{"id":5146,"date":"2026-06-18T13:57:49","date_gmt":"2026-06-18T13:57:49","guid":{"rendered":"https:\/\/rimanagency.com\/image-resizer-resize-images-to-exact-dimensions-online-pixel-perfect\/"},"modified":"2026-06-18T15:46:43","modified_gmt":"2026-06-18T15:46:43","slug":"image-resizer-resize-images-to-exact-dimensions-online-pixel-perfect","status":"publish","type":"page","link":"https:\/\/rimanagency.com\/fr\/image-resizer-resize-images-to-exact-dimensions-online-pixel-perfect\/","title":{"rendered":"Image Resizer \u2014 Redimensionnez vos images en ligne \u00e0 des dimensions exactes (pr\u00e9cision pixel parfaite)"},"content":{"rendered":"\n<style>.rt-h{background:linear-gradient(135deg,#f1f5e8,#e8efdb);border-radius:14px;padding:32px;margin:0 0 24px;text-align:center}.rt-h h1{margin:0 0 10px;font-size:28px;color:#4a6320}.rt-tool{background:#fff;border:1px solid #e0e6d8;border-radius:12px;padding:22px;margin:0 0 24px}.rt-tool h3{margin:0 0 14px;color:#4a6320;font-size:18px}.rt-drop{display:block;border:2px dashed #d4dac6;border-radius:10px;padding:32px 20px;text-align:center;background:#fafafa;cursor:pointer;transition:all .2s;position:relative}.rt-drop:hover,.rt-drop.hover{border-color:#719430;background:#f1f5e8}.rt-drop .rt-drop-main{display:block;margin:0 0 6px;font-size:15px;color:#516048}.rt-drop .rt-drop-sub{display:block;font-size:12px;color:#888}.rt-drop input[type=file]{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}.rt-btn{background:#719430;color:#fff;border:none;padding:10px 18px;border-radius:6px;font-weight:700;cursor:pointer;font-size:14px}.rt-btn:hover{background:#4a6320}.rt-ctrl{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin:14px 0}.rt-ctrl label{display:block;font-size:12px;color:#516048;font-weight:600;margin-bottom:4px}.rt-ctrl input,.rt-ctrl select{width:100%;padding:8px;border:1px solid #d4dac6;border-radius:6px;font-size:13px;box-sizing:border-box}.rt-result{margin-top:14px}.rt-cta{background:linear-gradient(135deg,#719430,#4a6320);color:#fff;border-radius:14px;padding:32px;text-align:center;margin:30px 0}.rt-cta h3{margin:0 0 6px;color:#fff}.rt-cta a{background:#fff;color:#4a6320;padding:12px 28px;border-radius:6px;font-weight:700;text-decoration:none;display:inline-block;margin-top:14px}<\/style>\r\n<div class=\"rt-h\">\r\n<h1>Image Resizer<\/h1>\r\nResize JPG, PNG, and WebP images to exact pixel dimensions in your browser \u2014 by exact size, by percentage, or by maximum dimension while preserving aspect ratio. No upload, instant download.\r\n\r\n<\/div>\r\n<div class=\"rt-tool\">\r\n<h3>Upload an image<\/h3>\r\n<div id=\"ir-drop\" class=\"rt-drop\"><span class=\"rt-drop-main\"><b>Click to upload or drag an image here<\/b><\/span><span class=\"rt-drop-sub\">JPG, PNG, WebP \u2014 runs locally<\/span><input id=\"ir-file\" accept=\"image\/*\" type=\"file\" \/><\/div>\r\n<div id=\"ir-orig\" style=\"font-size: 13px; color: #516048; margin: 10px 0; display: none;\"><\/div>\r\n<div class=\"rt-ctrl\">\r\n<div><label>Mode<\/label><select id=\"ir-mode\">\r\n<option value=\"exact\">Exact dimensions<\/option>\r\n<option value=\"percent\">Resize by percentage<\/option>\r\n<option value=\"maxwidth\">Max width (preserve aspect)<\/option>\r\n<option value=\"maxheight\">Max height (preserve aspect)<\/option>\r\n<\/select><\/div>\r\n<div><label>Width (px)<\/label><input