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<a href="https://base64decodeonl.com/"><img class="c_logo" src="https://base64decodeonl.com/themes/hp/img/decode-logo.png" /></a>
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<a href="https://base64decodeonl.com/"><em class="c_btn_decode">Base64 Decode</em></a>
<a rel="nofollow" href="https://base64encodeonl.com"><em class="c_btn_encode">Base64 Encode</em></a>
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<h1>Base64 Decode</h1>
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<p style="color: #606060">Simply input your data and click the "Decode" button.</p>
<p style="color: #606060">Convert a Base64 string from "YmFzZTY0IGRlY29kZQ==" to "base64 decode" effortlessly.</p>
<p class="line_break"></p>
<form action="https://base64decodeonl.com/" accept-charset="UTF-8" method="post" id="frm_editor_inp">
<p><em class="btn_loadfile" onclick="btn_loadfile_inp();">Load File<i class="fa fa-folder-open" data-action="loadfile"></i></em></p>
<div class="editor-container" id="edt_inp_container">
<div class="editor-header">
<div class="header-title">Input :</div>
<div class="header-icons">
<i class="fa fa-folder-open" data-action="loadfile"></i>
<i class="fa fa-trash" data-action="clear"></i>
<i class="fa fa-copy" data-action="copy"></i>
<i class="fa fa-arrows-alt-v" data-action="resize"></i>
<i class="fa fa-expand" data-action="expand"></i>
</div>
</div>
<input type="file" id="edt_inp_loadfile" style="display: none;">
<input type="hidden" name="obj_edt_inp_editorcontent" id="edt_inp_editorcontent">
<div class="edt_content" id="edt_inp"></div>
</div>
<p style="display: none;">
<label class="lb_checkbox"><input type="checkbox" name="obj_chk_safeurl" id="chk_safeurl">Enable URL-safe encoding using the Base64URL format.</label>
</p>
<p style="display: none;" >
<label class="lb_checkbox"><input type="checkbox" name="obj_chk_setbookmark" id="chk_setbookmark" checked>Bookmark(Private for you).</label>
</p>
<p style="margin-top: 5px;">
<label class="lb_checkbox"><input type="checkbox" name="obj_chk_setliveaction" id="chk_setliveaction">Live action(Decode in real-time).</label>
</p>
<p>
<button type="submit" id="submit_text" class="btn_decode">Decode<i class="fas fa-terminal"></i></button>
</p>
</form>
<div class="editor-container" id="edt_out_container">
<div class="editor-header">
<div class="header-title">Output :</div>
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<i class="fa fa-trash" data-action="clear"></i>
<i class="fa fa-copy" data-action="copy"></i>
<i class="fa fa-arrows-alt-v" data-action="resize"></i>
<i class="fa fa-expand" data-action="expand"></i>
</div>
</div>
<div class="edt_content" id="edt_out"></div>
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<p><em class="btn_copyoutput" onclick="btn_copycontent_outp();">Copy to clipboard(output)<i class="fa fa-copy"></i></em></p>
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<script src="https://base64decodeonl.com/themes/hp/js/handle_page_home.js"></script>
<script>
initEditor("edt_inp");
handleEditorActions("edt_inp_container", "edt_inp" , "edt_inp_loadfile");
initEditor("edt_out");
handleEditorActions("edt_out_container", "edt_out");
//handle control
//btn loadfile in input
function btn_loadfile_inp() {
const btn_loadfile = document.querySelector("#edt_inp_container [data-action='loadfile']");
if (btn_loadfile) {
btn_loadfile.click();
}
/* else { alert("Its not isset"); } */
}
function btn_copycontent_outp() {
const btn_copycontent = document.querySelector("#edt_out_container [data-action='copy']");
if (btn_copycontent) {
btn_copycontent.click();
}
}
/*
function getContentEditor(editorId) {
content_temp = editors[editorId].getValue();
alert('📜 Nội dung trong editor:\n\n' + content_temp);
}
*/
document.getElementById("frm_editor_inp").addEventListener("submit", function (e) {
const editorValue = editors["edt_inp"].getValue(); // get content edt_inp
