{"id":13104,"date":"2026-03-23T15:00:51","date_gmt":"2026-03-23T06:00:51","guid":{"rendered":"https:\/\/rakkoserver.com\/plus\/?p=13104"},"modified":"2026-03-23T15:00:51","modified_gmt":"2026-03-23T06:00:51","slug":"tool-aspect-ratio-calculator","status":"publish","type":"post","link":"https:\/\/rakkokeyword.com\/techo\/tool-aspect-ratio-calculator\/","title":{"rendered":"\u30a2\u30b9\u30da\u30af\u30c8\u6bd4\u8a08\u7b97\u30c4\u30fc\u30eb"},"content":{"rendered":"\n<div id=\"arc-tool-container\" style=\"width: 100%; color: #333; font-family: sans-serif; line-height: 1.6; max-width: 720px; margin: 0 auto 60px;\">\n    <style>\n        #arc-tool-container * { box-sizing: border-box; }\n        \n        \/* \u5165\u529b\u30a8\u30ea\u30a2 *\/\n        .arc-input-section { display: flex; align-items: flex-start; gap: 8px; margin-bottom: 20px; flex-wrap: nowrap; }\n        .arc-input-group { flex: 1; min-width: 0; display: flex; flex-direction: column; }\n        \n        \/* \u30e9\u30d9\u30eb\u306e\u30b9\u30bf\u30a4\u30eb\u3092\u7d71\u4e00 *\/\n        .arc-input-group p { margin: 0 0 5px 0; font-size: 13px; font-weight: bold; white-space: nowrap; line-height: 1.2; }\n        .arc-label-hidden { visibility: hidden; }\n\n        .arc-input-field { width: 100%; height: 45px; border: 1px solid #ccc; padding: 0 8px; font-size: 16px; inputmode: decimal; outline: none; -webkit-appearance: none; border-radius: 0; }\n        .arc-input-field:focus { border-color: #13284B; }\n        \n        \/* \u64cd\u4f5c\u30dc\u30bf\u30f3 *\/\n        .arc-swap-btn { background: #f0f0f0; border: 1px solid #ccc; width: 40px; height: 45px; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0; }\n        .arc-lock-btn { background: #f0f0f0; border: 1px solid #ccc; width: 100%; height: 45px; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 16px; transition: all 0.2s; }\n        .arc-lock-btn.is-active { background: #13284B; color: #fff; border-color: #13284B; }\n        .arc-lock-icon { margin-right: 4px; font-size: 14px; }\n\n        .arc-preset-group { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 25px; }\n        .arc-btn { height: 36px; padding: 0 12px; border: none; border-radius: 0; cursor: pointer; font-size: 13px; transition: all 0.2s; display: inline-flex; align-items: center; justify-content: center; }\n        .arc-btn-primary { background-color: #13284B; color: #fff; }\n        .arc-btn-outline { background-color: #fff; border: 1px solid #13284B; color: #13284B; }\n        .arc-btn-success { background-color: #28a745 !important; color: #fff !important; border-color: #28a745 !important; }\n        .arc-btn:hover { opacity: 0.8; }\n\n        \/* \u30d7\u30ec\u30d3\u30e5\u30fc\u30a8\u30ea\u30a2 *\/\n        .arc-preview-area { width: 100%; height: 180px; background: #f5f5f5; display: flex; align-items: center; justify-content: center; margin-bottom: 25px; padding: 10px; }\n        .arc-preview-container { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; }\n        #arc-preview-box { background: #13284B; transition: all 0.2s ease-out; width: 0; height: 0; }\n\n        \/* \u7d50\u679c\u8868\u793a\u30a8\u30ea\u30a2 *\/\n        .arc-result-container { border-top: 2px solid #13284B; padding-top: 20px; text-align: center; }\n        .arc-ratio-label { font-size: 13px; color: #666; margin-bottom: 5px; }\n        .arc-ratio-value { font-size: 42px; font-weight: bold; color: #000; line-height: 1.2; margin-bottom: 15px; }\n        \n        .arc-copy-wrapper { display: flex; align-items: center; background: #eee; padding: 8px; margin-bottom: 20px; justify-content: space-between; gap: 10px; }\n        .arc-code-text { font-family: monospace; font-size: 13px; font-weight: bold; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }\n\n        .arc-table { width: 100%; border-collapse: collapse; margin-top: 10px; font-size: 12px; }\n        .arc-table th, .arc-table td { border: 1px solid #ddd; padding: 10px 8px; text-align: left; }\n        .arc-table th { background: #f5f5f5; font-weight: bold; }\n        \n        @media (max-width: 480px) {\n            #arc-tool-container { margin-bottom: 40px; }\n            .arc-input-section { gap: 5px; }\n            .arc-swap-btn { width: 32px; font-size: 16px; }\n            .arc-ratio-value { font-size: 32px; }\n            .arc-lock-btn { font-size: 14px; padding: 0; }\n            .arc-lock-icon { margin-right: 2px; }\n        }\n    <\/style>\n\n    <div class=\"arc-input-section\">\n        <div class=\"arc-input-group\">\n            <p>\u5e45 (Width)<\/p>\n            <input type=\"text\" id=\"arc-width\" class=\"arc-input-field\" value=\"1920\" inputmode=\"decimal\">\n        <\/div>\n        \n        <div class=\"arc-input-group\" style=\"flex: 0; min-width: 40px;\">\n            <p class=\"arc-label-hidden\">\u5165\u66ff<\/p>\n            <button id=\"arc-swap\" class=\"arc-swap-btn\" title=\"\u7e26\u6a2a\u3092\u5165\u308c\u66ff\u3048\">\u21c4<\/button>\n        <\/div>\n\n        <div class=\"arc-input-group\">\n            <p>\u9ad8\u3055 (Height)<\/p>\n            <input type=\"text\" id=\"arc-height\" class=\"arc-input-field\" value=\"1080\" inputmode=\"decimal\">\n        <\/div>\n\n        <div class=\"arc-input-group\" style=\"flex: 0.6; min-width: 65px;\">\n            <p>\u56fa\u5b9a<\/p>\n            <button id=\"arc-lock\" class=\"arc-lock-btn\" title=\"\u6bd4\u7387\u3092\u56fa\u5b9a\">\n                <span id=\"arc-lock-icon\" class=\"arc-lock-icon\">\ud83d\udd13<\/span>\n            <\/button>\n        <\/div>\n    <\/div>\n\n    <div class=\"arc-preset-group\">\n        <button class=\"arc-btn arc-btn-outline\" onclick=\"arcSetPreset(16, 9)\">16:9<\/button>\n        <button class=\"arc-btn arc-btn-outline\" onclick=\"arcSetPreset(4, 3)\">4:3<\/button>\n        <button class=\"arc-btn arc-btn-outline\" onclick=\"arcSetPreset(1, 1)\">1:1<\/button>\n        <button class=\"arc-btn arc-btn-outline\" onclick=\"arcSetPreset(1, 1.618)\">\u9ec4\u91d1\u6bd4<\/button>\n        <button class=\"arc-btn arc-btn-outline\" onclick=\"arcSetPreset(1, 1.414)\">\u767d\u9280\u6bd4<\/button>\n    <\/div>\n\n    <div class=\"arc-preview-area\">\n        <div class=\"arc-preview-container\" id=\"arc-preview-container\">\n            <div id=\"arc-preview-box\"><\/div>\n        <\/div>\n    <\/div>\n\n    <div class=\"arc-result-container\">\n        <p class=\"arc-ratio-label\">\u8a08\u7b97\u3055\u308c\u305f\u30a2\u30b9\u30da\u30af\u30c8\u6bd4<\/p>\n        <div id=\"arc-result-ratio\" class=\"arc-ratio-value\">16 : 9<\/div>\n        \n        <div class=\"arc-copy-wrapper\">\n            <span id=\"arc-css-output\" class=\"arc-code-text\">aspect-ratio: 16 \/ 9;<\/span>\n            <button id=\"arc-copy-btn\" class=\"arc-btn arc-btn-primary\" style=\"flex-shrink: 0;\" onclick=\"arcCopyText('arc-css-output')\">CSS\u30b3\u30d4\u30fc<\/button>\n        <\/div>\n    <\/div>\n\n    <p style=\"font-size: 14px; font-weight: bold; margin: 25px 0 10px;\">\u4e3b\u8981\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306e\u63a8\u5968\u30b5\u30a4\u30ba<\/p>\n    <table class=\"arc-table\">\n        <thead>\n            <tr><th>\u7528\u9014<\/th><th>\u30b5\u30a4\u30ba<\/th><th>\u6bd4\u7387<\/th><\/tr>\n        <\/thead>\n        <tbody>\n            <tr><td>YouTube<\/td><td>1920\u00d71080<\/td><td>16:9<\/td><\/tr>\n            <tr><td>Instagram<\/td><td>1080\u00d71350<\/td><td>4:5<\/td><\/tr>\n            <tr><td>Stories<\/td><td>1080\u00d71920<\/td><td>9:16<\/td><\/tr>\n            <tr><td>LINE\u30b9\u30bf\u30f3\u30d7<\/td><td>320\u00d7270<\/td><td>\u7d041.18:1<\/td><\/tr>\n        <\/tbody>\n    <\/table>\n\n    <script>\n        document.addEventListener('DOMContentLoaded', () => {\n            const wInput = document.getElementById('arc-width');\n            const hInput = document.getElementById('arc-height');\n            const swapBtn = document.getElementById('arc-swap');\n            const lockBtn = document.getElementById('arc-lock');\n            const ratioDisplay = document.getElementById('arc-result-ratio');\n            const cssDisplay = document.getElementById('arc-css-output');\n            const previewBox = document.getElementById('arc-preview-box');\n            const previewContainer = document.getElementById('arc-preview-container');\n            const copyBtn = document.getElementById('arc-copy-btn');\n            \n            let isLocked = false;\n            let lockedRatio = 16 \/ 9;\n\n            function sanitize(val) {\n                if (typeof val !