{"id":4487,"date":"2026-08-08T13:00:00","date_gmt":"2026-08-08T03:00:00","guid":{"rendered":"https:\/\/printshop.paperlust.co\/blog\/?p=4487"},"modified":"2026-11-12T15:22:35","modified_gmt":"2026-11-12T04:22:35","slug":"poster-size-in-pixels-and-dpi","status":"publish","type":"post","link":"https:\/\/printshop.paperlust.co\/blog\/poster-size-in-pixels-and-dpi","title":{"rendered":"Poster Size in Pixels: What Resolution You Actually Need"},"content":{"rendered":"<style>\n#post-4487 .entry-content p { font-size:20px; line-height:1.7; }\n#post-4487 .entry-content h2 { font-size:34px; line-height:1.3; text-transform:none; margin-top:48px; }\n#post-4487 .entry-content h3 { font-size:24px; line-height:1.35; text-transform:none; margin-top:32px; }\n#post-4487 .entry-content ul, #post-4487 .entry-content ol { font-size:20px; line-height:1.7; }\n#post-4487 .entry-content table { font-size:16px; line-height:1.5; }\n#post-4487 .entry-content th { background:#1a1a1a; color:#fff; padding:10px; text-align:left; }\n#post-4487 .entry-content td { padding:10px; border-bottom:1px solid #e5e5e5; }\n@media (max-width:768px) {\n  #post-4487 .entry-content p,\n  #post-4487 .entry-content ul,\n  #post-4487 .entry-content ol { font-size:18px; }\n  #post-4487 .entry-content table { font-size:14px; }\n}\n<\/style>\n<style data-ps-fmt=\"v1\">#post-4487 #page-title-text{width:100%!important}#post-4487 #page-title-text h1{font-family:\"Libre Caslon Text\",Georgia,serif!important;font-weight:700!important;font-size:38px!important;line-height:1.2!important;letter-spacing:0!important;color:#292726!important;margin:0!important;max-width:750px}#post-4487 .entry-content>h2{font-size:32px!important;line-height:1.25!important;font-weight:700!important;color:#292726!important;margin:48px 0 16px!important}#post-4487 .entry-content>h3{font-size:23px!important;line-height:1.35!important;font-weight:700!important;color:#292726!important;margin:32px 0 12px!important}#post-4487 .entry-content>h4{font-family:\"Libre Caslon Text\",Georgia,serif!important;font-size:20px!important;line-height:1.4!important;font-weight:700!important;color:#292726!important;letter-spacing:0!important;text-transform:none!important;margin:26px 0 8px!important}#post-4487 .entry-content>h2:first-child{margin-top:0!important}#post-4487 .entry-content .ps-fmt-tw{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:28px 0}#post-4487 .entry-content .ps-fmt-tw>table{margin:0!important}#post-4487 .entry-content figure>.ps-fmt-tw{margin:0}#post-4487 .entry-content table,#post-4487 .entry-content table th,#post-4487 .entry-content table td{font-size:16px!important;line-height:1.5!important}#post-4487 .entry-content table.ps-fmt-t{width:100%;border-collapse:collapse;border:1px solid #e0e0e0}#post-4487 .entry-content table.ps-fmt-t th{background:#2c2c2c;color:#fff;font-weight:600;text-align:left;padding:12px 16px;vertical-align:middle;border:0}#post-4487 .entry-content table.ps-fmt-t td{padding:10px 16px;border:0;border-bottom:1px solid #e0e0e0;vertical-align:top}#post-4487 .entry-content table.ps-fmt-t tbody tr:nth-child(odd) td{background:#f9f9f9}@media (max-width:768px){#post-4487 #page-title-text h1{font-size:28px!important}#post-4487 .entry-content>h2{font-size:26px!important;margin-top:40px!important}#post-4487 .entry-content>h3{font-size:21px!important;margin-top:28px!important}#post-4487 .entry-content>h4{font-size:19px!important}#post-4487 .entry-content table,#post-4487 .entry-content table th,#post-4487 .entry-content table td{font-size:14px!important}#post-4487 .entry-content table.ps-fmt-t th,#post-4487 .entry-content table.ps-fmt-t td{padding:8px 10px}#post-4487 .entry-content .ps-fmt-tw.w5>table{min-width:600px}#post-4487 .entry-content .ps-fmt-tw.w6>table{min-width:720px}}<\/style>\n<p>At 300 dpi, an A3 poster is 3508 x 4961 pixels, A2 is 4961 x 7016 pixels, and A1 is 7016 x 9933 pixels. Paperlust Print Shop requests 300 dpi at the finished size on every poster, and no lower figure is acceptable.