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Formateador, Limpiador y Visor HTML

Formateo instantáneo, sangría limpia, eliminación de etiquetas, vista previa interactiva y conversión a PDF.

HTML Source Input
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Ahorrado:0.0% saved
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Diseñado para Ingeniería de Producción

Controles precisos, ejecución sin demoras y privacidad absoluta sin anuncios intrusivos.

Rendimiento con Web Worker

Procesa archivos de hasta 20MB en segundo plano sin congelar la interfaz ni bloquear pestañas.

Non-blocking UI→

CSS y JS Incrustados

Formatea automáticamente hojas de estilo <style> y lógica <script> junto con tus elementos HTML.

Full tag intelligence→

Minificación de Alta Calidad

Elimina espacios innecesarios y comentarios mostrando métricas inmediatas de bytes ahorrados.

Up to 40% reduction→

Vista Previa DOM Segura

Inspecciona el HTML en un iframe aislado y protegido sin riesgo de fugas de script.

Strict isolation→
100% Côté Client • Sin Envíos al Servidor

Privacidad por Diseño. Cero Telemetría.

Tu código nunca sale de tu ordenador. Todo el análisis y la compresión ocurren dentro de un Web Worker en tu navegador.

Embellecer HTMLPolítica de Privacidad

The Complete Guide to Clean Markup: HTML Formatter, HTML Stripper & HTML Viewer

In modern web development, source markup frequently passes through automated build pipelines, content management systems, edge caches, and minifiers. By the time a developer needs to inspect or debug a template, the markup is often compressed into a single unreadable line or bloated with legacy styling. A professional online html formatter, dedicated html stripper, and interactive html viewer online provide the essential toolkit to format HTML, analyze syntax, test visual rendering, and clean up source code instantly inside your browser.

CapacidadFormateador y EmbellecedorLimpiador HTML (Minificador)Visor de Código en VivoConvertidor HTML a PDF
Objetivo PrincipalIndent & beautify HTML code for human readabilityStrip comments & whitespace to shrink file sizeInspect live rendered DOM in a secure sandboxConvert HTML to PDF documents free
Estructura de SalidaHierarchical 2/4 spaces or tab indents with wrap rulesCondensed single-line or stripped lightweight streamRendered visual canvas with responsive breakpointsHigh-resolution vector PDF print output
Uso RecomendadoCode reviews, debugging templates, git diffsProduction builds, CDN distribution, faster TTFBEmail testing, component preview, CSS verificationInvoices, reports, offline documentation
Privacidad y Seguridad100% Client-Side Web WorkerZero server logging or telemetryStrict iframe sandbox isolationLocal browser PDF rendering engine

Why Format HTML Online with a Dedicated HTML Code Formatter?

HTML (HyperText Markup Language) is the structural backbone of every webpage. However, modern production websites often deliver markup that has been stripped of line breaks, tabs, and indentation to save network bandwidth. While this compression optimizes load times for end users, it makes debugging virtually impossible for developers. When you need to format html online, a robust html code formatter reconstructs the logical parent-child hierarchy of DOM nodes.

Using an online html formatter eliminates the guesswork from troubleshooting nested <div> wrappers, misaligned table rows, unclosed semantic tags, and runaway inline scripts. Rather than manually indenting thousands of lines, you paste your code, select your preferred indentation size (2 spaces, 4 spaces, or tabs), and click beautify html. Within milliseconds, our Web Worker parses the document and outputs clean, elegant, standards-compliant markup.

HTML Beautifier Online vs. HTML Stripper: Understanding the Balance

While developers use an html beautifier online to make code legible and maintainable, production engineering demands the opposite process: code stripping and compression. Our tool brings both disciplines into a unified workbench:

HTML Beautifier Engine

When you choose to beautify html online, the engine injects systematic whitespace, separates inline blocks, formats embedded <style> CSS and <script> JavaScript, wraps long attribute lists at custom line lengths (80, 100, or 120 characters), and preserves required spacing inside preformatted text areas. This makes your code review-ready for team collaboration and git pull requests.

High-Ratio HTML Stripper

As an html stripper, the engine strips developer comments (<!-- ... -->), collapses multiple tabs and returns into single spaces between HTML elements, removes redundant quotes on boolean attributes, and minifies inline CSS and JavaScript. This stripping process reduces document weight by up to 40%, boosting First Contentful Paint (FCP) and Time to First Byte (TTFB).

Real-Time HTML Viewer Online with Sandboxed HTML Preview

Code readability is only half the equation—developers also need to verify visual layout. Our built-in html viewer online and html code viewer allows you to inspect the rendered output instantly beside your source code. By switching from the code editor to the html preview mode, you activate a strictly isolated, sandboxed <iframe> container (sandbox="allow-same-origin").

