online-tools/base64_decode.html at master · emn178/online-tools · GitHub

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<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="content-language" content="en"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Base64 Decode - Online Tools</title><base href="/online-tools/"><meta name="keywords" content="Base64,online,decode,string,custom alphabet"><meta name="author" content="emn178"><meta name="copyright" content="emn178"><meta name="description" content="Decode standard Base64, Base64URL, unpadded, IMAP-style, or custom-alphabet data to text or binary bytes online."><meta property="og:type" content="website"><meta property="og:title" content="Base64 Decode"><meta property="og:url" content="https://emn178.github.io/online-tools/base64_decode.html"><meta property="og:site_name" content="Online Tools"><meta property="og:description" content="Decode standard Base64, Base64URL, unpadded, IMAP-style, or custom-alphabet data to text or binary bytes online."><meta property="og:locale" content="en"><meta property="og:image" content="https://emn178.github.io/online-tools/images/logo.svg"><meta property="article:author" content="emn178"><meta property="article:tag" content="Base64,online,decode,string,custom alphabet"><meta property="twitter:card" content="summary"><meta property="twitter:image" content="https://emn178.github.io/online-tools/images/logo.svg"><link rel="canonical" href="https://emn178.github.io/online-tools/base64_decode.html"><script type="application/ld+json">{"@context":"https://schema.org","@type":"WebApplication","name":"Base64 Decode","description":"Decode standard Base64, Base64URL, unpadded, IMAP-style, or custom-alphabet data to text or binary bytes online.","url":"https://emn178.github.io/online-tools/base64_decode.html","applicationCategory":"UtilitiesApplication","operatingSystem":"Any","isAccessibleForFree":true,"offers":{"@type":"Offer","price":0,"priceCurrency":"USD"}}</script><link rel="icon" href="images/logo.svg"><script>var delayScripts = [];
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</script><link rel="stylesheet" href="css/style.css?v=36"></head><body><div id="app"><div id="sidebar"><div class="mask"></div><div class="container"><header><a href="./"><img src="images/logo.svg" width="18" height="18" alt="Logo"><h2>Online Tools</h2></a><div class="toolbar"><button class="icon theme"><img class="light" src="images/light.svg" alt="Dark mode" title="Dark mode"><img class="dark" src="images/dark.svg" alt="Dark mode" title="Dark mode"></button></div></header><div class="section"><h3>Hash</h3><details><summary>CRC</summary><nav><ol><li><a href="crc/">CRC</a></li><li><a href="crc16/">CRC-16</a></li><li><a href="crc32/">CRC-32</a></li></ol></nav></details><details><summary>MD</summary><nav><ol><li><a href="md2.html">MD2</a></li><li><a href="md2_file_hash.html">MD2 File</a></li><li><a href="md4.html">MD4</a></li><li><a href="md4_file_hash.html">MD4 File</a></li><li><a href="md5.html">MD5</a></li><li><a href="md5_checksum.html">MD5 File</a></li></ol></nav></details><details><summary>SHA1</summary><nav><ol><li><a href="sha1.html">SHA1</a></li><li><a href="sha1_checksum.html">SHA1 File</a></li></ol></nav></details><details><summary>SHA2</summary><nav><ol><li><a href="sha224.html">SHA224</a></li><li><a href="sha224_checksum.html">SHA224 File</a></li><li><a href="sha256.html">SHA256</a></li><li><a href="sha256_checksum.html">SHA256 File</a></li><li><a href="double_sha256.html">Double SHA256</a></li></ol></nav></details><details><summary>SHA2-512</summary><nav><ol><li><a