<\/p>\n<div class=\"ps-fmt-tw\">\n<table data-canon=\"snip-conversion\">\n<thead>\n<tr>\n<th>Format<\/th>\n<th>Millimetres<\/th>\n<th>Pixels at 300 dpi<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>A3 at 300 dpi<\/td>\n<td>297 x 420 mm<\/td>\n<td>3508 x 4961 px<\/td>\n<\/tr>\n<tr>\n<td>A2 at 300 dpi<\/td>\n<td>420 x 594 mm<\/td>\n<td>4961 x 7016 px<\/td>\n<\/tr>\n<tr>\n<td>A1 at 300 dpi<\/td>\n<td>594 x 841 mm<\/td>\n<td>7016 x 9933 px<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div style=\"background:#f8f6f3;border-left:4px solid #c9a96e;padding:16px 20px;margin:20px 0;\"><strong>Quick answer<\/strong><\/p>\n<ul style=\"margin:8px 0 0 0;padding-left:20px;\">\n<li>A3 at 300 dpi: 3508 x 4961 px<\/li>\n<li>A2 at 300 dpi: 4961 x 7016 px<\/li>\n<li>A1 at 300 dpi: 7016 x 9933 px<\/li>\n<li><strong>Rule of thumb:<\/strong> 300 dpi at the final print size for every poster, whether it will be read up close or from across the room.<\/li>\n<li>A 12-megapixel phone image only covers A4 at 300 dpi, while a 48-megapixel image reaches A3 and A2. Screenshots never reach poster size.<\/li>\n<\/ul>\n<\/div>\n<div style=\"background:#f8f6f3;border-left:4px solid #c9a96e;padding:18px 22px;margin:24px 0;border-radius:2px;\"><strong>From artwork to printed poster<\/strong><\/p>\n<p>Once your artwork is sized and exported, we print posters in A4 (210 x 297 mm), A3 (297 x 420 mm), A2 (420 x 594 mm), A1 (594 x 841 mm) and A0 (841 x 1189 mm) on 200 gsm Satin Paper or 200 gsm Synthetic, with 170 gsm Gloss Paper and 350 gsm Artboard available in A3 and A2. Quantities are 1, 2, 5, 10, 20, 50 and 100 on satin, gloss and artboard, and 1 to 10 and 20 on synthetic. A2 on 170 gsm Gloss Paper starts at a quantity of 10. The page opens at $21.28 for A4 on 200 gsm Satin Paper. Send the file through <a href=\"https:\/\/printshop.paperlust.co\/products\/posters\">poster printing<\/a> when the dimensions match the space.<\/p>\n<\/div>\n<p>This page covers pixel dimensions, DPI and resolution, so it deals with file setup, not format dimensions. Millimetre measurements and common uses for the five formats are covered on their own pages: <a href=\"https:\/\/printshop.paperlust.co\/blog\/a0-poster-size-australia\">A0 poster size<\/a>, <a href=\"https:\/\/printshop.paperlust.co\/blog\/a1-poster-size-australia\">A1 poster size<\/a>, <a href=\"https:\/\/printshop.paperlust.co\/blog\/a2-poster-size-australia\">A2 poster size<\/a>, <a href=\"https:\/\/printshop.paperlust.co\/blog\/a3-poster-size-australia\">A3 poster size<\/a>, <a href=\"https:\/\/printshop.paperlust.co\/blog\/a4-poster-size-australia\">A4 poster size<\/a>.<\/p>\n<h2>The Full Pixel Table, With Working Shown<\/h2>\n<p>The formula is simple: <strong>pixels = (millimetres \/ 25.4) x DPI<\/strong>. Below are the exact dimensions for the three poster sizes available at Paperlust, with the arithmetic shown so you can verify every number.