{"id":9288,"date":"2026-08-09T15:36:48","date_gmt":"2026-08-09T13:36:48","guid":{"rendered":"https:\/\/www.lukaswojcik.com\/blog\/narzedzia\/base64-encode-decode-tool\/"},"modified":"2026-08-09T15:36:48","modified_gmt":"2026-08-09T13:36:48","slug":"base64-encode-decode-tool","status":"publish","type":"page","link":"https:\/\/www.lukaswojcik.com\/blog\/pl\/narzedzia\/base64-encode-decode-tool\/","title":{"rendered":"Base64 \u2013 kodowanie i dekodowanie"},"content":{"rendered":"<div class=\"base64-tool-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; line-height: 1.6;\">\n        Zakoduj dowolny tekst lub dane JSON w bezpieczny w UTF-8 ci\u0105g Base64 albo zdekoduj dane Base64 z powrotem na czytelny tekst.<br \/>\n        Ca\u0142e kodowanie i dekodowanie odbywa si\u0119 lokalnie w przegl\u0105darce \u2013 \u017cadne dane nie s\u0105 wysy\u0142ane na serwer ani tam zapisywane.\n    <\/p>\n<p>    <!-- INPUT AREA --><\/p>\n<div style=\"margin-bottom: 20px;\">\n<div style=\"display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px;\">\n            <label style=\"color: var(--text-primary); font-weight: 700; font-size: 0.9rem;\">Dane wej\u015bciowe:<\/label><br \/>\n            <button id=\"clear-input-btn\" style=\"background: transparent; border: none; color: var(--text-secondary); cursor: pointer; font-size: 0.8rem; text-decoration: underline;\">Wyczy\u015b\u0107 wej\u015bcie<\/button>\n        <\/div>\n<p>        <textarea id=\"base64-input\" placeholder=\"Wklej tutaj tekst, dane JSON lub ci\u0105g zakodowany w Base64 \u2026\" style=\"width: 100%; height: 180px; padding: 15px; background: var(--bg-body, #101416); border: 1px solid var(--border); border-radius: 8px; color: var(--text-primary); font-family: monospace; font-size: 0.9rem; box-sizing: border-box; resize: vertical;\"><\/textarea>\n    <\/div>\n<p>    <!-- ACTION BUTTONS --><\/p>\n<div style=\"display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 20px;\">\n        <button id=\"encode-btn\" class=\"button\" style=\"background: var(--accent, #2ba6df); color: #0b1114; border: none; padding: 11px 24px; border-radius: 6px; font-weight: 700; cursor: pointer;\">Koduj do Base64<\/button><br \/>\n        <button id=\"decode-btn\" class=\"button\" style=\"background: transparent; border: 1px solid var(--accent, #2ba6df); color: var(--accent, #2ba6df); padding: 11px 24px; border-radius: 6px; font-weight: 700; cursor: pointer;\">Dekoduj z Base64<\/button><br \/>\n        <button id=\"swap-btn\" class=\"button\" style=\"background: #242b30; color: var(--text-primary); border: 1px solid var(--border); padding: 11px 18px; border-radius: 6px; font-weight: 600; cursor: pointer; margin-left: auto;\">\u2191\u2193 Zamie\u0144 wej\u015bcie i wyj\u015bcie<\/button>\n    <\/div>\n<p>    <!-- STATUS \/ ERROR MESSAGE --><\/p>\n<div id=\"base64-status\" style=\"margin-bottom: 15px; font-size: 0.85rem; font-weight: bold;\"><\/div>\n<p>    <!-- OUTPUT AREA --><\/p>\n<div>\n<div style=\"display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px;\">\n            <label style=\"color: var(--text-primary); font-weight: 700; font-size: 0.9rem;\">Wynik:<\/label><br \/>\n            <button id=\"copy-output-btn\" style=\"background: transparent; border: 1px solid var(--border); color: var(--text-secondary); padding: 4px 10px; border-radius: 4px; cursor: pointer; font-size: 0.8rem;\">Kopiuj do schowka<\/button>\n        <\/div>\n<p>        <textarea id=\"base64-output\" readonly placeholder=\"Tutaj pojawi si\u0119 wynik \u2026\" style=\"width: 100%; height: 180px; padding: 15px; background: #0b1114; border: 1px solid var(--border); border-radius: 8px; color: #51cf66; font-family: monospace; font-size: 0.9rem; box-sizing: border-box; resize: vertical;\"><\/textarea>\n    <\/div>\n<\/div>\n<p><script>\n(() => {\n    const inputEl = document.getElementById(\"base64-input\");\n    const outputEl = document.getElementById(\"base64-output\");\n    const statusEl = document.getElementById(\"base64-status\");\n    const copyBtn = document.getElementById(\"copy-output-btn\");<\/p>\n<p>    \/\/ Helper: UTF-8 