== 'string') val = String(val);\n                let s = val.replace(\/[\uff10-\uff19]\/g, (m) => String.fromCharCode(m.charCodeAt(0) - 0xFEE0));\n                return s.replace(\/[^0-9.]\/g, '');\n            }\n\n            function getGCD(a, b) {\n                let x = Math.round(parseFloat(a) * 1000);\n                let y = Math.round(parseFloat(b) * 1000);\n                while (y) { x %= y; [x, y] = [y, x]; }\n                return x \/ 1000;\n            }\n\n            function update(source) {\n                let w = parseFloat(sanitize(wInput.value)) || 0;\n                let h = parseFloat(sanitize(hInput.value)) || 0;\n\n                if (isLocked && source) {\n                    if (source === 'width' && w > 0) {\n                        h = Math.round((w \/ lockedRatio) * 100) \/ 100;\n                        hInput.value = h;\n                    } else if (source === 'height' && h > 0) {\n                        w = Math.round((h * lockedRatio) * 100) \/ 100;\n                        wInput.value = w;\n                    }\n                }\n\n                if (w <= 0 || h <= 0) {\n                    previewBox.style.width = '0'; previewBox.style.height = '0';\n                    return;\n                }\n\n                const common = getGCD(w, h);\n                let rw = Math.round((w \/ common) * 100) \/ 100;\n                let rh = Math.round((h \/ common) * 100) \/ 100;\n\n                ratioDisplay.textContent = rw + ' : ' + rh;\n                cssDisplay.textContent = 'aspect-ratio: ' + rw + ' \/ ' + rh + ';';\n                \n                const maxWidth = previewContainer.offsetWidth;\n                const maxHeight = previewContainer.offsetHeight;\n                const containerRatio = maxWidth \/ maxHeight;\n                const currentRatio = w \/ h;\n\n                if (currentRatio > containerRatio) {\n                    previewBox.style.width = maxWidth + 'px';\n                    previewBox.style.height = Math.floor(maxWidth \/ currentRatio) + 'px';\n                } else {\n                    previewBox.style.height = maxHeight + 'px';\n                    previewBox.style.width = Math.floor(maxHeight * currentRatio) + 'px';\n                }\n            }\n\n            wInput.addEventListener('input', (e) => {\n                const start = e.target.selectionStart;\n                wInput.value = sanitize(e.target.value);\n                e.target.setSelectionRange(start, start);\n                update('width');\n            });\n\n            hInput.addEventListener('input', (e) => {\n                const start = e.target.selectionStart;\n                hInput.value = sanitize(e.target.value);\n                e.target.setSelectionRange(start, start);\n                update('height');\n            });\n\n            swapBtn.addEventListener('click', () => {\n                const tempW = wInput.value;\n                wInput.value = hInput.value;\n                hInput.value = tempW;\n                if (isLocked) lockedRatio = (parseFloat(wInput.value) || 1) \/ (parseFloat(hInput.value) || 1);\n                update();\n            });\n\n            lockBtn.addEventListener('click', () => {\n                isLocked = !isLocked;\n                lockBtn.classList.toggle('is-active', isLocked);\n                document.getElementById('arc-lock-icon').textContent = isLocked ? '\ud83d\udd12' : '\ud83d\udd13';\n                if (isLocked) lockedRatio = (parseFloat(wInput.value) || 1) \/ (parseFloat(hInput.value) || 1);\n            });\n\n            window.arcSetPreset = (w, h) => {\n                