<\/p>\n<div class=\"ps-fmt-tw\">\n<table>\n<thead>\n<tr>\n<th>Size<\/th>\n<th>Dimensions<\/th>\n<th>At 300 dpi<\/th>\n<th>Working (300 dpi)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>A3<\/td>\n<td>297 x 420 mm<\/td>\n<td><strong>3508 x 4961 px<\/strong><\/td>\n<td>297\/25.4 = 11.69 in; x300 = 3508<\/td>\n<\/tr>\n<tr>\n<td>A2<\/td>\n<td>420 x 594 mm<\/td>\n<td><strong>4961 x 7016 px<\/strong><\/td>\n<td>420\/25.4 = 16.54 in; x300 = 4961<\/td>\n<\/tr>\n<tr>\n<td>A1<\/td>\n<td>594 x 841 mm<\/td>\n<td><strong>7016 x 9933 px<\/strong><\/td>\n<td>594\/25.4 = 23.39 in; x300 = 7016<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>A note on rounding: the ISO A-series dimensions are defined precisely, and the pixel counts above are rounded to the nearest whole number. Your design software may show one pixel more or less depending on how it handles floating-point arithmetic. That difference is negligible in print.<\/p>\n<h2>Why 300 dpi is the resolution for posters at every size<\/h2>\n<p>300 dpi began as the benchmark for documents read at arm&#8217;s length. Posters are often read the same way, at an event stand, on a corridor notice board or in a shop window, where fine type, hairline rules, logos and QR codes sit close to the eye. Because of that, Paperlust Print Shop asks for 300 dpi at the final print size for A4, A3, A2, A1 and A0 as well.<\/p>\n<p>Your eye does resolve less fine detail as you step back from a poster. That is a fact about viewing distance, not a reason to lower the file resolution. The same poster that is seen from across a room can also be inspected up close.<\/p>\n<p>A 300 dpi A1 file is 7016 x 9933 pixels, so it is a large file. Two habits keep that workable. Keep text, logos, shapes and line art as vector elements in your PDF, AI, EPS or SVG; they are not made of pixels and stay crisp at any scale. Or build the document at a reduced scale when your design software slows down on a very large canvas. At 50% of the finished size, use 600 dpi; at 25%, use 1200 dpi. This keeps the total pixel count the same as a full-size 300 dpi file.<\/p>\n<p>If you are comparing the standard formats before you finish your file, see our guide to <a href=\"https:\/\/printshop.paperlust.co\/blog\/poster-sizes-australia\">poster sizes in Australia<\/a>.<\/p>\n<figure class=\"wp-block-image ps-blog-img\" style=\"margin:32px auto;text-align:center;max-width:100%;\"><img decoding=\"async\" src=\"https:\/\/printshop.paperlust.co\/blog\/wp-content\/uploads\/2026\/08\/poster-size-in-pixels-and-dpi-inl1.jpg\" alt=\"A1 poster \u00b7 200gsm synthetic stock \u00b7 tear-resistant and water-resistant \u00b7 wall display showing sharp typographic detail\" data-no-lazy=\"1\" style=\"max-width:100%;height:auto;border-radius:4px;\" \/><figcaption class=\"wp-element-caption\" style=\"font-size:0.85em;line-height:1.45;color:#666;margin-top:8px;text-align:center;\">A1 poster \u00b7 200 gsm Synthetic stock \u00b7 tear-resistant and moisture-resistant \u00b7 wall display showing sharp typographic detail<\/figcaption><\/figure>\n<h2>How to Check the File You Already Have<\/h2>\n<p>This is the step most guides skip entirely. Before uploading, take two minutes to confirm your image meets the resolution needed.<\/p>\n<h3>On Windows<\/h3>\n<ol>\n<li>Open File Explorer and locate the image file.<\/li>\n<li>Right-click the file and choose <strong>Properties<\/strong>.<\/li>\n<li>Click the <strong>Details<\/strong> tab.<\/li>\n<li>Look for &#8220;Horizontal resolution&#8221; and &#8220;Vertical resolution&#8221; in the list. These show the DPI embedded in the file.<\/li>\n<li>Also note the &#8220;Width&#8221; and &#8220;Height&#8221; values in pixels.