This sandboxed architecture provides two immense advantages:

  • Security Isolation: Scripts embedded inside your inspected HTML cannot hijack parent session cookies, manipulate the application state, or leak proprietary tokens.
  • Multi-Device Testing: Use the preview viewport toggles to switch between Desktop (100%), Tablet (768px), and Mobile (375px) device widths, ensuring responsive layouts and HTML email templates render flawlessly across screen sizes.

How Does This Tool Compare with Notepad++ and VS Code HTML Formatters?

Many developers ask whether they should use a desktop editor extension or an online utility. While desktop tools have their place in long-term codebases, our web-based workbench addresses specific limitations found in popular code editors:

Notepad++ HTML Formatter (XML Tools / HTML Tidy)

The traditional notepad++ html formatter workflow requires downloading external plugins like XML Tools or TextFX, which frequently suffer from version incompatibilities, crash on Windows 64-bit builds with files over 5MB, or struggle with modern HTML5 void tags. Furthermore, Notepad++ offers zero native support for Mac or Linux developers. Our online tool requires zero installation, works across macOS, Windows, Linux, and mobile browsers, and processes files up to 20MB effortlessly via Web Workers.

VS Code HTML Formatter & Prettier Plugins

A standard vscode html formatter (like Prettier or Beautify extensions) requires a local workspace, Node.js dependencies, and configuration dotfiles (.prettierrc). When you are inspecting an external HTML payload, validating an email snippet on a client's device, or debugging on a machine without your IDE setup, launching an entire desktop IDE is cumbersome. This web workbench gives you instant access to code beautify html capabilities with zero setup.

Convert HTML to PDF Online Free: High-Fidelity Vector Document Export

A common downstream requirement when preparing HTML reports, invoices, email receipts, or academic documentation is converting the styled markup into a clean, portable PDF file. Searching for an html to pdf converter often leads to predatory SaaS tools that place watermarks over your pages or upload your sensitive documents to remote conversion servers.

Our built-in html to pdf converter online free allows you to convert html to pdf directly within your browser. By clicking the "PDF / Print" action in the output toolbar, your formatted HTML is rendered in a dedicated vector print context. Using your browser's native print engine, you can save crisp vector PDFs with selectable text, preserved font weights, sharp SVG graphics, and responsive print media queries—all without sending a single byte across the network.

Step-by-Step Guide: How to Format, Strip, View & Convert HTML

  1. Input Your Markup: Paste raw markup into the HTML Source Input panel, click Paste from Clipboard, drag and drop an .html file, or select a pre-loaded template (HTML5 Starter, Responsive Email, Tailwind Card).
  2. Choose Formatting Preferences: Select your preferred indentation (2 spaces, 4 spaces, or tabs) and set your desired line wrap width (None, 80, 100, or 120 characters).
  3. Format or Strip: Click Beautify HTML (or press Ctrl + Enter / ⌘↵) to beautify code, or click Minify HTML (or press Ctrl + Shift + M) to strip comments and collapse redundant whitespace.
  4. Inspect & Test: Switch to the Live Preview tab to test responsive breakpoints on Desktop, Tablet, and Mobile viewport frames.
  5. Export Your Code: Use Copy Output to transfer formatted code to your clipboard, click Download to save a clean .html file, or click PDF to convert HTML to PDF directly.
Ready to format HTML online?Clean, syntax-highlighted, completely free, and 100% private in your browser.
Start Formatting Now →
Knowledge Base & FAQ

Frequently Asked Questions

Detailed answers on HTML formatting, code beautification in VS Code and Notepad++, online HTML viewers, email backup conversion, and PDF exports.

how to convert backup email to html formatterPDF & Email Backup

To convert an email backup into clean, formatted HTML:

  1. Export Email File: Download your email backup as an .eml, .msg, or Mbox file from Gmail (via Google Takeout), Outlook, or Thunderbird.
  2. Extract the HTML Body: Open the .eml file in any text editor or email client. Locate the MIME HTML boundary section starting with Content-Type: text/html and copy the raw HTML markup within the <html>...</html> tags.
  3. Paste into HTML Formatter: Paste the copied markup into the htmlformater.com editor.
  4. Format & Beautify: Click Format HTML to automatically repair indentation, straighten nested email tables, and beautify inline styles. You can also switch to HTML Viewer to preview the rendered email across desktop and mobile views safely in a sandboxed iframe.
What is an HTML formatter?HTML Formatter & Beautifier

An HTML formatter (also known as an HTML beautifier or pretty printer) is a software utility that parses unformatted, minified, or disorganized HTML markup and reformats it with consistent indentation, proper tag nesting, standardized line breaks, and aligned element attributes. It transforms dense, single-line production code into clean, human-readable source code without modifying how the document renders in a web browser.