href="sha384.html">SHA384</a></li><li><a href="sha384_file_hash.html">SHA384 File</a></li><li><a href="sha512.html">SHA512</a></li><li><a href="sha512_file_hash.html">SHA512 File</a></li><li><a href="sha512_224.html">SHA512/224</a></li><li><a href="sha512_224_file_hash.html">SHA512/224 File</a></li><li><a href="sha512_256.html">SHA512/256</a></li><li><a href="sha512_256_file_hash.html">SHA512/256 File</a></li></ol></nav></details><details><summary>SHA3</summary><nav><ol><li><a href="sha3_224.html">SHA3-224</a></li><li><a href="sha3_224_checksum.html">SHA3-224 File</a></li><li><a href="sha3_256.html">SHA3-256</a></li><li><a href="sha3_256_checksum.html">SHA3-256 File</a></li><li><a href="sha3_384.html">SHA3-384</a></li><li><a href="sha3_384_checksum.html">SHA3-384 File</a></li><li><a href="sha3_512.html">SHA3-512</a></li><li><a href="sha3_512_checksum.html">SHA3-512 File</a></li></ol></nav></details><details><summary>Keccak</summary><nav><ol><li><a href="keccak_224.html">Keccak-224</a></li><li><a href="keccak_224_checksum.html">Keccak-224 File</a></li><li><a href="keccak_256.html">Keccak-256</a></li><li><a href="keccak_256_checksum.html">Keccak-256 File</a></li><li><a href="keccak_384.html">Keccak-384</a></li><li><a href="keccak_384_checksum.html">Keccak-384 File</a></li><li><a href="keccak_512.html">Keccak-512</a></li><li><a href="keccak_512_checksum.html">Keccak-512 File</a></li></ol></nav></details><details><summary>SHAKE</summary><nav><ol><li><a href="shake128/">SHAKE128</a></li><li><a href="shake128/file/">SHAKE128 File</a></li><li><a href="shake256/">SHAKE256</a></li><li><a href="shake256/file/">SHAKE256 File</a></li></ol></nav></details><details><summary>cSHAKE</summary><nav><ol><li><a href="cshake128/">cSHAKE128</a></li><li><a href="cshake128/file/">cSHAKE128 File</a></li><li><a href="cshake256/">cSHAKE256</a></li><li><a href="cshake256/file/">cSHAKE256 File</a></li></ol></nav></details><details><summary>KMAC</summary><nav><ol><li><a href="kmac128/">KMAC128</a></li><li><a href="kmac128/file/">KMAC128 File</a></li><li><a href="kmac256/">KMAC256</a></li><li><a href="kmac256/file/">KMAC256 File</a></li><li><a href="kmacxof128/">KMACXOF128</a></li><li><a href="kmacxof256/">KMACXOF256</a></li></ol></nav></details><details><summary>TupleHash</summary><nav><ol><li><a href="tuplehash128/">TupleHash128</a></li><li><a href="tuplehash256/">TupleHash256</a></li><li><a href="tuplehashxof128/">TupleHashXOF128</a></li><li><a href="tuplehashxof256/">TupleHashXOF256</a></li></ol></nav></details><details><summary>RIPEMD</summary><nav><ol><li><a href="ripemd-128/">RIPEMD-128</a></li><li><a href="ripemd-128/file/">RIPEMD-128 File</a></li><li><a href="ripemd-160/">RIPEMD-160</a></li><li><a href="ripemd-160/file/">RIPEMD-160 File</a></li><li><a href="ripemd-256/">RIPEMD-256</a></li><li><a href="ripemd-256/file/">RIPEMD-256 File</a></li><li><a href="ripemd-320/">RIPEMD-320</a></li><li><a href="ripemd-320/file/">RIPEMD-320 File</a></li></ol></nav></details><details><summary>BLAKE</summary><nav><ol><li><a href="blake2b/">BLAKE2b</a></li><li><a href="blake2b/file/">BLAKE2b File</a></li><li><a href="blake2s/">BLAKE2s</a></li><li><a href="blake2s/file/">BLAKE2s File</a></li><li><a href="blake3/">BLAKE3</a></li><li><a href="blake3/file/">BLAKE3 File</a></li></ol></nav></details></div><div class="section"><h3>Cryptography</h3><details><summary>AES</summary><nav><ol><li><a href="aes/encrypt/">Encryption</a></li><li><a href="aes/decrypt/">Decryption</a></li></ol></nav></details><details><summary>DES</summary><nav><ol><li><a