{"id":9907,"date":"2023-10-19T15:58:15","date_gmt":"2023-10-19T07:58:15","guid":{"rendered":"https:\/\/www.cybermedian.com\/ja\/choosing-the-right-image-format-for-your-website\/"},"modified":"2026-04-20T09:10:14","modified_gmt":"2026-04-20T09:10:14","slug":"choosing-the-right-image-format-for-your-website","status":"publish","type":"post","link":"https:\/\/www.cybermedian.com\/ja\/choosing-the-right-image-format-for-your-website\/","title":{"rendered":"\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u9069\u3057\u305f\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u9078\u3076"},"content":{"rendered":"<p>\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u6240\u6709\u8005\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u70b9\u3092\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<a href=\"https:\/\/www.websites360.com\/blog\/the-why-and-how-of-image-optimization#:~:text=Optimizing%20your%20images%20helps%20to,engine%20optimization)%20of%20your%20website.\">\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u753b\u50cf<\/a>\u8996\u899a\u7684\u306b\u9b45\u529b\u7684\u3067\u3042\u308b\u3060\u3051\u3067\u306a\u304f\u3001<strong>\u30a6\u30a7\u30d6\u5229\u7528\u306b\u6700\u9069\u5316\u3055\u308c\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/strong>\u3053\u308c\u3092\u9054\u6210\u3059\u308b\u305f\u3081\u306e\u6700\u3082\u91cd\u8981\u306a\u8981\u56e0\u306e\u4e00\u3064\u306f\u3001\u9069\u5207\u306a\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u3053\u306e\u6295\u7a3f\u3067\u306f\u3001<strong>\u4e0a\u4f4d3\u3064\u306e\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3068\u305d\u308c\u305e\u308c\u306e\u5177\u4f53\u7684\u306a\u7528\u9014\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/strong><\/p>\n<p><img alt=\"\" class=\"alignnone size-full wp-image-11167\" decoding=\"async\" height=\"400\" loading=\"lazy\" sizes=\"auto, (max-width: 696px) 100vw, 696px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/10\/00667-4040373965.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/10\/00667-4040373965.png 696w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/10\/00667-4040373965-300x172.png 300w\" width=\"696\"\/><\/p>\n<h2>JPEG<\/h2>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Joint_Photographic_Experts_Group\">JPEG\uff08Joint Photographic Experts Group\uff09<\/a>\u306f\u3001\u30a6\u30a7\u30d6\u4e0a\u3067\u6700\u3082\u3088\u304f\u4f7f\u308f\u308c\u308b\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u4e00\u3064\u3067\u3059\u3002\u305d\u308c\u306f<strong>\u640d\u5931\u3042\u308a\u5f62\u5f0f\u3067\u3042\u308a\u3001<\/strong>\u753b\u50cf\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u5c0f\u3055\u304f\u3059\u308b\u305f\u3081\u306b\u5727\u7e2e\u3059\u308b\u3068\u3044\u3046\u610f\u5473\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u8a73\u7d30\u3084\u8272\u306e\u5909\u5316\u304c\u8c4a\u5bcc\u306a\u5199\u771f\u3084\u8907\u96d1\u306a\u753b\u50cf\u306b\u6700\u9069\u3067\u3059\u3002<\/p>\n<p><strong>JPEG\u306e\u5229\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u304c\u5c0f\u3055\u3044<\/li>\n<li>\u9ad8\u54c1\u8cea\u306a\u5727\u7e2e<\/li>\n<li>\u307b\u3068\u3093\u3069\u306e\u30a6\u30a7\u30d6\u30d6\u30e9\u30a6\u30b6\u3084\u30c7\u30d0\u30a4\u30b9\u3068\u4e92\u63db\u6027\u304c\u3042\u308b<\/li>\n<\/ul>\n<p><strong>JPEG\u306e\u6b20\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>\u640d\u5931\u3042\u308a\u5727\u7e2e\u306b\u3088\u308a\u753b\u50cf\u54c1\u8cea\u304c\u4f4e\u4e0b\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b<\/li>\n<li>\u900f\u660e\u80cc\u666f\u306e\u753b\u50cf\u306b\u306f\u9069\u3057\u3066\u3044\u306a\u3044<\/li>\n<li>\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306e\u30b5\u30dd\u30fc\u30c8\u304c\u9650\u3089\u308c\u3066\u3044\u308b<\/li>\n<\/ul>\n<h2>PNG<\/h2>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/PNG\">PNG\uff08Portable Network