{"id":12435,"date":"2025-12-03T15:26:00","date_gmt":"2025-12-03T06:26:00","guid":{"rendered":"https:\/\/rakkoserver.com\/plus\/?p=12070"},"modified":"2025-12-03T15:26:00","modified_gmt":"2025-12-03T06:26:00","slug":"tool-mime-encode-decode","status":"publish","type":"post","link":"https:\/\/rakkokeyword.com\/techo\/tool-mime-encode-decode\/","title":{"rendered":"MIME\u30a8\u30f3\u30b3\u30fc\u30c9\/\u30c7\u30b3\u30fc\u30c9\u30c4\u30fc\u30eb"},"content":{"rendered":"\n<style>\n  .rakko-mime-tool-wrap {\n    width: 100%;\n    max-width: 720px;\n    margin: 0 auto;\n    box-sizing: border-box;\n    border: none;\n    padding: 0;\n    font-family: -apple-system, BlinkMacSystemFont, \"Helvetica Neue\",\n      \"Segoe UI\", YuGothic, \"Yu Gothic\", \"Hiragino Kaku Gothic ProN\",\n      Meiryo, sans-serif;\n    color: #111;\n  }\n\n  .rakko-mime-tool-inner {\n    box-sizing: border-box;\n    background-color: #ffffff;\n  }\n\n  \/* \u30c4\u30fc\u30eb\u5185\u306e p \u306f\u3053\u3053\u3067\u7d71\u4e00\u7ba1\u7406\uff08\u30c6\u30fc\u30de\u306e p margin \u3092\u6253\u3061\u6d88\u3057\uff09 *\/\n  .rakko-mime-tool-inner p {\n    margin: 0 0 8px !important;\n  }\n\n  .rakko-mime-tool-section {\n    margin-bottom: 18px;\n  }\n\n  .rakko-mime-tool-section-heading {\n    font-size: 16px;\n    font-weight: 600;\n  }\n\n  .rakko-mime-tool-field-label {\n    font-size: 13px;\n    font-weight: 600;\n  }\n\n  \/* \u30aa\u30d7\u30b7\u30e7\u30f3\u884c\uff08PC\u306f\u6a2a\u4e26\u3073\uff09 *\/\n  .rakko-mime-tool-settings-row {\n    display: flex;\n    flex-wrap: wrap;\n    column-gap: 16px;\n    row-gap: 8px;\n    margin-top: 8px;\n  }\n\n  .rakko-mime-tool-setting-block {\n    flex: 1 1 200px;\n    min-width: 0;\n  }\n\n  .rakko-mime-tool-setting-label {\n    font-size: 12px;\n    margin: 0 0 4px !important;\n    color: #444;\n  }\n\n  .rakko-mime-tool-radio-group {\n    display: flex;\n    flex-direction: column;\n    gap: 4px;\n    font-size: 13px;\n  }\n\n  .rakko-mime-tool-radio-label {\n    display: flex;\n    align-items: center;\n    gap: 4px;\n    cursor: pointer;\n  }\n\n  .rakko-mime-tool-select {\n    width: 100%;\n    box-sizing: border-box;\n    padding: 6px 8px;\n    font-size: 13px;\n    border: 1px solid #7e8993;\n    border-radius: 3px;\n    background-color: #ffffff;\n  }\n\n  .rakko-mime-tool-select:disabled {\n    background-color: #f5f5f5;\n    color: #777;\n  }\n\n  .rakko-mime-tool-textarea,\n  .rakko-mime-tool-output-textarea {\n    width: 100%;\n    box-sizing: border-box;\n    padding: 8px;\n    border-radius: 3px;\n    border: 1px solid #7e8993;\n    font-size: 13px;\n    line-height: 1.5;\n    resize: vertical;\n    min-height: 120px;\n  }\n\n  .rakko-mime-tool-textarea::placeholder {\n    color: #888;\n  }\n\n  .rakko-mime-tool-output-textarea {\n    background-color: #f3f3f3;\n  }\n\n  .rakko-mime-tool-output-placeholder {\n    font-size: 13px;\n    color: #555;\n    padding: 8px;\n    box-sizing: border-box;\n    border-radius: 3px;\n    background-color: #fafafa;\n    border: 1px solid #dcdcdc;\n    min-height: 60px;\n    display: flex;\n    align-items: center;\n  }\n\n  .rakko-mime-tool-output-block {\n    box-sizing: border-box;\n  }\n\n  .rakko-mime-tool-output-label {\n    font-size: 13px;\n    font-weight: 600;\n    margin: 0 0 4px;\n  }\n\n  .rakko-mime-tool-meta {\n    margin: 4px 0 0;\n    font-size: 11px;\n    color: #666;\n  }\n\n  .rakko-mime-tool-error {\n    margin: 6px 0 0;\n    font-size: 12px;\n    color: #b00020;\n    min-height: 1.2em;\n  }\n\n  .rakko-mime-tool-actions {\n    display: flex;\n    flex-wrap: wrap;\n    gap: 8px;\n    justify-content: space-between;\n    margin-top: 12px;\n    margin-bottom: 24px; \/* \u30dc\u30bf\u30f3\u4e0b\u3068\u672c\u6587\u306e\u9593 *\/\n  }\n\n  .rakko-mime-tool-btn {\n    min-height: 40px;\n    padding: 0 16px;\n    border-radius: 3px;\n    border: none;\n    font-size: 13px;\n    font-weight: 600;\n    cursor: pointer;\n    box-sizing: border-box;\n    flex: 1 1 0;\n    text-align: center;\n  }\n\n  .rakko-mime-tool-btn-primary {\n    background-color: #007cba;\n    color: #ffffff;\n  }\n\n  .rakko-mime-tool-btn-secondary {\n    background-color: #007cba;\n    color: #ffffff;\n  }\n\n  .rakko-mime-tool-btn-primary:disabled,\n  .rakko-mime-tool-btn-secondary:disabled {\n    background-color: #b3d9ef;\n    cursor: default;\n  }\n\n  .rakko-mime-tool-btn:focus-visible {\n    outline: 2px solid #13284b;\n    outline-offset: 2px;\n  }\n\n  .rakko-mime-tool-hidden {\n    display: none;\n  }\n\n  .rakko-mime-tool-toast {\n    position: fixed;\n    left: 50%;\n    bottom: 24px;\n    transform: translateX(-50%);\n    padding: 8px 16px;\n    border-radius: 4px;\n    background-color: #333333;\n    color: #ffffff;\n    font-size: 12px;\n    opacity: 0;\n    pointer-events: none;\n    transition: opacity 0.2s ease-in-out;\n    z-index: 9999;\n  }\n\n  .rakko-mime-tool-toast-visible {\n    opacity: 1;\n  }\n\n  \/* \u25bc SP\u6700\u9069\u5316\uff1a\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u300c\u7e26\u4e26\u3073\u30fb\u5168\u5e45\u30fb\u30bf\u30a4\u30c8\u306a\u9593\u9694\u300d\u306b\u3059\u308b *\/\n  @media (max-width: 600px) {\n\n    .rakko-mime-tool-section {\n      margin-bottom: 14px;\n    }\n\n    \/* CIDR\u30c4\u30fc\u30eb\u3068\u540c\u3058\u30d1\u30bf\u30fc\u30f3\uff1a\u884c\u3092 block \u306b\u3057\u3066\u7e26\u7a4d\u307f *\/\n    .rakko-mime-tool-settings-row {\n      display: block !important;\n      margin-top: 4px !important;\n      column-gap: 0 !important;\n      row-gap: 0 !important;\n      gap: 0 !important;\n    }\n\n    .rakko-mime-tool-setting-block {\n      width: 100% !important;\n      flex: none !important;\n      min-width: 0 !important;\n      margin: 0 0 8px !important;  \/* \u5404\u30aa\u30d7\u30b7\u30e7\u30f3\u540c\u58eb\u306e\u7e26\u9593\u9694\u3092\u3053\u3053\u3067\u3060\u3051\u7ba1\u7406 *\/\n    }\n\n    .rakko-mime-tool-setting-block:last-child {\n      margin-bottom: 0 !important;\n    }\n\n    .rakko-mime-tool-setting-label {\n      margin-bottom: 2px !important;\n    }\n\n    .rakko-mime-tool-select {\n      padding-top: 5px !important;\n      padding-bottom: 5px !important;\n    }\n\n    .rakko-mime-tool-actions {\n      flex-direction: column;\n      align-items: stretch;\n    }\n\n    .rakko-mime-tool-btn {\n      width: 100%;\n    }\n  }\n<\/style>\n\n<div class=\"rakko-mime-tool-wrap\">\n  <div class=\"rakko-mime-tool-inner\">\n\n    <!