<\/li>\n<\/ol>\n<p>If the Details tab does not show DPI (some formats do not store it), calculate it yourself: divide the pixel width by the poster width in inches. For an image that is 2800 pixels wide being printed on A3 (11.69 inches wide), the effective DPI is 2800 \/ 11.69 = 239 dpi.<\/p>\n<h3>On Mac<\/h3>\n<ol>\n<li>Open the image in <strong>Preview<\/strong> by double-clicking it.<\/li>\n<li>Go to <strong>Tools &gt; Show Inspector<\/strong> (or press Command + I).<\/li>\n<li>Click the <strong>More Info<\/strong> tab (the circled &#8220;i&#8221; icon).<\/li>\n<li>The panel shows pixel dimensions and resolution in dpi.<\/li>\n<\/ol>\n<p>Alternatively, right-click the file in Finder and choose <strong>Get Info<\/strong>. The More Info section shows dimensions in pixels. Use the division formula above to calculate the effective DPI.<\/p>\n<h3>Quick mental check<\/h3>\n<p>Phone shots from a 12-megapixel sensor typically produce files around 3024 by 4032 pixels. Divide those figures by 300 dpi and you get an A4 print, but not an A3, which needs 3508 x 4961 pixels. A 48-megapixel phone file of about 6048 x 8064 pixels covers A3 and A2 at 300 dpi, though it cannot reach A1. The check is to divide the pixel dimensions by the print size. The same arithmetic applies when <a href=\"https:\/\/printshop.paperlust.co\/products\/canvas-prints\">printing photos on canvas<\/a>. At 150 dpi a 60x90cm canvas needs about 3543 x 5315 pixels, so the same 12-megapixel file covers the smaller canvas sizes comfortably.<\/p>\n<p>Screenshots are the common trap. A full HD screenshot on a 1080p display is 1920 x 1080 pixels. Stretched to A3 in portrait orientation, the effective resolution drops to about 165 dpi wide and 93 dpi tall. The result will look soft, particularly with small text. A 4K or retina screenshot fares better, but it is still not a reliable source for A2 or A1. Knowing how this format behaves in practice is one thing; our <a href=\"https:\/\/printshop.paperlust.co\/blog\/a2-poster-size-australia\">A2 poster size<\/a> guide steps through the situations where it is the right choice.<\/p>\n<figure class=\"wp-block-image ps-blog-img\" style=\"margin:32px auto;text-align:center;max-width:100%;\"><img decoding=\"async\" src=\"https:\/\/printshop.paperlust.co\/blog\/wp-content\/uploads\/2026\/08\/poster-size-in-pixels-and-dpi-inl2.jpg\" alt=\"Diagram: A3 samples in close-up, comparing text sharpness at adequate and insufficient pixel resolution\" data-no-lazy=\"1\" style=\"max-width:100%;height:auto;border-radius:4px;\" \/><figcaption class=\"wp-element-caption\" style=\"font-size:0.85em;line-height:1.45;color:#666;margin-top:8px;text-align:center;\">Diagram: A3 samples in close-up, comparing text sharpness at adequate and insufficient pixel resolution<\/figcaption><\/figure>\n<h2>What Happens When You Upscale<\/h2>\n<p>If your image is short on pixels, software can add them. Modern AI-based upscaling tools (including features inside Photoshop, Lightroom, and several dedicated apps) do a credible job on the right kind of image.<\/p>\n<p>What AI upscaling handles well: smooth gradients, clean backgrounds, and natural photographic detail. A landscape photo at 2400 x 1600 pixels can often be doubled without obvious artefacts.<\/p>\n<p>What it does not fix reliably: text rendered at low resolution picks up jagged edges that AI tends to smooth into a blur rather than sharpen. JPEG-compressed screenshots have artefacts that compound on upscaling. Fine line art with hairline strokes can come out looking muddy.<\/p>\n<p>The practical test: if the image came from a phone camera or a quality digital camera, try upscaling. If it is a downloaded logo, a screenshot, or a scan of a printed page, ask for the original high-resolution file instead. Upscaling a bad source rarely produces a good print.