document.getElementById("edt_inp_editorcontent").value = editorValue; // set input hidden
});
function normalizebase64(base64) {
base64 = base64.replace(/[^A-Za-z0-9+/=]/g, '');
base64 = base64.replace(/=+$/, '');
while (base64.length % 4 !== 0) {
base64 += '=';
}
return base64;
}
function decodeline(line, urlSafe) {
let decoded = "[Error decode Base64]";
try {
let base64 = line.trim();
if (urlSafe) {
base64 = base64.replace(/-/g, '+').replace(/_/g, '/');
}
base64 = normalizebase64(base64);
decoded = atob(base64);
} catch (e) {
}
return decoded;
}
function decodeallline(input) {
return input
.split("\n")
.map(line => decodeline(line.trim(), true))
.join("\n");
}
const live_edt_inp = document.getElementById("edt_inp");
const live_chk_setliveaction = document.getElementById("chk_setliveaction");
function handleLiveDecode() {
if (live_chk_setliveaction.checked) {
const liveinput = editors["edt_inp"].getValue();
const liveoutput = decodeallline(liveinput);
editor_setcontent("edt_out", liveoutput);
}
}
//live_edt_inp.addEventListener("input", handleLiveDecode);
editors["edt_inp"].getSession().on("change", handleLiveDecode);
live_chk_setliveaction.addEventListener("change", handleLiveDecode);
</script>
<div class="c_panel_about">
<h2>Overview - Decode Base 64</h2>
<div class="c_panel_about_div">
<h3>Introducing Base64 Decode and Encode</h3>
<p>Meet Base64 Decode and Encode, a powerful yet simple online tool designed to efficiently encode and decode Base64 data. Whether you need to transform data into Base64 format or decode it back into a human-readable form, our tool makes the process seamless and hassle-free.</p>
<h3>Why Use Base64 Decoding?</h3>
<p>Base64 decoding is essential for retrieving binary data that has been encoded to ensure safe storage and transmission. This process maintains data integrity and allows accurate reconstruction. It is widely used in applications such as email communication via MIME, as well as in data formats like XML and JSON.</p>
<h3>Key Features</h3>
<p><b>Character Set Compatibility</b></p>
<p>Our platform defaults to the UTF-8 character set, ensuring precise data conversion. If your encoded data originates from a different character set, you can manually select the correct one before decoding. Since Base64 encoding does not inherently store character set information, choosing the appropriate format is crucial for accurate results. For file uploads, the default binary option prevents unnecessary conversions, ensuring proper handling of all non-text documents.</p>
<br>
<p><b>Newline Handling</b></p>
<p>Different operating systems use varying line break characters. Before decoding, our tool standardizes these breaks based on your chosen settings. While this feature is not critical for file decoding, it enhances accuracy when processing text-based data.</p>
<br>
<p><b>Decoding Options</b></p>
<p><b>+ Decode Each Line Separately:</b> This option enables the decoding of multiple Base64-encoded lines individually. It is particularly useful when handling structured data with separate encoded segments (not compatible with the split-line reconstruction feature).</p>
<br>
<p><b>+ Reconstruct Split Lines:</b> Base64-encoded data is often stored as continuous text. Activating this option ensures that multi-line encoded data is accurately reconstructed following MIME (RFC 2045) specifications, which dictate a 76-character line limit (not compatible with the separate line decoding feature).</p>
<br>
<p><b>+ Handle URL-Safe Encoding:</b> Some Base64 variations replace "+", "/", and "=" with URL-friendly characters like "-" and "_" to make them more suitable for web applications. Enabling this feature ensures proper decoding of such formats (RFC 4648 / Base64URL), restoring the original characters.</p>
<br>