-- \u30bb\u30af\u30b7\u30e7\u30f31: \u5165\u529b -->\n    <div class=\"rakko-mime-tool-section\">\n      <p class=\"rakko-mime-tool-section-heading\">1. \u5165\u529b<\/p>\n\n      <p class=\"rakko-mime-tool-field-label\">\u5909\u63db\u5bfe\u8c61\u30c6\u30ad\u30b9\u30c8<\/p>\n      <textarea id=\"rakko-mime-input\" class=\"rakko-mime-tool-textarea\" rows=\"6\" placeholder=\"\u3053\u3053\u306b\u30a8\u30f3\u30b3\u30fc\u30c9\uff0f\u30c7\u30b3\u30fc\u30c9\u3057\u305f\u3044\u6587\u5b57\u5217\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002\"><\/textarea>\n\n      <div class=\"rakko-mime-tool-settings-row\">\n        <div class=\"rakko-mime-tool-setting-block\">\n          <p class=\"rakko-mime-tool-setting-label\">\u51e6\u7406\u30e2\u30fc\u30c9<\/p>\n          <div class=\"rakko-mime-tool-radio-group\">\n            <label class=\"rakko-mime-tool-radio-label\">\n              <input type=\"radio\" name=\"rakko-mime-mode\" value=\"encode\" checked>\n              \u30a8\u30f3\u30b3\u30fc\u30c9\uff08\u5909\u63db\uff09\n            <\/label>\n            <label class=\"rakko-mime-tool-radio-label\">\n              <input type=\"radio\" name=\"rakko-mime-mode\" value=\"decode\">\n              \u30c7\u30b3\u30fc\u30c9\uff08\u5fa9\u5143\uff09\n            <\/label>\n          <\/div>\n        <\/div>\n\n        <div class=\"rakko-mime-tool-setting-block\">\n          <p class=\"rakko-mime-tool-setting-label\">\u6587\u5b57\u30b3\u30fc\u30c9\uff08Charset\uff09<\/p>\n          <select id=\"rakko-mime-charset\" class=\"rakko-mime-tool-select\">\n            <option value=\"UTF-8\" selected>UTF-8<\/option>\n            <option value=\"ISO-2022-JP\">ISO-2022-JP<\/option>\n            <option value=\"Shift_JIS\">Shift_JIS<\/option>\n            <option value=\"EUC-JP\">EUC-JP<\/option>\n            <option value=\"US-ASCII\">US-ASCII<\/option>\n          <\/select>\n        <\/div>\n\n        <div class=\"rakko-mime-tool-setting-block\">\n          <p class=\"rakko-mime-tool-setting-label\">\u30a8\u30f3\u30b3\u30fc\u30c9\u65b9\u5f0f<\/p>\n          <select id=\"rakko-mime-encoding\" class=\"rakko-mime-tool-select\">\n            <option value=\"base64\" selected>Base64<\/option>\n            <option value=\"quoted-printable\">Quoted-Printable<\/option>\n            <option value=\"url\">URL Encode<\/option>\n          <\/select>\n        <\/div>\n      <\/div>\n    <\/div>\n\n    <!-- \u30bb\u30af\u30b7\u30e7\u30f32: \u51fa\u529b -->\n    <div class=\"rakko-mime-tool-section\">\n      <p class=\"rakko-mime-tool-section-heading\">2. \u7d50\u679c<\/p>\n\n      <div id=\"rakko-mime-output-placeholder\" class=\"rakko-mime-tool-output-placeholder\">\n        \u5165\u529b\u3059\u308b\u3068\u30a8\u30f3\u30b3\u30fc\u30c9\uff0f\u30c7\u30b3\u30fc\u30c9\u7d50\u679c\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002\uff08PHP\u30b5\u30fc\u30d0\u51e6\u7406\u30fb\u6307\u5b9a\u6587\u5b57\u30b3\u30fc\u30c9\u5bfe\u5fdc\uff09\n      <\/div>\n\n      <div