What is beautify in HTML?HTML Formatter & Beautifier

In HTML development, beautify refers to the automated process of re-structuring compressed or messy source code into an aesthetically pleasing, organized hierarchy. Beautifying adds standardized tab or space indentations for nested DOM elements, separates parent and child nodes onto distinct lines, tidies attribute spacing, and formats embedded <style> and <script> blocks while maintaining full browser execution integrity.

How to beautify code in HTML?HTML Formatter & Beautifier

You can beautify HTML code using multiple methods depending on your workflow:

  • Online with htmlformater.com: Paste your HTML into our free online formatter and click Format HTML for instant, zero-upload client-side beautification.
  • In VS Code: Open your HTML file and press Shift + Alt + F (Windows) or Shift + Option + F (macOS).
  • In Notepad++: Use the XML Tools plugin (Ctrl + Alt + Shift + B) or HTML Prettify plugin.
  • Via Command Line: Run automated CLI formatters like Prettier (npx prettier --write index.html) or js-beautify in your terminal.
What is the use of HTML format?HTML Formatter & Beautifier

Formatting HTML provides several key advantages for developers and teams:

  • Readability & Maintenance: Clean hierarchical indentation makes complex DOM trees and nested containers effortless to navigate.
  • Rapid Debugging: Instantly highlights missing closing tags, misaligned tables, or unclosed attribute quotes.
  • Version Control & Git Diffs: Eliminates false whitespace conflicts during team pull requests and code reviews.
  • SEO & Accessibility Auditing: Simplifies auditing heading hierarchies (<h1>–<h6>), semantic landmarks (<header>, <nav>, <main>), and ARIA attributes.
What does code beautify do?HTML Formatter & Beautifier

Code beautify transforms raw source code by parsing it into tokens and re-printing it according to strict language syntax rules. Specifically, it:

  • Applies standardized 2-space, 4-space, or tab indents for all nested children.
  • Splits consecutive tags and block-level elements onto individual lines.
  • Wraps oversized attribute lists at configurable column limits (80/100/120 characters).
  • Formats embedded CSS within <style> and JavaScript within <script> tags.
  • Normalizes quotation marks around attribute values while preserving functional output.
How can I beautify code in VS Code?VS Code Formatting

In Visual Studio Code, you can beautify code using any of these techniques:

  • Default Shortcut: Press Shift + Alt + F on Windows/Linux or Shift + Option + F on macOS.
  • Right-Click Menu: Right-click anywhere in the editor window and choose Format Document.
  • Command Palette: Press Ctrl + Shift + P (or Cmd + Shift + P), type Format Document, and press Enter.
  • Auto-Format on Save: Go to Settings (Ctrl + ,), search for Format On Save, and enable Editor: Format On Save.
What is an HTML viewer used for?HTML Viewer & Preview

An HTML viewer is used to preview and render HTML, CSS, and JavaScript code in real-time within a live browser viewport. It allows developers, content editors, and email marketers to:

  • Inspect how markup actually looks to visitors without saving files or deploying to a server.
  • Test responsive layouts across Desktop, Tablet, and Mobile viewport widths.
  • Safely preview third-party HTML snippets, email newsletters, or forum signatures in an isolated, sandboxed container.
  • Debug CSS styling and interactive layout bugs side-by-side with the underlying code.
Is there an HTML viewer?HTML Viewer & Preview

Yes, htmlformater.com/html-viewer provides a built-in, real-time HTML Viewer. It features an interactive dual-pane environment where you edit HTML on the left and see the rendered visual output update instantly on the right. It includes responsive viewport presets (Desktop 100%, Tablet 768px, Mobile 375px), full-screen expansion, and a secure sandbox container.

How do you view HTML?HTML Viewer & Preview

You can view HTML using three standard methods:

  1. In Any Web Browser (Rendered): Double-click any .html file on your computer to open it in Chrome, Safari, Firefox, or Edge.
  2. View Source Code in Browser: On any webpage, press Ctrl + U (Windows) or Cmd + Option + U (Mac) to view raw source markup, or press F12 to inspect elements with Chrome DevTools.
  3. In an Online HTML Viewer: Paste the code into htmlformater.com/html-viewer for simultaneous code editing and visual preview.
How to view HTML on mobile?HTML Viewer & Preview

To view HTML on an iPhone, iPad, or Android phone:

  • Use htmlformater.com in Mobile Browser: Open htmlformater.com in Safari or Chrome on your mobile device. Our responsive workspace allows you to paste, format, and preview HTML directly on your handset.
  • Open Local HTML Files: On Android, use the Files app to open .html files in Chrome. On iOS, save the HTML file to the Files app and tap it to view via Quick Look or Safari.
  • Mobile Code Editors: Apps such as Spck Code Editor (Android) or Koder / Textastic (iOS) let you inspect and edit HTML with built-in live mobile previews.
Is HTML Viewer online?HTML Viewer & Preview

Yes, htmlformater.com provides a 100% web-based online HTML Viewer. All HTML parsing, formatting, and live preview rendering run locally inside your browser via client-side Web Workers and sandboxed iframes. No data, private code, or email contents are ever transmitted to or stored on remote servers.