id=\"ir-w\" type=\"number\" value=\"800\" \/><\/div>\r\n<div><label>Height (px)<\/label><input id=\"ir-h\" type=\"number\" value=\"600\" \/><\/div>\r\n<div><label>Percentage (%)<\/label><input id=\"ir-pct\" type=\"number\" value=\"50\" \/><\/div>\r\n<\/div>\r\n<div class=\"rt-ctrl\">\r\n<div><label>Output format<\/label><select id=\"ir-format\">\r\n<option value=\"jpeg\">JPEG<\/option>\r\n<option value=\"png\">PNG<\/option>\r\n<option value=\"webp\">WebP<\/option>\r\n<\/select><\/div>\r\n<div><label>Quality (1-100)<\/label><input id=\"ir-quality\" max=\"100\" min=\"1\" type=\"number\" value=\"90\" \/><\/div>\r\n<\/div>\r\n<button id=\"ir-go\" class=\"rt-btn\" style=\"width: 100%; margin-top: 10px;\">Resize Image<\/button>\r\n<div id=\"ir-result\" class=\"rt-result\"><\/div>\r\n<\/div>\r\n<script>(function(){var drop=document.getElementById('ir-drop'),file=document.getElementById('ir-file');drop.addEventListener('click',function(e){if(e.target.tagName!=='INPUT')file.click();});['dragover','dragenter'].forEach(function(e){drop.addEventListener(e,function(ev){ev.preventDefault();drop.classList.add('hover');});});['dragleave','drop'].forEach(function(e){drop.addEventListener(e,function(){drop.classList.remove('hover');});});drop.addEventListener('drop',function(e){e.preventDefault();if(e.dataTransfer.files[0])handleFile(e.dataTransfer.files[0]);});file.addEventListener('change',function(e){if(e.target.files[0])handleFile(e.target.files[0]);});function fmtSize(b){if(b===0)return '0 B';var i=Math.floor(Math.log(b)\/Math.log(1024));var u=['B','KB','MB','GB'];return (b\/Math.pow(1024,i)).toFixed(1)+' '+u[i];}function mkDiv(c){var d=document.createElement('div');d.style.cssText=c;return d;}var orig=null;function handleFile(f){var r=new FileReader();r.onload=function(ev){var img=new Image();img.onload=function(){orig=img;var ow=document.getElementById('ir-orig');ow.style.display='block';ow.textContent='Original: '+orig.width+' x '+orig.height+' px';document.getElementById('ir-w').value=Math.round(orig.width\/2);document.getElementById('ir-h').value=Math.round(orig.height\/2);};img.src=ev.target.result;};r.readAsDataURL(f);}document.getElementById('ir-go').addEventListener('click',function(){if(!orig){alert('Please upload an image first');return;}var mode=document.getElementById('ir-mode').value;var w=parseInt(document.getElementById('ir-w').value)||orig.width;var h=parseInt(document.getElementById('ir-h').value)||orig.height;var pct=parseInt(document.getElementById('ir-pct').value)||50;var newW,newH;if(mode==='exact'){newW=w;newH=h;}else if(mode==='percent'){newW=Math.round(orig.width*pct\/100);newH=Math.round(orig.height*pct\/100);}else if(mode==='maxwidth'){newW=Math.min(orig.width,w);newH=Math.round(newW*orig.height\/orig.width);}else{newH=Math.min(orig.height,h);newW=Math.round(newH*orig.width\/orig.height);}var canvas=document.createElement('canvas');canvas.width=newW;canvas.height=newH;var ctx=canvas.getContext('2d');ctx.imageSmoothingEnabled=true;ctx.imageSmoothingQuality='high';ctx.drawImage(orig,0,0,newW,newH);var format=document.getElementById('ir-format').value;var q=parseInt(document.getElementById('ir-quality').value)\/100;canvas.toBlob(function(blob){var url=URL.createObjectURL(blob);var result=document.getElementById('ir-result');result.textContent='';var info=mkDiv('background:#f1f5e8;border:1px solid #c4d49e;border-radius:8px;padding:14px;margin-top:14px');info.textContent='Resized: '+newW+' x '+newH+' px - '+fmtSize(blob.size);result.appendChild(info);var dl=mkDiv('text-align:center;margin-top:14px');var a=document.createElement('a');a.href=url;a.download='resized.'