<\/p>\n<h2>Vector Files: When Resolution Stops Mattering<\/h2>\n<p>If the artwork consists entirely of text, shapes, and icons, resolution is not a concern. Vector formats (AI, EPS, SVG, and print-ready PDF) store shapes as mathematical curves rather than pixels. They reproduce with identical sharpness at any print size and any dpi setting.<\/p>\n<p>A PDF exported from Illustrator or InDesign is resolution-independent for its vector elements. Any photographs or raster images placed inside the file still carry their original resolution, so those embedded images still need to meet the minimums in the table above.<\/p>\n<p>For a text-and-logo poster, supply a PDF with fonts outlined or embedded. For a photographic poster, a high-resolution TIFF or flattened PDF at the correct dimensions is the appropriate format.<\/p>\n<figure class=\"wp-block-image ps-blog-img\" style=\"margin:32px auto;text-align:center;max-width:100%;\"><img decoding=\"async\" src=\"https:\/\/printshop.paperlust.co\/blog\/wp-content\/uploads\/2026\/08\/poster-size-in-pixels-and-dpi-inl3.jpg\" alt=\"Diagram: A2 vector artwork showing bold typographic letterforms crisp and pixelation-free, resolution-independent\" data-no-lazy=\"1\" style=\"max-width:100%;height:auto;border-radius:4px;\" \/><figcaption class=\"wp-element-caption\" style=\"font-size:0.85em;line-height:1.45;color:#666;margin-top:8px;text-align:center;\">Diagram: A2 vector artwork showing bold typographic letterforms crisp and pixelation-free, resolution-independent<\/figcaption><\/figure>\n<h2>Colour Mode, Bleed and File Setup<\/h2>\n<p>Two technical settings catch designers out when sending files to a commercial printer.<\/p>\n<p><strong>Colour mode.<\/strong> Print presses use CMYK inks. Screens display in RGB. The conversion shifts colours: vivid neons, saturated reds, and bright blues often look duller on paper than on screen. If your design software supports CMYK output (Illustrator, InDesign, Photoshop), set the colour profile to CMYK before designing. Browser-based tools like Canva handle the conversion automatically, but expect some colour shift on highly saturated tones.<\/p>\n<p><strong>Bleed.<\/strong> A bleed of 10 mm on each side is standard. Bleed means the design extends beyond the final cut line so that trimming does not leave a white sliver at the edge. If the background or a photo runs to the edge of the poster, extend it 10 mm past the trim. For A3, the canvas becomes 317 x 440 mm instead of 297 x 420 mm. For A2, it becomes 440 x 614 mm. For A1, 614 x 861 mm.<\/p>\n<p>Our posters are printed on 200 gsm Satin Paper or 200 gsm Synthetic in A4 to A0, and on 170 gsm Gloss Paper or 350 gsm Artboard in A3 and A2. 200 gsm Synthetic is tear-resistant and moisture-resistant, while satin, gloss and artboard are paper stocks for indoor display. Full artwork setup requirements, including file format guidelines and a template, are available on the <a href=\"https:\/\/printshop.paperlust.co\/products\/posters\">custom poster printing page<\/a>.<\/p>\n<p>For larger display needs beyond A0 (trade show walls, outdoor signage, building fascias), the <a href=\"https:\/\/printshop.paperlust.co\/categories\/signage-panels\">plastic sign printing<\/a> range covers corflute, PVC, and construction-grade formats at sizes well above the A-series. Artwork is supplied the same way as a poster file with 10mm bleed, and <a href=\"https:\/\/printshop.paperlust.co\/products\/corflute-plastic-signs\">corflute sign printing<\/a> takes that file directly at 600 x 450mm, 600 x 900mm and 900 x 1200mm, while <a href=\"https:\/\/printshop.paperlust.co\/products\/pvc-signs\">PVC signs<\/a> print A3, A2 and A1 from the same file.