Graphics\uff09<\/a>\u306f\u3001\u30a6\u30a7\u30d6\u5229\u7528\u306e\u305f\u3081\u306e\u3082\u3046\u4e00\u3064\u306e\u4eba\u6c17\u306e\u3042\u308b\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u3059\u3002JPEG\u3068\u306f\u7570\u306a\u308a\u3001PNG\u306f\u640d\u5931\u306a\u3057\u5727\u7e2e\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u3053\u308c\u306f<strong>\u5143\u306e\u753b\u50cf\u306e\u3059\u3079\u3066\u306e\u8a73\u7d30\u3068\u8272\u60c5\u5831\u3092\u4fdd\u6301\u3059\u308b<\/strong>\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u900f\u660e\u80cc\u666f\u3084\u30b7\u30f3\u30d7\u30eb\u306a\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u306e\u753b\u50cf\u306b\u6700\u9069\u3067\u3059\u3002<\/p>\n<p><strong>PNG\u306e\u5229\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>\u640d\u5931\u306a\u3057\u5727\u7e2e<\/li>\n<li>\u900f\u660e\u5ea6\u3092\u30b5\u30dd\u30fc\u30c8<\/li>\n<li>\u30b7\u30f3\u30d7\u30eb\u306a\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u3084\u30ed\u30b4\u306b\u6700\u9069<\/li>\n<\/ul>\n<p><strong>PNG\u306e\u6b20\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>JPEG\u3088\u308a\u3082\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u304c\u5927\u304d\u3044<\/li>\n<li>\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306e\u30b5\u30dd\u30fc\u30c8\u304c\u9650\u5b9a\u7684<\/li>\n<li>\u5199\u771f\u3084\u8907\u96d1\u306a\u753b\u50cf\u306b\u306f\u9069\u3057\u3066\u3044\u306a\u3044<\/li>\n<\/ul>\n<h2>GIF<\/h2>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/GIF\">GIF\uff08\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u30b9\u4ea4\u63db\u5f62\u5f0f\uff09<\/a>\u306f\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u5f62\u5f0f\u3067\u3001\u5c0f\u3055\u306a<strong>\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3067\u306e\u30b7\u30f3\u30d7\u30eb\u306a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u304f\u4f7f\u308f\u308c\u308b<\/strong>\u7121\u640d\u5931\u5727\u7e2e\u3068\u9650\u3089\u308c\u305f\u8272\u6570\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u3084\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306b\u6700\u9069\u3067\u3042\u308b<\/p>\n<p><strong>GIF\u306e\u5229\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u30b5\u30dd\u30fc\u30c8<\/li>\n<li>\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u304c\u5c0f\u3055\u3044<\/li>\n<li>\u30b7\u30f3\u30d7\u30eb\u306a\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u3084\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306b\u6700\u9069<\/li>\n<\/ul>\n<p><strong>GIF\u306e\u6b20\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>\u8272\u6570\u304c\u9650\u3089\u308c\u3066\u3044\u308b<\/li>\n<li>\u5199\u771f\u3084\u8907\u96d1\u306a\u753b\u50cf\u306b\u306f\u9069\u3057\u3066\u3044\u306a\u3044<\/li>\n<li>\u900f\u660e\u5ea6\u306e\u30b5\u30dd\u30fc\u30c8\u304c\u9650\u5b9a\u7684<\/li>\n<\/ul>\n<h2>WebP<\/h2>\n<p><a href=\"https:\/\/developers.google.com\/speed\/webp#:~:text=WebP%20is%20a%20modern%20image,that%20make%20the%20web%20faster.\">WebP<\/a>\u306fGoogle\u304c\u958b\u767a\u3057\u305f\u6bd4\u8f03\u7684\u65b0\u3057\u3044\u753b\u50cf\u5f62\u5f0f\u3067\u3042\u308b\u3002\u3053\u308c\u306f<strong>\u640d\u5931\u3042\u308a\u304a\u3088\u3073\u640d\u5931\u306a\u3057\u306e\u4e21\u65b9\u306e\u5727\u7e2e\u65b9\u5f0f<\/strong>\u3092\u7528\u3044\u3066\u3001JPEG\u3084PNG\u3088\u308a\u3082<strong>\u5c0f\u3055\u306a\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3067\u9ad8\u54c1\u8cea\u306a\u753b\u50cf\u3092\u5b9f\u73fe\u3059\u308b<\/strong>WebP\u306f\u3001\u5199\u771f\u3084\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u306e\u3088\u3046\u306b\u8a73\u7d30\u304c\u591a\u304f\u8272\u306e\u5909\u5316\u304c\u3042\u308b\u753b\u50cf\u306b\u7279\u306b\u6709\u7528\u3067\u3042\u308b<\/p>\n<p><strong>WebP\u306e\u5229\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>\u9ad8\u54c1\u8cea\u306a\u5727\u7e2e<\/li>\n<li>JPEG\u3084PNG\u3088\u308a\u3082\u5c0f\u3055\u306a\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba<\/li>\n<li>\u900f\u660e\u5ea6\u3068\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u30b5\u30dd\u30fc\u30c8<\/li>\n<\/ul>\n<p><strong>WebP\u306e\u6b20