id=\"rakko-mime-output-block\" class=\"rakko-mime-tool-output-block rakko-mime-tool-hidden\">\n        <p class=\"rakko-mime-tool-output-label\">\u5909\u63db\u7d50\u679c\u30c6\u30ad\u30b9\u30c8<\/p>\n        <textarea id=\"rakko-mime-output\" class=\"rakko-mime-tool-output-textarea\" rows=\"6\" readonly><\/textarea>\n        <p id=\"rakko-mime-meta\" class=\"rakko-mime-tool-meta\"><\/p>\n      <\/div>\n\n      <p id=\"rakko-mime-error\" class=\"rakko-mime-tool-error\" aria-live=\"polite\"><\/p>\n    <\/div>\n\n    <!-- \u64cd\u4f5c\u30dc\u30bf\u30f3 -->\n    <div class=\"rakko-mime-tool-actions\">\n      <button type=\"button\" id=\"rakko-mime-copy-btn\" class=\"rakko-mime-tool-btn rakko-mime-tool-btn-primary\" disabled>\n        \u7d50\u679c\u3092\u30b3\u30d4\u30fc\n      <\/button>\n      <button type=\"button\" id=\"rakko-mime-clear-btn\" class=\"rakko-mime-tool-btn rakko-mime-tool-btn-secondary\">\n        \u30af\u30ea\u30a2\n      <\/button>\n    <\/div>\n\n    <!-- \u30c8\u30fc\u30b9\u30c8 -->\n    <div id=\"rakko-mime-toast\" class=\"rakko-mime-tool-toast\" aria-live=\"polite\"><\/div>\n  <\/div>\n<\/div>\n\n\n\n<p>\u30e1\u30fc\u30eb\u306e\u4ef6\u540d\uff08MIME\u5f62\u5f0f\uff09\u306a\u3069\u306e\u30c7\u30fc\u30bf\u3092\u3001\u5165\u529b\u3059\u308b\u3060\u3051\u3067\u7c21\u5358\u306b\u30a8\u30f3\u30b3\u30fc\u30c9\uff08\u5909\u63db\uff09\u30fb\u30c7\u30b3\u30fc\u30c9\uff08\u5fa9\u5143\uff09\u3067\u304d\u308b\u7121\u6599\u306eWEB\u30c4\u30fc\u30eb\u3067\u3059\u3002\u30d6\u30e9\u30a6\u30b6\u4e0a\u3067\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u306b\u51e6\u7406\u3092\u884c\u3046\u305f\u3081\u3001\u30c7\u30fc\u30bf\u304c\u5916\u90e8\u306b\u9001\u4fe1\u3055\u308c\u308b\u3053\u3068\u306f\u306a\u304f\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u9762\u3067\u3082\u5b89\u5fc3\u3057\u3066\u304a\u4f7f\u3044\u3044\u305f\u3060\u3051\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-0\">\u3053\u306e\u30c4\u30fc\u30eb\u3067\u3067\u304d\u308b\u3053\u3068<\/h3>\n\n\n\n<p>\u3053\u306e\u30c4\u30fc\u30eb\u3067\u306f\u3001\u4e3b\u306b\u4ee5\u4e0b\u306e\u5909\u63db\u51e6\u7406\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>MIME\u30c7\u30b3\u30fc\u30c9\uff08\u5fa9\u5143\uff09<\/strong> \u30e1\u30fc\u30eb\u306e\u4ef6\u540d\u306a\u3069\u3067\u898b\u3089\u308c\u308b <code>\u200b\u200b=?ISO-2022-JP?B?...?=\u200b\u200b<\/code> \u3068\u3044\u3063\u305f\u6587\u5b57\u5217\u3092\u3001\u4eba\u9593\u304c\u8aad\u3081\u308b\u65e5\u672c\u8a9e\u306b\u5fa9\u5143\u3057\u307e\u3059\u3002\u6587\u5b57\u5316\u3051\u3057\u3066\u8aad\u3081\u306a\u3044\u30e1\u30fc\u30eb\u306e\u89e3\u8aad\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>MIME\u30a8\u30f3\u30b3\u30fc\u30c9\uff08\u5909\u63db\uff09<\/strong> \u901a\u5e38\u306e\u65e5\u672c\u8a9e\u30c6\u30ad\u30b9\u30c8\u3092\u3001\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u3067\u4f7f\u7528\u53ef\u80fd\u306aMIME\u5f62\u5f0f\uff08<code>\u200b\u200b=?UTF-8?B?...?