+format;a.textContent='Download Resized Image';a.style.cssText='background:#719430;color:#fff;padding:10px 18px;border-radius:6px;font-weight:700;text-decoration:none;display:inline-block';dl.appendChild(a);result.appendChild(dl);var prev=mkDiv('margin-top:14px;text-align:center');var img=document.createElement('img');img.src=url;img.style.cssText='max-width:100%;max-height:340px;border:1px solid #e0e6d8;border-radius:8px';prev.appendChild(img);result.appendChild(prev);},'image\/'+format,q);});})();<\/script>\r\n<h2>How to use the Image Resizer<\/h2>\r\nUpload an image. Choose a resize mode. Pick output format and quality. Click Resize.\r\n<h2>Why this tool matters<\/h2>\r\nResizing before upload cuts page weight 10-30\u00d7 and improves Core Web Vitals.\r\n<h2>Common use cases<\/h2>\r\n<ul>\r\n \t<li>Blog post headers<\/li>\r\n \t<li>Product thumbnails<\/li>\r\n \t<li>Responsive design sizes<\/li>\r\n \t<li>Documentation screenshots<\/li>\r\n \t<li>Email signature images<\/li>\r\n \t<li>Social media crops<\/li>\r\n<\/ul>\r\n<h2>Aspect ratio: preserve vs distort<\/h2>\r\nExact mode lets you distort. Max width\/Max height modes preserve aspect ratio. Percentage mode preserves aspect ratio automatically.\r\n<h2>Frequently Asked Questions<\/h2>\r\n<strong>Will quality be acceptable?<\/strong>\r\nBrowsers use high-quality bicubic resampling \u2014 visually indistinguishable from desktop software.\r\n\r\n<strong>Can I upscale?<\/strong>\r\nYes but blurry. AI upscaling needed for real enlargement.\r\n\r\n<strong>Max size?<\/strong>\r\nLimited by browser memory. Handles 100-megapixel images.\r\n\r\n<strong>Transparent PNGs?<\/strong>\r\nPreserved. JPEG output makes transparency white.\r\n<div class=\"rt-cta\">\r\n<h3>Need pixel-perfect content production?<\/h3>\r\n<p style=\"margin: 0; opacity: .95;\">Riman Agency builds content systems with rigorous image standards.<\/p>\r\n<a href=\"\/contact\/\">Talk to Content Ops<\/a>\r\n\r\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Image Resizer Resize JPG, PNG, and WebP images to exact pixel dimensions in your browser \u2014 by exact size, by percentage, or by maximum dimension while preserving aspect ratio. No upload, instant download. Upload an image Click to upload or drag an image hereJPG, PNG, WebP \u2014 runs locally ModeExact dimensionsResize by percentageMax width (preserve [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-5146","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Image Resizer \u2014 Resize Images to Exact Dimensions Online (Pixel-Perfect) - Riman Agency<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rimanagency.com\/fr\/image-resizer-resize-images-to-exact-dimensions-online-pixel-perfect\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Image Resizer \u2014 Resize Images to Exact Dimensions Online (Pixel-Perfect) - Riman Agency\" \/>\n<meta property=\"og:description\" content=\"Image Resizer Resize JPG, PNG, and WebP images to exact pixel dimensions in your browser \u2014 by exact size, by percentage, or by maximum dimension while preserving aspect ratio. 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