XML Formatter: Format, Beautify & Validate XML Files Easily 2025

XML Formatter

This XML Formatter tool helps you beautify and format XML data with proper indentation and structure. It makes XML code more readable and easier to understand by organizing elements hierarchically.

How to use: Paste your XML code below, select formatting options, and click “Format XML” to beautify or “Minify” to compress. Errors will be shown if XML is invalid.

Paste your XML code:

<div class="indent-option">
        <label for="indentSize">Indent Size:</label>
        <select id="indentSize" class="form-control">
          <option value="2">2 spaces</option>
          <option value="4" selected>4 spaces</option>
          <option value="8">8 spaces</option>
          <option value="tab">Tab</option>
        </select>
      </div>

<div class="indent-option">
        <label for="newlineOption">Newline:</label>
        <select id="newlineOption" class="form-control">
          <option value="lf" selected>LF (Unix)</option>
          <option value="crlf">CRLF (Windows)</option>
        </select>
      </div>
    </div>

<div>
      <button id="formatBtn" class="btn-format">Format XML</button>
      <button id="minifyBtn" class="btn-minify">Minify XML</button>
    </div>
  </div>

<div id="resultContainer" class="result-container">
    <div id="validationResult"></div>
    <div id="codeOutput" class="code-output"></div>
    <button id="copyBtn" class="copy-btn">Copy to Clipboard</button>
  </div>

const formatBtn = container.querySelector('#formatBtn');
      const minifyBtn = container.querySelector('#minifyBtn');
      const copyBtn = container.querySelector('#copyBtn');
      const xmlInput = container.querySelector('#xmlInput');
      const validationResult = container.querySelector('#validationResult');
      const codeOutput = container.querySelector('#codeOutput');
      const resultContainer = container.querySelector('#resultContainer');

formatBtn.addEventListener('click', () => processXml(false));
      minifyBtn.addEventListener('click', () => processXml(true));
      copyBtn.addEventListener('click', copyToClipboard);

function processXml(minify) {
        const xml = xmlInput.value.trim();
        if (!xml) {
          alert('Please enter some XML code');
          return;
        }
        clearResults();

try {
          const parser = new DOMParser();
          const xmlDoc = parser.parseFromString(xml, 'text/xml');
          const parseError = xmlDoc.getElementsByTagName('parsererror');

if (parseError.length) {
            throw new Error(parseError[0].textContent);
          }

const indentSize = container.querySelector('#indentSize').value;
          const newlineOption = container.querySelector('#newlineOption').value;

let formattedXml;
          if (minify) {
            formattedXml = minifyXml(xml);
          } else {
            let indent = indentSize === 'tab' ? '\t' : ' '.repeat(parseInt(indentSize));
            let newline = newlineOption === 'crlf' ? '\r\n' : '\n';
            formattedXml = formatXml(xml, indent, newline);
          }

validationResult.className = 'validation-result validation-success';
          validationResult.innerHTML = '<strong>Valid XML!</strong> Your XML is correctly formatted.';

codeOutput.innerHTML = highlightXml(escapeHtml(formattedXml));
          resultContainer.style.display = 'block';
        } catch (err) {
          validationResult.className = 'validation-result validation-error';
          validationResult.innerHTML = `<strong>Invalid XML:</strong> ${err.message}`;
          codeOutput.textContent = xml;
          resultContainer.style.display = 'block';
        }
      }

function formatXml(xml, indent, newline) {
        let formatted = xml.replace(/>\s*</g, '><');
        let indentLevel = 0;
        let result = '';
        let inTag = false;
        let inComment = false;
        let inCDATA = false;

for (let i = 0; i < formatted.length; i++) {
          const char = formatted.charAt(i);

if (inComment) {
            result += char;
            if (i > 1 && char === '>' && formatted.charAt(i - 1) === '-' && formatted.charAt(i - 2) === '-') {
              inComment = false;
              result += newline;
            }
            continue;
          }

if (inCDATA) {
            result += char;
            if (i > 2 && char === '>' && formatted.charAt(i - 1) === ']' && formatted.charAt(i - 2) === ']') {
              inCDATA = false;
            }
            continue;
          }

if (i < formatted.length - 3 && char === '<' && formatted.charAt(i + 1) === '!' &&
              formatted.charAt(i + 2) === '-' && formatted.charAt(i + 3) === '-') {
            inComment = true;
            result += newline + indent.repeat(indentLevel) + char;
            continue;
          }

if (i < formatted.length - 8 && char === '<' && formatted.charAt(i + 1) === '!' &&
              formatted.substring(i + 2, i + 9) === '[CDATA[') {
            inCDATA = true;
            result += char;
            continue;
          }

if (char === '<' && formatted.charAt(i + 1) !== '/') {
            result += newline + indent.repeat(indentLevel) + char;
            indentLevel++;
            inTag = true;
          } else if (char === '<' && formatted.charAt(i + 1) === '/') {
            indentLevel--;
            if (!inTag) {
              result += newline + indent.repeat(indentLevel);
            }
            result += char;
            inTag = true;
          } else if (char === '>') {
            result += char;
            inTag = false;
          } else {
            result += char;
          }
        }
        return result.trim();
      }

function minifyXml(xml) {
        let minified = xml.replace(//g, '');
        minified = minified.replace(/>\s*</g, '><');
        minified = minified.replace(/^\s+|\s+$/gm, '');
        minified = minified.replace(/\s*=\s*/g, '=');
        return minified;
      }