=\u200b\u200b<\/code> \u306a\u3069\uff09\u306b\u5909\u63db\u3057\u307e\u3059\u3002\u30e1\u30fc\u30eb\u9001\u4fe1\u30b7\u30b9\u30c6\u30e0\u306e\u30c6\u30b9\u30c8\u3084\u3001\u6587\u5b57\u5316\u3051\u306e\u6319\u52d5\u78ba\u8a8d\u306a\u3069\u306b\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>Base64\u306e\u30a8\u30f3\u30b3\u30fc\u30c9\u30fb\u30c7\u30b3\u30fc\u30c9<\/strong> \u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf\u3092Base64\u5f62\u5f0f\u306b\u5909\u63db\u3057\u305f\u308a\u3001\u9006\u306bBase64\u6587\u5b57\u5217\u3092\u5143\u306e\u30c6\u30ad\u30b9\u30c8\u306b\u623b\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u753b\u50cf\u30c7\u30fc\u30bf\u3084Basic\u8a8d\u8a3c\u306e\u6587\u5b57\u5217\u4f5c\u6210\u306b\u3082\u5bfe\u5fdc\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>URL\u30a8\u30f3\u30b3\u30fc\u30c9\u30fb\u30c7\u30b3\u30fc\u30c9<\/strong> URL\u306b\u542b\u307e\u308c\u308b <code>\u200b\u200b%E3%81...\u200b\u200b<\/code> \u306e\u3088\u3046\u306a\u6587\u5b57\u5217\u3092\u5143\u306e\u65e5\u672c\u8a9e\u306b\u623b\u3057\u305f\u308a\u3001\u9006\u306b\u65e5\u672c\u8a9e\u3092URL\u3067\u4f7f\u7528\u3067\u304d\u308b\u5f62\u5f0f\u306b\u5909\u63db\u3067\u304d\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>\u6587\u5b57\u30b3\u30fc\u30c9\u306e\u6307\u5b9a\u5909\u63db<\/strong> UTF-8\u3060\u3051\u3067\u306a\u304f\u3001ISO-2022-JP\uff08JIS\uff09\u3001Shift_JIS\u3001EUC-JP\u306a\u3069\u3001\u7279\u5b9a\u306e\u6587\u5b57\u30b3\u30fc\u30c9\u3092\u6307\u5b9a\u3057\u3066\u306e\u5909\u63db\u304c\u53ef\u80fd\u3067\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u4f7f\u3044\u65b9\u306e\u624b\u9806<\/h3>\n\n\n\n<p>\u753b\u9762\u4e0a\u306e\u300c1. \u5165\u529b\u300d\u30a8\u30ea\u30a2\u304b\u3089\u64cd\u4f5c\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>\u30c6\u30ad\u30b9\u30c8\u3092\u5165\u529b\u3059\u308b<\/strong> \u300c\u5909\u63db\u5bfe\u8c61\u30c6\u30ad\u30b9\u30c8\u300d\u306e\u6b04\u306b\u3001\u5909\u63db\u3057\u305f\u3044\u6587\u5b57\u5217\u3092\u5165\u529b\u307e\u305f\u306f\u8cbc\u308a\u4ed8\u3051\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>\u51e6\u7406\u30e2\u30fc\u30c9\u3092\u9078\u3076<\/strong> \u5165\u529b\u3057\u305f\u30c7\u30fc\u30bf\u3092\u5143\u306b\u623b\u3057\u305f\u3044\u5834\u5408\u306f\u300c\u30c7\u30b3\u30fc\u30c9\uff08\u5fa9\u5143\uff09\u300d\u3001\u30c7\u30fc\u30bf\u5f62\u5f0f\u3092\u5909\u63db\u3057\u305f\u3044\u5834\u5408\u306f\u300c\u30a8\u30f3\u30b3\u30fc\u30c9\uff08\u5909\u63db\uff09\u300d\u3092\u9078\u629e\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>\u8a2d\u5b9a\u3092\u8abf\u6574\u3059\u308b\uff08\u5fc5\u8981\u306a\u5834\u5408\uff09<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u6587\u5b57\u30b3\u30fc\u30c9 (Charset)<\/strong>: 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<code>=?UTF-8?B?...<\/code> \u306e\u3088\u3046\u306a\u8a18\u53f7\u306e\u7f85\u5217\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u3001\u5185\u5bb9\u304c\u8aad\u3081\u306a\u3044\u5834\u5408\u306b\u3001\u3053\u306e\u30c4\u30fc\u30eb\u306b\u8cbc\u308a\u4ed8\u3051\u308b\u3053\u3068\u3067\u5143\u306e\u65e5\u672c\u8a9e\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>\u958b\u767a\u30fb\u30c7\u30d0\u30c3\u30b0\u4f5c\u696d\u3092\u884c\u3046\u3068\u304d<\/strong> 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