href="des/encrypt/">Encryption</a></li><li><a href="des/decrypt/">Decryption</a></li></ol></nav></details><details><summary>Triple DES</summary><nav><ol><li><a href="triple-des/encrypt/">Encryption</a></li><li><a href="triple-des/decrypt/">Decryption</a></li></ol></nav></details><details><summary>RC4</summary><nav><ol><li><a href="rc4/encrypt/">Encryption</a></li><li><a href="rc4/decrypt/">Decryption</a></li></ol></nav></details><details><summary>XXTEA</summary><nav><ol><li><a href="xxtea/encrypt/">Encryption</a></li><li><a href="xxtea/decrypt/">Decryption</a></li></ol></nav></details><details><summary>SPECK</summary><nav><ol><li><a href="speck/encrypt/">Encryption</a></li><li><a href="speck/decrypt/">Decryption</a></li></ol></nav></details><details><summary>ECDSA</summary><nav><ol><li><a href="ecdsa/key-generator/">Key Generator</a></li><li><a href="ecdsa/sign/">Sign Message</a></li><li><a href="ecdsa/verify/">Verify Signature</a></li></ol></nav></details><details><summary>RSA</summary><nav><ol><li><a href="rsa/key-generator/">Key Generator</a></li><li><a href="rsa/sign/">Sign Message</a></li><li><a href="rsa/verify/">Verify Signature</a></li><li><a href="rsa/encrypt/">Encryption</a></li><li><a href="rsa/decrypt/">Decryption</a></li></ol></nav></details></div><div class="section"><h3>Compression</h3><details><summary>GZIP</summary><nav><ol><li><a href="gzip/create/">Create</a></li><li><a href="gzip/extract/">Extract</a></li><li><a href="gzip/compress/">Compress</a></li><li><a href="gzip/decompress/">Decompress</a></li></ol></nav></details><details><summary>DEFLATE</summary><nav><ol><li><a href="deflate/compress/">Compress</a></li><li><a href="deflate/decompress/">Decompress</a></li></ol></nav></details><details><summary>Brotli</summary><nav><ol><li><a href="brotli/create/">Create</a></li><li><a href="brotli/extract/">Extract</a></li><li><a href="brotli/compress/">Compress</a></li><li><a href="brotli/decompress/">Decompress</a></li></ol></nav></details><details><summary>Zstandard</summary><nav><ol><li><a href="zstandard/create/">Create</a></li><li><a href="zstandard/extract/">Extract</a></li><li><a href="zstandard/compress/">Compress</a></li><li><a href="zstandard/decompress/">Decompress</a></li></ol></nav></details><details><summary>XZ</summary><nav><ol><li><a href="xz/create/">Create</a></li><li><a href="xz/extract/">Extract</a></li><li><a href="xz/compress/">Compress</a></li><li><a href="xz/decompress/">Decompress</a></li></ol></nav></details><details><summary>ZIP</summary><nav><ol><li><a href="zip/create/">Create</a></li><li><a href="zip/extract/">Extract</a></li></ol></nav></details><details><summary>TAR</summary><nav><ol><li><a href="tar/create/">Create</a></li><li><a href="tar/extract/">Extract</a></li></ol></nav></details></div><div class="section"><h3>Encoding</h3><details><summary>Hex (Base16)</summary><nav><ol><li><a href="hex_encode.html">Encode</a></li><li><a href="hex_decode.html">Decode</a></li><li><a href="hex_encode_file.html">File to Hex</a></li><li><a href="hex_decode_file.html">Hex to File</a></li></ol></nav></details><details><summary>Base32</summary><nav><ol><li><a href="base32_encode.html">Encode</a></li><li><a href="base32_decode.html">Decode</a></li><li><a href="base32_encode_file.html">File to Base32</a></li><li><a href="base32_decode_file.html">Base32 to File</a></li></ol></nav></details><details><summary>Base58</summary><nav><ol><li><a href="base58/encode/">Encode</a></li><li><a href="base58/decode/">Decode</a></li><li><a href="base58/encode/file/">File to Base58</a></li><li><a href="base58/decode/file/">Base58 to