function highlightXml(xml) {
        let highlighted = xml.replace(/(<\/?)([a-zA-Z0-9:_.-]+)(?=[^>]*>)/g, '$1<span class="xml-tag">$2</span>');
        highlighted = highlighted.replace(/\s([a-zA-Z0-9:_.-]+)=("|')([^"']*?)(\2)/g, ' <span class="xml-attr-name">$1</span>=<span class="xml-attr-value">$2$3$4</span>');
        highlighted = highlighted.replace(/(<!--)([\s\S]*?)(--)>/g, '<span class="xml-comment">$1$2$3></span>');
        highlighted = highlighted.replace(/(<!\[CDATA\[)([\s\S]*?)(\]\])>/g, '<span class="xml-cdata">$1$2$3></span>');
        return highlighted;
      }

function escapeHtml(unsafe) {
        return unsafe.replace(/&/g, "&").replace(/</g, "<").replace(/>/g, ">").replace(/"/g, """).replace(/'/g, "'");
      }

function clearResults() {
        validationResult.textContent = '';
        codeOutput.textContent = '';
        resultContainer.style.display = 'none';
      }
    })();
  </script>
</div>

<p></p>

<h2 class="wp-block-heading"><strong>Introduction</strong></h2>

<p>XML files are used for data storage, configuration, and info sharing. Raw XML can be hard to read and error-prone, so an XML formatter cleans it up. If you work with XML, using a formatter can save time, reduce mistakes, and improve productivity.</p>

<h2 class="wp-block-heading">So, What’s an XML Formatter?</h2>

<p>It’s like a tool that tidies up XML code by indenting and aligning tags. This makes the structure clear and helps XML work better with parsers and applications.</p>

<h2 class="wp-block-heading">Main Perks:</h2>

<ul class="wp-block-list">
<li>Improves XML code readability.</li>

<li>Spots syntax errors.</li>

<li>Validates XML against DTD/XSD.</li>

<li>Simple copy-paste function.</li>
</ul>

<h2 class="wp-block-heading">Why Bother Using One?</h2>

<ul class="wp-block-list">
<li>XML readability is improved through formatters that structure the data, making it easier to understand.</li>

<li>Correct formatting helps <strong><a href="https://codeshack.io/xml-formatter/" data-type="link" data-id="https://codeshack.io/xml-formatter/" target="_blank" rel="noopener">reduce errors by finding missing tags</a></strong> and fixing misplaced elements early.</li>

<li>Proper formatting saves time and allows teams to read files easier & maintain consistency.</li>
</ul>

<p></p>

<div class="wp-block-media-text is-stacked-on-mobile"><figure class="wp-block-media-text__media"><img fetchpriority="high" fetchpriority="high" decoding="async" width="1024" height="576" src="https://toolsvista.online/wp-content/uploads/2025/10/image_1765260038853.webp_image-1024x576.png" alt="" class="wp-image-626 size-full" srcset="https://toolsvista.online/wp-content/uploads/2025/10/image_1765260038853.webp_image-1024x576.png 1024w, https://toolsvista.online/wp-content/uploads/2025/10/image_1765260038853.webp_image-300x169.png 300w, https://toolsvista.online/wp-content/uploads/2025/10/image_1765260038853.webp_image-768x432.png 768w, https://toolsvista.online/wp-content/uploads/2025/10/image_1765260038853.webp_image.png 1280w" sizes="(max-width: 1024px) 100vw, 1024px" /></figure><div class="wp-block-media-text__content">
<p>YouTube Channel Analyzer: Boost Your Channel Growth Fast 2025</p>

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<p></p>

<p>Just copy, paste, and click Format to clean up your XML. Then, review the changes and grab the formatted code for your project. Many online tools also check XML validity.</p>

<h2 class="wp-block-heading">Some Quick Tips</h2>

<ul class="wp-block-list">
<li>Always close your tags.</li>

<li>Keep indentation consistent (2–4 spaces).</li>

<li>Remove unnecessary blank lines.</li>

<li>Validate your code before saving or sharing.</li>

<li>Use online tools to validate large files.</li>
</ul>

<h2 class="wp-block-heading">In short:</h2>

<p>If you work with XML, a formatter is essential. It improves readability, reduces mistakes, and boosts efficiency, keeping your XML files organized and manageable.</p>

<p>Use our free XML formatter today! Start cleaning up your XML right away.</p>

<div class="custom-css-block"><style>#aab_accordion_db3451e6_0 {  }</style></div><div class="wp-block-aab-accordion-block aab__accordion_container  accessibilityOn" style="margin-top:0px;margin-bottom:15px;border:1px solid #bcb6b638" id="aab_accordion_db3451e6_0" role="button" aria-expanded="false" tabindex="0"><div class="aab__accordion_head aab_right_icon " style="background-color:#bcb6b638;border-top:none;border-right:none;border-bottom:none;border-left:none"><div class="aab__accordion_heading aab_right_icon aab_right_link"><div class="head_content_wrapper"><div class="title_wrapper"><h5 class="aab__accordion_title" style="margin:0"><strong><strong><strong><strong>Can I use it offline?</strong> </strong></strong></strong></h5></div></div></div><div class="aab__accordion_icon" style="border:0px solid transparent"><span class="aab__icon dashicons dashicons-plus-alt2" style="font-size:23px"></span></div></div><div class="aab__accordion_body  " role="region" style="display:none;border-top:1px solid #bcb6b638;border-right:none;border-bottom:none;border-left:none"><div class="aab__accordion_component">
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