How to beautify HTML in Notepad++?Notepad++ Guide

To beautify HTML in Notepad++:

  1. Open Notepad++ and select Plugins from the top menu bar.
  2. Click Plugins Admin...
  3. In the Search box, type XML Tools.
  4. Check the checkbox next to XML Tools and click Install (Notepad++ will restart automatically).
  5. Open your HTML file, go to Plugins > XML Tools > Pretty print (XML only - with line breaks), or use the keyboard shortcut Ctrl + Alt + Shift + B.
How do I format HTML in Notepad++?Notepad++ Guide

Because Notepad++ does not have a native HTML beautifier out of the box, you format HTML by installing a dedicated plugin via Plugins > Plugins Admin:

  • XML Tools: Best for general XML/XHTML formatting (Ctrl + Alt + Shift + B).
  • HTML & CSS Prettify / Tidy2: Designed specifically for modern HTML5 markup and embedded styles.
  • Instant Online Alternative: If you do not want to install third-party plugins, copy your code, paste it into htmlformater.com, and click Format HTML for instant formatting.
Is Notepad++ for HTML?Notepad++ Guide

Yes, Notepad++ is a widely used, lightweight source code editor on Windows that supports HTML out of the box. It features syntax highlighting for HTML tags, attributes, and entities, automatic tag pairing, code folding, multi-line editing, and regex search-and-replace. While it lacks built-in HTML beautification without installing plugins, it is fast and efficient for editing HTML files.

Can I do HTML in VS Code?VS Code Formatting

Yes, Visual Studio Code (VS Code) is one of the most powerful and popular environments for HTML development. It comes with built-in Emmet abbreviations (e.g. typing ! and pressing Tab generates a full HTML5 boilerplate), intelligent auto-completion (IntelliSense), tag matching, built-in code formatting, CSS color pickers, and extensions like Live Server for real-time browser reloading.

How to enable formatter in VS Code?VS Code Formatting

To enable and configure an HTML formatter in VS Code:

  1. Open Settings by pressing Ctrl + , (Windows/Linux) or Cmd + , (macOS).
  2. In the search bar, type Default Formatter.
  3. Under Editor: Default Formatter, select HTML Language Features (built-in) or Prettier - Code formatter (if installed).
  4. To enable auto-formatting whenever you save, search for Format On Save and check the Editor: Format On Save checkbox.
How to beautify HTML in VS Code?VS Code Formatting

To beautify HTML in VS Code, open your HTML file and press Shift + Alt + F (Windows/Linux) or Shift + Option + F (macOS). Alternatively, right-click inside the document and choose Format Document. You can customize indentation spaces (2 or 4 spaces) in the bottom-right status bar or via your .vscode/settings.json configuration.

Which HTML to PDF converter is best?PDF & Email Backup

The best HTML to PDF converter depends on your specific use case:

  • Best Free Web-Based Tool: htmlformater.com/html-to-pdf converts HTML and CSS into high-resolution vector PDF documents entirely client-side in your browser, guaranteeing zero file uploads or data privacy risks.
  • Best for Automation & Developers: Puppeteer and Playwright (headless Chromium) offer pixel-perfect rendering of CSS Flexbox, Grid, web fonts, and dynamic JavaScript charts.
  • Best for Server-Side Templating: WeasyPrint (CSS Paged Media standard) and wkhtmltopdf (WebKit-based) for generating invoices and reports in backend pipelines.
How to convert HTML to PDF in Chrome?PDF & Email Backup

To convert any HTML file to PDF using Google Chrome:

  1. Open your HTML file in Chrome (drag and drop the file into a new tab or press Ctrl + O / Cmd + O).
  2. Press Ctrl + P (Windows) or Cmd + P (Mac) to open the Chrome Print dialog.
  3. In the Destination dropdown, choose Save as PDF.
  4. Under More settings, adjust Margins (Default or None) and check Background graphics to ensure CSS colors, gradients, and images appear in the PDF.
  5. Click Save and select your destination folder.
What is pdf/html format?PDF & Email Backup

While PDF and HTML are distinct file formats, the term pdf/html format typically refers to one of three workflows:

  • HTML-to-PDF Rendering: Generating print-ready, fixed-layout PDF documents using HTML and CSS templates (standard practice for digital receipts, invoices, and contracts).
  • Hybrid / Associated XML within PDF: Standard formats like PDF/A-3 or PDF/UA that encapsulate semantic HTML or XML data inside an archival PDF container for accessibility and electronic data interchange.
  • Web-Optimized PDF: Exporting web content as selectable, vector-based PDF files that preserve active hyperlinks, searchable typography, and high-resolution graphics.