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HTML Live Previewer - Online Code to Rendered View

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HTML Live Previewer
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Frequently Asked Questions

An HTML Live Previewer is an online tool that lets you write HTML, CSS, and JavaScript code and instantly see the rendered output in a live preview panel. It's ideal for rapid prototyping, testing code snippets, learning web development, and debugging markup without needing to save files or set up a local server. The preview updates in real-time as you type (when Auto-Run is enabled), giving you immediate visual feedback.
Yes! You can include <style> tags for CSS and <script> tags for JavaScript directly in your HTML code. The preview iframe renders the complete HTML document, so embedded stylesheets, inline styles, external CSS via <link>, and JavaScript all work as they would in a regular browser. This makes it perfect for testing full interactive components, animations, form validation, and more.
Yes, your code is automatically saved to your browser's local storage. If you close the page and come back later, your last work will be restored. However, clearing your browser data or using private/incognito mode will prevent this persistence. For important work, we recommend using the Download button to save a local HTML file as a backup.
Simply click the Download button () in the toolbar. This generates an .html file containing your code and triggers a browser download. You can then open this file directly in any web browser, edit it in a code editor, or upload it to a web server. It's a convenient way to save your work locally.
The preview iframe renders your HTML at full width within the preview panel. To test responsive designs, you can include CSS media queries in your code and resize the preview panel by dragging the divider handle. The preview will respond to the available width just like a browser window would. For dedicated mobile testing, consider using browser developer tools alongside this tool.
Common HTML mistakes include: unclosed tags (e.g., missing </div>), mismatched quotation marks in attributes, incorrect nesting of elements, missing <!DOCTYPE html> declaration, typos in tag names, and forgetting to close void elements properly. The live preview helps catch these errors quickly since broken markup often produces unexpected visual results. Using the Auto-Run feature lets you spot issues as you type.
Yes, this HTML Live Previewer is completely free to use. There are no usage limits, no account registration required, and no paywalls. All processing happens locally in your browser — your code never leaves your device. It's designed as a lightweight, accessible tool for developers, students, and anyone learning web technologies.
While this tool doesn't have a built-in sharing feature, you can easily share your code by using the Copy button to copy the full HTML to your clipboard, then paste it into an email, chat, or code-sharing platform like GitHub Gist, CodePen, or JSFiddle. Alternatively, download the HTML file and share it directly. For collaborative work, those dedicated platforms may offer better versioning and real-time collaboration features.
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Order IDCustomerProductAmountStatus
#ORD-001Alice JohnsonWireless Mouse$29.99Active
#ORD-002Bob SmithMechanical Keyboard$89.50Active
#ORD-003Carol WhiteUSB-C Hub$45.00Pending
#ORD-004David LeeMonitor Stand$62.30Cancelled
#ORD-005Eva MartinezWebcam HD$55.99Active
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` }; // ============ INIT ============ function init() { // Restore saved code const savedCode = localStorage.getItem(STORAGE_KEY); if (savedCode !== null && savedCode.trim() !== '') { $editor.val(savedCode); } else { $editor.val(samples.hello); } updateCounts(); updatePreview(); // Restore split position const savedSplit = localStorage.getItem(SPLIT_STORAGE_KEY); if (savedSplit && window.innerWidth >= 768) { $editorPanel.css('width', savedSplit); } // Hide placeholder if preview has content if ($editor.val().trim()) { $previewPlaceholder.hide(); } } // ============ UPDATE PREVIEW ============ function updatePreview() { const code = $editor.val(); const iframe = $previewFrame[0]; if (iframe) { iframe.srcdoc = code; } $previewPlaceholder.hide(); lastUpdateTime = Date.now(); updateStatus('synced', 'Preview updated'); } function updateCounts() { const code = $editor.val(); const lines = code.split('\n').length; const chars = code.length; $lineCount.text(lines); $charCount.text(chars); } function updateStatus(state, text) { $statusDot.removeClass('synced pending').addClass(state); $statusText.text(text); } function setPendingStatus() { $statusDot.removeClass('synced pending').addClass('pending'); $statusText.text('Waiting...'); } // ============ DEBOUNCED AUTO-RUN ============ function schedulePreviewUpdate() { if (!autoRunEnabled) return; setPendingStatus(); clearTimeout(debounceTimer); debounceTimer = setTimeout(function() { updatePreview(); updateCounts(); saveCode(); }, DEBOUNCE_MS); } function saveCode() { try { localStorage.setItem(STORAGE_KEY, $editor.val()); } catch(e) { // Storage full or unavailable } } // ============ EVENT HANDLERS ============ $editor.on('input', function() { updateCounts(); schedulePreviewUpdate(); }); $editor.on('keydown', function(e) { // Tab key inserts spaces if (e.key === 'Tab') { e.preventDefault(); const textarea = this; const start = textarea.selectionStart; const end = textarea.selectionEnd; const before = textarea.value.substring(0, start); const after = textarea.value.substring(end); textarea.value = before + ' ' + after; textarea.selectionStart = textarea.selectionEnd = start + 2; // Trigger input event manually $(textarea).trigger('input'); } // Ctrl+Enter to run if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') { e.preventDefault(); updatePreview(); updateCounts(); saveCode(); } }); $autoRunToggle.on('change', function() { autoRunEnabled = this.checked; if (autoRunEnabled) { updatePreview(); updateCounts(); saveCode(); updateStatus('synced', 'Auto-run enabled'); } else { updateStatus('synced', 'Auto-run paused'); } }); $btnRun.on('click', function() { clearTimeout(debounceTimer); updatePreview(); updateCounts(); saveCode(); updateStatus('synced', 'Manual run complete'); // Brief button feedback $btnRun.addClass('btn-success').removeClass('btn-primary'); setTimeout(function() { $btnRun.addClass('btn-primary').removeClass('btn-success'); }, 400); }); $btnCopy.on('click', function() { const code = $editor.val(); if (navigator.clipboard && navigator.clipboard.writeText) { navigator.clipboard.writeText(code).then(function() { showCopyFeedback(); }).catch(function() { fallbackCopy(code); }); } else { fallbackCopy(code); } }); function fallbackCopy(text) { const temp = $('