{"id":8801,"date":"2026-08-05T13:59:19","date_gmt":"2026-08-05T11:59:19","guid":{"rendered":"https:\/\/www.lukaswojcik.com\/blog\/?page_id=8801"},"modified":"2026-08-05T15:36:55","modified_gmt":"2026-08-05T13:36:55","slug":"ga4-gcd-parameter-decoder","status":"publish","type":"page","link":"https:\/\/www.lukaswojcik.com\/blog\/en\/toolbox\/ga4-gcd-parameter-decoder\/","title":{"rendered":"GA4 gcd Parameter Decoder"},"content":{"rendered":"<div class=\"gtm-analyser-container\" style=\"background: var(--bg-panel, #1e1e24); padding: 25px; border-radius: 8px; border: 1px solid var(--border, #2a2a35);\">\n<p style=\"color: var(--text-secondary); margin-bottom: 20px;\">\n        Paste the cryptic <code>gcd<\/code> parameter value (e.g., <code>11r1r1r1r5<\/code>) from your GA4 collect network request to decode storage states and update sources.\n    <\/p>\n<div style=\"display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap;\">\n<div style=\"flex: 1; min-width: 260px;\">\n            <input type=\"text\" id=\"gcd-input\" class=\"form-control\" placeholder=\"e.g., 11r1r1r1r5 or 11v1v1v1v5\" style=\"width: 100%; padding: 12px; background: var(--bg-body, #101416); border: 1px solid var(--border); color: var(--text-primary); border-radius: 6px; font-family: monospace;\">\n        <\/div>\n<p>        <button id=\"decode-gcd-btn\" class=\"button\" style=\"background: var(--accent, #2ba6df); color: #0b1114; border: none; padding: 12px 24px; border-radius: 6px; font-weight: 700; cursor: pointer;\">Decode gcd<\/button>\n    <\/div>\n<div id=\"gcd-results\" style=\"margin-top: 25px;\"><\/div>\n<\/div>\n<p><script>\ndocument.getElementById(\"decode-gcd-btn\").addEventListener(\"click\", () => {\n    const val = document.getElementById(\"gcd-input\").value.trim().toLowerCase();\n    const results = document.getElementById(\"gcd-results\");<\/p>\n<p>    if (val.length < 9) {\n        results.innerHTML = \"\n\n<p style='color:#ff6b6b;'>Invalid gcd string format. Expected format like 11r1r1r1r5.<\/p>\n<p>\";\n        return;\n    }<\/p>\n<p>    const decodeLetter = (char) => {\n        switch(char) {\n            case \"p\": return { state: \"Denied\", source: \"Default (Unconfigured)\", badge: \"denied\" };\n            case \"q\": case \"r\": return { state: \"Denied\", source: \"Default (Explicit)\", badge: \"denied\" };\n            case \"t\": return { state: \"Granted\", source: \"Default (Explicit)\", badge: \"granted\" };\n            case \"u\": return { state: \"Denied\", source: \"Update (User Action)\", badge: \"denied\" };\n            case \"v\": return { state: \"Granted\", source: \"Update (User Action)\", badge: \"granted\" };\n            case \"l\": case \"m\": case \"n\": return { state: \"Granted \/ Denied\", source: \"Template \/ Tag Gateway Variation\", badge: \"granted\" };\n            default: return { state: \"Unknown (\" + char + \")\", source: \"Unmapped Code\", badge: \"denied\" };\n        }\n    };<\/p>\n<p>    const adStorage = decodeLetter(val.charAt(2));\n    const anStorage = decodeLetter(val.charAt(4));\n    const adUserData = decodeLetter(val.charAt(6));\n    const adPersonalization = decodeLetter(val.charAt(8));<\/p>\n<p>    const renderCard = (title, data) => `<\/p>\n<div style=\"background: var(--bg-body, #101416); border-left: 4px solid ${data.badge === \"granted\" ? \"#51cf66\" : \"#ff6b6b\"}; padding: 15px; margin-bottom: 10px; border-radius: 4px;\">\n            <strong style=\"color: var(--text-primary); display: block; font-size: 1rem;\">${title}<\/strong>\n            <span style=\"display: inline-block; padding: 4px 8px; border-radius: 4px; font-weight: bold; font-size: 0.85rem; margin-top: 6px; background: ${data.badge === \"granted\" ? \"#1a4731\" : \"#471a1a\"}; color: ${data.badge === \"granted\" ? \"#51cf66\" : \"#ff6b6b\"};\">${data.state}<\/span>\n            <span style=\"color: var(--text-secondary); font-size: 0.9rem; margin-left: 10px;\">Source: ${data.source}<\/span>\n        <\/div>\n<p>    `;<\/p>\n<p>    results.innerHTML = \n        renderCard(\"ad_storage\", adStorage) +\n        renderCard(\"analytics_storage\", anStorage) +\n        renderCard(\"ad_user_data\", adUserData) +\n        renderCard(\"ad_personalization\", adPersonalization);\n});\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Decode cryptic GA4 gcd consent parameter strings into actionable storage states and update origins.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":38,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-tool-base.php","meta":{"footnotes":""},"class_list":["post-8801","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - 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