Safe Base64 Encode\n    const encodeBase64 = (str) => {\n        const bytes = new TextEncoder().encode(str);\n        const binString = Array.from(bytes, (byte) => String.fromCodePoint(byte)).join(\"\");\n        return btoa(binString);\n    };<\/p>\n<p>    \/\/ Helper: UTF-8 Safe Base64 Decode\n    const decodeBase64 = (base64) => {\n        const binString = atob(base64.replace(\/s+\/g, \"\"));\n        const bytes = Uint8Array.from(binString, (m) => m.codePointAt(0));\n        return new TextDecoder().decode(bytes);\n    };<\/p>\n<p>    \/\/ ENCODE ACTION\n    document.getElementById(\"encode-btn\").addEventListener(\"click\", () => {\n        const input = inputEl.value;\n        statusEl.innerHTML = \"\";\n        if (!input) {\n            statusEl.innerHTML = \"<span style='color:#ffc107;'>Prosz\u0119 wpisa\u0107 tekst do zakodowania.<\/span>\";\n            return;\n        }\n        try {\n            outputEl.value = encodeBase64(input);\n            outputEl.style.color = \"#51cf66\";\n            statusEl.innerHTML = \"<span style='color:#51cf66;'>\u2714 Pomy\u015blnie zakodowano do Base64 zgodnego z UTF-8.<\/span>\";\n        } catch (e) {\n            outputEl.value = \"\";\n            statusEl.innerHTML = \"<span style='color:#ff6b6b;'>B\u0142\u0105d kodowania: \" + e.message + \"<\/span>\";\n        }\n    });<\/p>\n<p>    \/\/ DECODE ACTION\n    document.getElementById(\"decode-btn\").addEventListener(\"click\", () => {\n        const input = inputEl.value;\n        statusEl.innerHTML = \"\";\n        if (!input) {\n            statusEl.innerHTML = \"<span style='color:#ffc107;'>Prosz\u0119 wpisa\u0107 ci\u0105g Base64 do zdekodowania.<\/span>\";\n            return;\n        }\n        try {\n            outputEl.value = decodeBase64(input);\n            outputEl.style.color = \"#2ba6df\";\n            statusEl.innerHTML = \"<span style='color:#51cf66;'>\u2714 Pomy\u015blnie zdekodowano ci\u0105g Base64.<\/span>\";\n        } catch (e) {\n            outputEl.value = \"\";\n            statusEl.innerHTML = \"<span style='color:#ff6b6b;'>B\u0142\u0105d dekodowania: nieprawid\u0142owy ci\u0105g Base64. Sprawd\u017a, czy nie zawiera niedozwolonych znak\u00f3w.<\/span>\";\n        }\n    });<\/p>\n<p>    \/\/ SWAP ACTION\n    document.getElementById(\"swap-btn\").addEventListener(\"click\", () => {\n        const temp = inputEl.value;\n        inputEl.value = outputEl.value;\n        outputEl.value = temp;\n        statusEl.innerHTML = \"<span style='color:var(--text-secondary);'>Zamieniono wej\u015bcie z wyj\u015bciem.<\/span>\";\n    });<\/p>\n<p>    \/\/ CLEAR INPUT\n    document.getElementById(\"clear-input-btn\").addEventListener(\"click\", () => {\n        inputEl.value = \"\";\n        outputEl.value = \"\";\n        statusEl.innerHTML = \"\";\n    });<\/p>\n<p>    \/\/ COPY TO CLIPBOARD\n    copyBtn.addEventListener(\"click\", async () => {\n        if (!outputEl.value) return;\n        try {\n            await navigator.clipboard.writeText(outputEl.value);\n            const originalText = copyBtn.textContent;\n            copyBtn.textContent = \"Skopiowano!\";\n            copyBtn.style.color = \"#51cf66\";\n            copyBtn.style.borderColor = \"#51cf66\";\n            setTimeout(() => {\n                copyBtn.textContent = originalText;\n                copyBtn.style.color = \"var(--text-secondary)\";\n                copyBtn.style.borderColor = \"var(--border)\";\n            }, 1800);\n        } catch (err) {\n            alert(\"Nie uda\u0142o si\u0119 skopiowa\u0107 do schowka.\");\n        }\n    });\n})();\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Zamienia tekst lub JSON na bezpieczny w UTF-8 ci\u0105g Base64 i dekoduje Base64 z powrotem na czytelny tekst \u2013 w ca\u0142o\u015bci lokalnie w przegl\u0105darce.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":9284,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-tool-base.php","meta":{"footnotes":""},"class_list":["post-9288","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - 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