File</a></li></ol></nav></details><details class="active" open><summary>Base64</summary><nav><ol><li><a href="base64_encode.html">Encode</a></li><li class="active"><a href="base64_decode.html">Decode</a></li><li><a href="base64_encode_file.html">File to Base64</a></li><li><a href="base64_decode_file.html">Base64 to File</a></li></ol></nav></details><details><summary>CBOR</summary><nav><ol><li><a href="cbor/encode/">Encode</a></li><li><a href="cbor/decode/">Decode</a></li></ol></nav></details><details><summary>HTML</summary><nav><ol><li><a href="html_encode.html">Encode</a></li><li><a href="html_decode.html">Decode</a></li></ol></nav></details><details><summary>URL</summary><nav><ol><li><a href="url_encode.html">Encode</a></li><li><a href="url_decode.html">Decode</a></li><li><a href="url/parser/">Parser</a></li></ol></nav></details><details><summary>JWT</summary><nav><ol><li><a href="jwt/decoder/">Decoder</a></li></ol></nav></details></div><div class="section"><h3>Format</h3><details><summary>JSON</summary><nav><ol><li><a href="json/validator/">Validator</a></li><li><a href="json/minifier/">Minifier</a></li><li><a href="json/formatter/">Formatter</a></li><li><a href="json/viewer/">Viewer</a></li><li><a href="json/compare/">Compare</a></li></ol></nav></details><details><summary>XML</summary><nav><ol><li><a href="xml/validator/">Validator</a></li><li><a href="xml/minifier/">Minifier</a></li><li><a href="xml/formatter/">Formatter</a></li></ol></nav></details></div><div class="section"><h3>Convert</h3><details><summary>Case</summary><nav><ol><li><a href="case/lower/">lower case</a></li><li><a href="case/upper/">UPPER CASE</a></li><li><a href="case/lower-camel/">lowerCamelCase</a></li><li><a href="case/upper-camel/">UpperCamelCase</a></li><li><a href="case/snake/">snake_case</a></li><li><a href="case/kebab/">kebab-case</a></li><li><a href="case/constant/">CONSTANT_CASE</a></li></ol></nav></details></div><div class="section"><h3>Generator</h3><details><summary>UUID</summary><nav><ol><li><a href="generator/uuid/v1/">UUID v1 Generator</a></li><li><a href="generator/uuid/v3/">UUID v3 Generator</a></li><li><a href="generator/uuid/v4/">UUID v4 Generator</a></li><li><a href="generator/uuid/v5/">UUID v5 Generator</a></li><li><a href="generator/uuid/v6/">UUID v6 Generator</a></li><li><a href="generator/uuid/v7/">UUID v7 Generator</a></li></ol></nav></details><details><summary>Password</summary><nav><ol><li><a href="generator/password/">Password Generator</a></li></ol></nav></details><details><summary>QR Code</summary><nav><ol><li><a href="qr-code/generator/">QR Code Generator</a></li></ol></nav></details></div><div class="section"><h3>Others</h3><details><summary>Others</summary><nav><ol><li><a href="text/compare/">Text Compare</a></li><li><a href="syntax-highlight/">Syntax Highlight</a></li></ol></nav></details></div><div class="section"><h3>Links</h3><nav class="links"><ol><li><a href="https://github.com/emn178/online-tools/issues">Contact</a></li></ol></nav></div></div></div><div id="content"><div class="top-nav"><button id="sidebar-toggler" aria-controls="sidebar" aria-expanded="false" aria-label="Menu"><img src="images/menu.svg" width="24" height="24" alt="Menu"></button></div><header><h1>Base64 Decode</h1></header><main><div class="tool-page"><details class="tool-description"><summary class="block-title"><span>Decode standard Base64, Base64URL, unpadded, IMAP-style, or custom-alphabet data to text or binary bytes online. Expand to read more.</span></summary><div class="tool-description-content"><h2 id="decode-base64-online">Decode Base64 online</h2>