wInput.value = w; hInput.value = h;\n                if (isLocked) lockedRatio = w \/ h;\n                update();\n            };\n\n            window.arcCopyText = (id) => {\n                const text = document.getElementById(id).textContent;\n                navigator.clipboard.writeText(text).then(() => {\n                    const originalText = copyBtn.textContent;\n                    copyBtn.textContent = '\u30b3\u30d4\u30fc\u5b8c\u4e86\uff01';\n                    copyBtn.classList.add('arc-btn-success');\n                    setTimeout(() => {\n                        copyBtn.textContent = originalText;\n                        copyBtn.classList.remove('arc-btn-success');\n                    }, 2000);\n                });\n            };\n\n            window.addEventListener('resize', () => update());\n            setTimeout(() => update(), 100);\n        });\n    <\/script>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u30c4\u30fc\u30eb\u306f\u3001\u753b\u50cf\u306e\u5e45\u3068\u9ad8\u3055\u3092\u5165\u529b\u3059\u308b\u3060\u3051\u3067\u77ac\u6642\u306b\u30a2\u30b9\u30da\u30af\u30c8\u6bd4\uff08\u7e26\u6a2a\u6bd4\uff09\u3092\u8a08\u7b97\u3057\u3001\u30d7\u30ec\u30d3\u30e5\u30fc\u8868\u793a\u3068CSS\u30b3\u30fc\u30c9\u306e\u751f\u6210\u3092\u884c\u3046Web\u4fbf\u5229\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-0\">\u3053\u306e\u30c4\u30fc\u30eb\u3067\u3067\u304d\u308b\u3053\u3068<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u30a2\u30b9\u30da\u30af\u30c8\u6bd4\u306e\u81ea\u52d5\u8a08\u7b97\uff1a<\/strong> \u4efb\u610f\u306e\u30d4\u30af\u30bb\u30eb\u5024\u3092\u5165\u529b\u3059\u308b\u3068\u3001\u6700\u5c0f\u6574\u6570\u6bd4\uff08\u4f8b\uff1a16:9\uff09\u3092\u7b97\u51fa\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>\u6bd4\u7387\u3092\u7dad\u6301\u3057\u305f\u30b5\u30a4\u30ba\u5909\u66f4\uff1a<\/strong> \u300c\u56fa\u5b9a\u300d\u30dc\u30bf\u30f3\uff08\u9375\u30a2\u30a4\u30b3\u30f3\uff09\u3092\u62bc\u3059\u3068\u3001\u6bd4\u7387\u3092\u4fdd\u3063\u305f\u307e\u307e\u7247\u65b9\u306e\u6570\u5024\u3092\u5909\u66f4\u3057\u3066\u3001\u6700\u9069\u306a\u30b5\u30a4\u30ba\u3092\u63a2\u305b\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u30d7\u30ec\u30d3\u30e5\u30fc\uff1a<\/strong> \u5165\u529b\u3057\u305f\u6bd4\u7387\u304c\u8996\u899a\u7684\u306b\u3069\u306e\u7a0b\u5ea6\u306e\u5f62\u72b6\u306b\u306a\u308b\u304b\u3001\u30b0\u30ec\u30fc\u306e\u30a8\u30ea\u30a2\u3067\u5373\u5ea7\u306b\u78ba\u8a8d\u53ef\u80fd\u3067\u3059\u3002<\/li>\n\n\n\n<li><strong>CSS\u30b3\u30fc\u30c9\u751f\u6210\uff1a<\/strong> \u30e2\u30c0\u30f3\u306aWeb\u5236\u4f5c\u3067\u5fc5\u9808\u3068\u306a\u308b <code>aspect-ratio<\/code> \u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u30b3\u30fc\u30c9\u3092\u751f\u6210\u3057\u3001\u30ef\u30f3\u30af\u30ea\u30c3\u30af\u3067\u30b3\u30d4\u30fc\u3067\u304d\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>\u4e3b\u8981\u30d7\u30ea\u30bb\u30c3\u30c8\u9078\u629e\uff1a<\/strong> 16:9\u3084\u9ec4\u91d1\u6bd4\u306a\u3069\u3001\u3088\u304f\u4f7f\u308f\u308c\u308b\u6bd4\u7387\u3092\u4e00\u77ac\u3067\u30bb\u30c3\u30c8\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-1\">\u3053\u306e\u30c4\u30fc\u30eb\u3067\u53d6\u5f97\u3059\u308b\u60c5\u5831\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u30a2\u30b9\u30da\u30af\u30c8\u6bd4\u3068\u306f\uff1a<\/strong> \u77e9\u5f62\uff08\u56db\u89d2\u5f62\uff09\u306b\u304a\u3051\u308b\u300c\u6a2a\u5e45\u300d\u3068\u300c\u9ad8\u3055\u300d\u306e\u6bd4\u7387\u306e\u3053\u3068\u3067\u3059\u3002\u52d5\u753b\u3067\u306f16:9\u3001\u5199\u771f\u3067\u306f3:2\u306a\u3069\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/li>\n\n\n\n<li><strong>aspect-ratio\uff08CSS\u5c5e\u6027\uff09\uff1a<\/strong> \u5f93\u6765\u306eWeb\u5236\u4f5c\u3067\u306f padding-top \u306a\u3069\u3092\u7528\u3044\u305f\u8907\u96d1\u306a\u624b\u6cd5\u3067\u6bd4\u7387\u3092\u7dad\u6301\u3057\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u73fe\u5728\u306f <code>aspect-ratio: 16 \/ 9;<\/code> 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