<p><b>+ Live Mode:</b> This setting enables real-time decoding using your browser’s built-in JavaScript functionality, ensuring immediate results without transmitting data to our servers. Currently, this mode supports only UTF-8 decoding.</p>
<h3>Security and Privacy</h3>
<p>Your data security is our priority. All communications with our servers are protected by SSL encryption (HTTPS). Uploaded files are automatically deleted after processing, and downloadable content is removed immediately after the first download attempt or after 15 minutes of inactivity—whichever occurs first. We do not store, inspect, or retain any submitted data or uploaded files. For further details, refer to our privacy policy.</p>
<h3>100% Free to Use</h3>
<p>Our Base64 decoding tool is completely free. No software installation is required—decode your data instantly online without hassle.</p>
<h3>Understanding Base64 Decoding</h3>
<p>Base64 decoding is the process of converting Base64-encoded data back into its original text or binary format. This technique is essential for reconstructing data that has been encoded for secure transmission and storage. Originally developed as a MIME content-transfer encoding, Base64 remains an integral part of modern digital applications.</p>
<br>
<p>Experience effortless, secure, and efficient Base64 decoding—try our tool today!</p>
<br><br>
<img src="https://base64decodeonl.com/themes/hp/img/source-decode-wk.png" />
</div>
</div> </div>
<div class="c_content_right">
<div class="c_panel_func">
<h2>Base64 Decode - functions code</h2>
<div class="c_panel_func_item">
<span> </span>
<h3>
<a class="text-nowrap" href="https://base64decodeonl.com/fundcode-php-base64-decode" title="PHP : base64_decode(String)">PHP : base64_decode(String)</a>
</h3>
</div>
<div class="c_panel_func_item">
<span> </span>
<h3>
<a class="text-nowrap" href="https://base64decodeonl.com/fundcode-python-base64-b64decode" title="Python : base64.b64decode(String)">Python : base64.b64decode(String)</a>
</h3>
</div>
<div class="c_panel_func_item">
<span> </span>
<h3>
<a class="text-nowrap" href="https://base64decodeonl.com/fundcode-perl-decode-base64" title="Perl : decode_base64(String)">Perl : decode_base64(String)</a>
</h3>
</div>
<div class="c_panel_func_item">
<span> </span>
<h3>
<a class="text-nowrap" href="https://base64decodeonl.com/fundcode-vb-system-convert-frombase64string" title="VB : System.Convert.FromBase64String(String)">VB : System.Convert.FromBase64String(String)</a>
</h3>
</div>
<div class="c_panel_func_item">
<span> </span>
<h3>
<a class="text-nowrap" href="https://base64decodeonl.com/fundcode-c-sharp-system-convert-frombase64string" title="C# : System.Convert.FromBase64String(String)">C# : System.Convert.FromBase64String(String)</a>
</h3>
</div>
<div class="c_panel_func_item">
<span> </span>
<h3>
<a class="text-nowrap" href="https://base64decodeonl.com/fundcode-java-decode" title="Java : Base64.getDecoder().decode(String)">Java : Base64.getDecoder().decode(String)</a>
</h3>
</div>
<div class="c_panel_func_item">
<span> </span>
<h3>
<a class="text-nowrap" href="https://base64decodeonl.com/fundcode-go-golang-base64-stdencoding-decodestring" title="GO(golang) : base64.StdEncoding.DecodeString(String)">GO(golang) : base64.StdEncoding.DecodeString(String)</a>
</h3>
</div>
<div class="c_panel_func_item">
<span> </span>
<h3>
<a class="text-nowrap" href="https://base64decodeonl.com/fundcode-ruby-base64-decode64" title="Ruby : Base64.decode64(String)">Ruby : Base64.decode64(String)</a>
</h3>
</div>
<div class="c_panel_func_item">
<span> </span>
<h3>
<a class="text-nowrap" href="https://base64decodeonl.com/fundcode-mysql-from-base64" title="MySQL : FROM_BASE64(String)">MySQL : FROM_BASE64(String)</a>
</h3>
</div>
<div class="c_panel_func_item">
<span> </span>
<h3>
<a class="text-nowrap" href="https://base64decodeonl.com/fundcode-javascript-atob" title="JavaScript : atob(String)">JavaScript : atob(String)</a>
</h3>
</div>
</div> </div>
</div>
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