\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>\u53e4\u3044Web\u30d6\u30e9\u30a6\u30b6\u3067\u306e\u30b5\u30dd\u30fc\u30c8\u304c\u9650\u5b9a\u7684<\/li>\n<li>\u4e00\u90e8\u306e\u753b\u50cf\u7de8\u96c6\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3067\u306e\u30b5\u30dd\u30fc\u30c8\u304c\u9650\u5b9a\u7684<\/li>\n<\/ul>\n<h2>SVG<\/h2>\n<p><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/SVG\">SVG\uff08\u62e1\u5927\u7e2e\u5c0f\u53ef\u80fd\u306a\u30d9\u30af\u30bf\u30fc\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u30b9\uff09<\/a>\u306f\u3001\u30d9\u30af\u30bf\u30fc\u30d9\u30fc\u30b9\u306e\u753b\u50cf\u5f62\u5f0f\u3067\u3042\u308a\u3001<strong>\u30b7\u30f3\u30d7\u30eb\u306a\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u3084\u30ed\u30b4\u306b\u6700\u9069\u3067\u3059\u3002<\/strong>JPEG\u3084PNG\u306e\u3088\u3046\u306a\u30e9\u30b9\u30bf\u30fc\u30d9\u30fc\u30b9\u306e\u5f62\u5f0f\u3068\u306f\u7570\u306a\u308a\u3001SVG\u753b\u50cf\u306f\u30d4\u30af\u30bb\u30eb\u3067\u306f\u306a\u304f\u6570\u5b66\u7684\u65b9\u7a0b\u5f0f\u3092\u4f7f\u7528\u3057\u3066\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001SVG\u753b\u50cf\u306f\u54c1\u8cea\u3092\u640d\u306a\u3046\u3053\u3068\u306a\u304f\u62e1\u5927\u307e\u305f\u306f\u7e2e\u5c0f\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><strong>SVG\u306e\u5229\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>\u54c1\u8cea\u3092\u640d\u306a\u308f\u305a\u62e1\u5927\u53ef\u80fd<\/li>\n<li>\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u304c\u5c0f\u3055\u3044<\/li>\n<li>\u30b7\u30f3\u30d7\u30eb\u306a\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u3084\u30ed\u30b4\u306b\u6700\u9069<\/li>\n<\/ul>\n<p><strong>SVG\u306e\u6b20\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>\u8907\u96d1\u306a\u753b\u50cf\u3078\u306e\u5bfe\u5fdc\u304c\u9650\u3089\u308c\u3066\u3044\u308b<\/li>\n<li>\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3078\u306e\u5bfe\u5fdc\u304c\u9650\u3089\u308c\u3066\u3044\u308b<\/li>\n<\/ul>\n<h2>\u753b\u50cf\u5f62\u5f0f\u9593\u306e\u5909\u63db<\/h2>\n<p>\u753b\u50cf\u5f62\u5f0f\u9593\u306e\u5909\u63db\u304c\u5fc5\u8981\u306a\u5834\u5408\u3001\u30aa\u30f3\u30e9\u30a4\u30f3\u306e\u30d5\u30a1\u30a4\u30eb\u5909\u63db\u30c4\u30fc\u30eb\u3092\u5229\u7528\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u3088\u3046\u306a\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306e\u4e00\u3064\u304c<a href=\"https:\/\/online.visual-paradigm.com\/file-converters\/file-conversion-tools\/\" rel=\"noreferrer noopener\" target=\"_blank\">Visual Paradigm\u306e\u30d5\u30a1\u30a4\u30eb\u5909\u63db\u30c4\u30fc\u30eb<\/a>\u3067\u3059\u3002\u3053\u306e\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3092\u4f7f\u3048\u3070\u3001\u753b\u50cf\u3092\u7c21\u5358\u306b<strong>Web\u5229\u7528\u306b\u9069\u3057\u305f\u3055\u307e\u3056\u307e\u306a\u5f62\u5f0f\u306b\u5909\u63db\u3067\u304d\u307e\u3059\u3002<\/strong>\u753b\u50cf\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3057\u3066\u3001\u5fc5\u8981\u306a\u51fa\u529b\u5f62\u5f0f\u3092\u9078\u629e\u3059\u308b\u3060\u3051\u3067\u3059\u3002\u3053\u306e\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306f\u5909\u63db\u30d7\u30ed\u30bb\u30b9\u3092\u52b9\u7387\u7684\u306b\u51e6\u7406\u3057\u3001\u54c1\u8cea\u3092\u640d\u306a\u3046\u3053\u3068\u306a\u304f\u753b\u50cf\u3092Web\u5229\u7528\u306b\u6700\u9069\u5316\u3057\u307e\u3059\u3002<\/p>\n<p id=\"pFfYOQl\"><img alt=\"\" class=\"alignnone size-full wp-image-11164\" decoding=\"async\" height=\"451\" loading=\"lazy\" sizes=\"auto, (max-width: 938px) 100vw, 938px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/10\/img_6527a948ad4e2.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/10\/img_6527a948ad4e2.png 938w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/10\/img_6527a948ad4e2-300x144.png 300w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2023\/10\/img_6527a948ad4e2-768x369.png 768w\" width=\"938\"\/><\/p>\n<p>Visual 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