<p>Base64 represents arbitrary bytes as printable text by mapping each six-bit value to one character. Standard Base64 and the URL-safe alphabet are specified by <a href="https://www.rfc-editor.org/rfc/rfc4648.html">RFC 4648</a>. This tool converts encoded text back to bytes and then displays those bytes using the selected output encoding.</p>
<h2 id="how-to-use-the-decoder">How to use the decoder</h2>
<p>Paste the encoded value and select Standard for the common <code>+/</code>, URL-safe <code>-_</code>, or IMAP-style <code>+,</code> alphabets. The standard decoder accepts omitted trailing padding and ignores CR/LF line wrapping. Choose Custom only when the source uses a different 64-character alphabet. Select UTF-8 for ordinary text or Hex to inspect exact binary bytes.</p>
<h2 id="example">Example</h2>
<p>The standard Base64 value <code>SGVsbG8=</code> decodes to <code>Hello</code> in UTF-8. The bytes <code>fbff</code> encode as <code>+/8=</code> in standard Base64 and <code>-_8=</code> in Base64URL; both are accepted by this page’s Standard decoder.</p>
<h2 id="important-limitations">Important limitations</h2>
<p>Base64 is encoding, not encryption, and provides no secrecy or integrity. This page rejects characters outside its supported alphabets except CR/LF. A valid Base64 string can still represent unsafe or non-text data, and decoding binary bytes as text can display replacement characters.</p>
<h2 id="frequently-asked-questions">Frequently asked questions</h2>
<h3 id="why-is-the-decoded-text-unreadable-">Why is the decoded text unreadable?</h3>
<p>The decoded bytes may use a different character encoding or may represent a file rather than text. Try Hex output to inspect the exact bytes, or use <a href="/online-tools/base64_decode_file.html">Base64 to File</a> to download them.</p>
<h3 id="is-base64url-the-same-as-base64-">Is Base64URL the same as Base64?</h3>
<p>It represents the same bytes but replaces <code>+</code> and <code>/</code> with <code>-</code> and <code>_</code>. Padding may be omitted when the surrounding specification permits it. Use <a href="/online-tools/base64_encode.html">Base64 Encode</a> to generate the required form.</p>
</div></details><div class="layout"><div class="layout-block"><div class="input"><div class="block block-fill"><div class="block-title">Input<div class="toolbar"><button class="icon" data-toggle="fullscreen"><img class="fullscreen-icon" src="images/fullscreen.svg" alt="Full Screen" title="Full Screen"><img class="fullscreen-icon-exit" src="images/fullscreen-exit.svg" alt="Full Screen" title="Full Screen"></button></div></div><textarea class="container" id="input" spellcheck="false" placeholder="Enter here..." data-remember="input" data-share="input" data-encoding-from="#input-type" data-mode-from="#input-mode" data-auto-update data-toggle="monacoEditor" style="word-break:break-all;"></textarea></div></div><div class="output"><div class="block block-fill"><div class="block-title">Output<div class="toolbar"><button class="icon" id="swap" onclick="swap('base64_encode.html', [['#output', '#input'], ['#output-type', '#input-type'], ['#format', '#format']])"><img src="images/swap.svg" alt="Swap" title="Swap"/></button><button class="icon" data-toggle="copy" data-clipboard-target="#output" data-message="Output copied"><img src="images/copy.svg" alt="Copy" title="Copy"/></button><button class="icon" data-toggle="fullscreen"><img class="fullscreen-icon" src="images/fullscreen.svg" alt="Full Screen" title="Full Screen"><img class="fullscreen-icon-exit" src="images/fullscreen-exit.svg" alt="Full