 1600 for crisp rendering on high-density screens).<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">How Resolution Actually Relates to File Size<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Factor<\/th><th>Effect on file size<\/th><\/tr><\/thead><tbody><tr><td>Pixel dimensions (width \u00d7 height)<\/td><td>Directly proportional \u2014 more pixels = more data<\/td><\/tr><tr><td>Compression format (JPEG, PNG, WebP)<\/td><td>Large \u2014 JPEG\/WebP discard redundant data, PNG doesn&#8217;t<\/td><\/tr><tr><td>Compression quality setting<\/td><td>Large \u2014 lower quality = smaller file, same pixel count<\/td><\/tr><tr><td>Color depth (8-bit vs 16-bit)<\/td><td>Moderate \u2014 more bits per pixel = larger file<\/td><\/tr><tr><td>DPI\/PPI metadata tag<\/td><td>None \u2014 this is just a label, not image data<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">If you change &#8220;Resolution&#8221; from 72 to 300 in an editor <strong>without resampling<\/strong>, file size barely moves \u2014 you&#8217;ve only edited a metadata tag. Relabeling DPI never improves print quality either: the pixel data is identical, it just claims to print smaller.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What DPI Should You Actually Use?<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Use case<\/th><th>Recommended<\/th><\/tr><\/thead><tbody><tr><td>Standard document\/photo printing<\/td><td>300 DPI<\/td><\/tr><tr><td>Large-format prints (posters, banners)<\/td><td>150 DPI<\/td><\/tr><tr><td>Fine art \/ professional photo prints<\/td><td>300\u2013600 DPI<\/td><\/tr><tr><td>Website images, social media, email<\/td><td>Pixel dimensions matter, not DPI<\/td><\/tr><tr><td>Screens (phones, monitors, TVs)<\/td><td>PPI is a hardware spec, not something you set<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Rule of thumb for print: multiply your target physical size by your target DPI to get required pixel dimensions (8\u00d710 inches at 300 DPI = 2400\u00d73000 pixels). If your source doesn&#8217;t have enough pixels, no DPI relabeling fixes that.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">How to Check an Image&#8217;s DPI\/PPI<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Windows:<\/strong> Right-click the file \u2192 Properties \u2192 Details tab \u2192 &#8220;Horizontal\/Vertical resolution&#8221; under Image<\/li>\n\n\n\n<li><strong>Mac:<\/strong> Open in Preview \u2192 \u2318I to show the inspector \u2192 General tab shows resolution alongside pixel dimensions<\/li>\n\n\n\n<li><strong>Online tools:<\/strong> Most display pixel dimensions immediately on upload \u2014 the number that actually matters for web use<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Getting Your Image to the Right Pixel Dimensions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Since pixel dimensions actually control quality and file size, the practical next step is getting your image to the correct pixel size for its destination, then compressing it efficiently. AllMediaTools doesn&#8217;t edit DPI metadata directly \u2014 no pixel-based web image tool needs to \u2014 but once you know your target pixel dimensions:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><a href=\"\/blog\/resize-image-online-free\">Resize an image to the right pixel dimensions<\/a> for your use case.<\/li>\n\n\n\n<li>Run it through <a href=\"https:\/\/allmediatools.com\/image-compressor\">AllMediaTools Image Compressor<\/a> to shrink file size without visible quality loss \u2014 see our guide on <a href=\"\/blog\/how-to-compress-images-without-losing-quality\">compressing images without losing quality<\/a>.<\/li>\n<\/ol>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/allmediatools.com\/image-compressor\">Compress Your Image Free \u2192<\/a><\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What DPI should I use for printing?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">300 DPI is standard for most document and photo printing at normal viewing distance. Large-format prints like posters and banners can use 150 DPI or lower without a visible quality drop, since they&#8217;re viewed from further away.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does changing DPI change file size?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Only if the change also resamples the image (adds or removes actual pixels). Editing just the DPI\/PPI metadata tag, without resampling, leaves pixel data untouched and barely affects file size.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What PPI is good for a website?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PPI\/DPI metadata is irrelevant for websites \u2014 browsers ignore it and render based on pixel dimensions alone. Export at the pixel width the image will actually display at, and roughly double that for crisp rendering on high-density &#8220;Retina&#8221; screens.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How do I check an image&#8217;s DPI?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">On Windows, right-click the file \u2192 Properties \u2192 Details \u2192 Image section. On Mac, open it in Preview and press \u2318I. Most online image tools show pixel dimensions immediately, which is the more useful number for anything screen-related.<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>DPI and PPI get used interchangeably so often that most people assume they&#8217;re the same thing. They&#8217;re not. PPI (pixels per inch) describes a digital image on a screen. DPI (dots per inch) describes a physical print. Here&#8217;s what each one actually measures, why &#8220;72 DPI for web&#8221; is a myth, and what really controls &#8230; <a title=\"DPI vs PPI: What&#8217;s the Difference? (Image Resolution Explained)\" class=\"read-more\" href=\"https:\/\/allmediatools.com\/blog\/dpi-vs-ppi-explained\/\" aria-label=\"Read more about DPI vs PPI: What&#8217;s the Difference? (Image Resolution Explained)\">Read more<\/a><\/p>\n","protected":false},"author":0,"featured_media":105,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[16],"tags":[226,223,222,225,224],"class_list":["post-104","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-image-optimization","tag-72-dpi-web-myth","tag-dpi-meaning","tag-dpi-vs-ppi","tag-image-resolution-explained","tag-ppi-meaning"],"jetpack_featured_media_url":"https:\/\/allmediatools.com\/blog\/wp-content\/uploads\/2026\/07\/seo-publish-dpi-vs-ppi-explained.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/allmediatools.com\/blog\/wp-json\/wp\/v2\/posts\/104","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/allmediatools.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/allmediatools.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/allmediatools.com\/blog\/wp-json\/wp\/v2\/comments?post=104"}],"version-history":[{"count":0,"href":"https:\/\/allmediatools.com\/blog\/wp-json\/wp\/v2\/posts\/104\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/allmediatools.com\/blog\/wp-json\/wp\/v2\/media\/105"}],"wp:attachment":[{"href":"https:\/\/allmediatools.com\/blog\/wp-json\/wp\/v2\/media?parent=104"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/allmediatools.com\/blog\/wp-json\/wp\/v2\/categories?post=104"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/allmediatools.com\/blog\/wp-json\/wp\/v2\/tags?post=104"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}