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<h3>What size in pixels is an A3 poster at 300 dpi?<\/h3>\n<p>An A3 poster at 300 dpi is 3508 x 4961 pixels. A3 measures 297 x 420 mm, which converts to 11.69 x 16.54 inches. Multiply each by 300 to get the pixel dimensions. Once you have those pixel dimensions sorted, our guide to <a href=\"https:\/\/printshop.paperlust.co\/blog\/a3-poster-size-australia\">A3 poster size<\/a> covers the jobs the format handles best.<\/p>\n<h3>What size in pixels is an A2 poster at 300 dpi?<\/h3>\n<p>An A2 poster at 300 dpi is 4961 x 7016 pixels. A2 measures 420 x 594 mm (16.54 x 23.39 inches).<\/p>\n<h3>What size in pixels is an A1 poster at 300 dpi?<\/h3>\n<p>An A1 poster at 300 dpi is 7016 x 9933 pixels. A1 measures 594 x 841 mm (23.39 x 33.11 inches).<\/p>\n<h3>Is 150 dpi good enough for a poster?<\/h3>\n<p>No. Paperlust Print Shop requires 300 dpi at the final print size for every poster, from A4 to A0, and wherever it will hang. At 300 dpi an A1 is 7016 x 9933 pixels and an A2 is 4961 x 7016 pixels. A file prepared at 150 dpi supplies only half the pixels in each direction. Before your poster goes to print, we review the artwork and contact you if a higher resolution file is needed.<\/p>\n<h3>What is the minimum resolution for A1 poster printing?<\/h3>\n<p>The minimum resolution for an A1 poster printed by Paperlust Print Shop is 300 dpi at the final print size. A full A1 at 300 dpi is 7016 x 9933 pixels. Vector text and logos have no pixels, so they print sharp at any size. If your software struggles with a document that large, build it at 50% scale at 600 dpi or 25% scale at 1200 dpi.<\/p>\n<h3>My image says 72 dpi. Can I still print it as a poster?<\/h3>\n<p>The DPI label embedded in a file is not always meaningful. What matters is total pixel count. An image saved at 72 dpi might still have enough pixels for a sharp print. Divide the pixel width by the print width in inches. If the result is 150 or above, it will print well at poster size.<\/p>\n<h3>Can I print a screenshot as an A3 poster?<\/h3>\n<p>A 1080p screenshot is 1920 x 1080 pixels. Printed at A3 in portrait, the effective resolution is about 165 dpi on the wide axis and 93 dpi on the tall axis. The result is likely to look soft, especially where there is small text. A retina or 4K screenshot fares better but is still not reliable for A2 or A1.<\/p>\n<h3>What file format should I send for poster printing?<\/h3>\n<p>PDF is the most reliable format for commercial printing. It preserves colour profiles, embeds fonts, and handles vector and raster content cleanly. High-resolution TIFF is a good alternative for photographic work. Avoid JPEG for artwork with text or fine lines, as JPEG compression artefacts can become visible in print.<\/p>\n<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What size in pixels is an A3 poster at 300 dpi?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"An A3 poster at 300 dpi is 3508 x 4961 pixels. A3 measures 297 x 420 mm, which converts to 11.69 x 16.54 inches. Multiply each by 300 to get the pixel dimensions.\"}}, {\"@type\": \"Question\", \"name\": \"What size in pixels is an A2 poster at 300 dpi?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"An A2 poster at 300 dpi is 4961 x 7016 pixels. 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