Screen" title="Full Screen"></button></div></div><textarea class="container" id="output" spellcheck="false" placeholder="Output here..." data-encoding-from="#output-type" data-toggle="monacoEditor" readonly="readonly"></textarea></div><details class="block text-only" data-toggle="copyblock"><summary class="block-title">Share Link<div class="toolbar"><button class="icon" data-toggle="copy" data-clipboard-target="#share-link" data-message="Share link copied"><img src="images/copy.svg" alt="Copy" title="Copy"/></button></div></summary><input id="share-link" type="text" placeholder="Share Link" readonly="readonly"/></details></div></div><div class="settings"><div class="block block-fill"><div class="block-title">Settings</div><div class="container"><div class="setting"><a class="btn" id="execute">Decode</a></div><div class="setting"><label class="switcher"><input type="checkbox" value="1" id="auto-update" checked><div class="toggle"></div><span>Auto Update</span></label></div><div class="setting"><label class="switcher"><input type="checkbox" value="1" id="remember-input"><div class="toggle"></div><span>Remember Input</span></label></div><div class="setting"><label for="output-type">Output Encoding</label><select data-toggle="encoding" id="output-type" data-remember="output-type" data-share="output_type" data-auto-update><optgroup label="Binary"><option value="hex">Hex (Lower Case)</option><option value="hex_upper">Hex (Upper Case)</option><option value="base64" data-load-encoding="base64">Base64</option></optgroup><optgroup label="Text"><option value="utf-8" data-load-encoding="1" selected>UTF-8</option><option value="utf-16le" data-load-encoding="1">UTF-16LE</option><option value="utf-16be" data-load-encoding="1">UTF-16BE</option><option value="ibm866" data-load-encoding="2">IBM866</option><option value="iso-8859-2" data-load-encoding="2">ISO-8859-2</option><option value="iso-8859-3" data-load-encoding="2">ISO-8859-3</option><option value="iso-8859-4" data-load-encoding="2">ISO-8859-4</option><option value="iso-8859-5" data-load-encoding="2">ISO-8859-5</option><option value="iso-8859-6" data-load-encoding="2">ISO-8859-6</option><option value="iso-8859-7" data-load-encoding="2">ISO-8859-7</option><option value="iso-8859-8" data-load-encoding="2">ISO-8859-8</option><option value="iso-8859-8-i" data-load-encoding="2">ISO-8859-8-I</option><option value="iso-8859-10" data-load-encoding="2">ISO-8859-10</option><option value="iso-8859-13" data-load-encoding="2">ISO-8859-13</option><option value="iso-8859-14" data-load-encoding="2">ISO-8859-14</option><option value="iso-8859-15" data-load-encoding="2">ISO-8859-15</option><option value="iso-8859-16" data-load-encoding="2">ISO-8859-16</option><option value="koi8-r" data-load-encoding="2">KOI8-R</option><option value="koi8-u" data-load-encoding="2">KOI8-U</option><option value="macintosh" data-load-encoding="2">macintosh</option><option value="windows-874" data-load-encoding="2">Windows-874</option><option value="windows-1250" data-load-encoding="2">Windows-1250</option><option value="windows-1251" data-load-encoding="2">Windows-1251</option><option value="windows-1252" data-load-encoding="2">Windows-1252</option><option value="windows-1253" data-load-encoding="2">Windows-1253</option><option value="windows-1254" data-load-encoding="2">Windows-1254</option><option value="windows-1255" data-load-encoding="2">Windows-1255</option><option value="windows-1256" data-load-encoding="2">Windows-1256</option><option value="windows-1257" 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