HTML Viewer - HTML, JS, CSS Editor and Runner

You open your browser, type a URL, and wait. The page loads, but the layout is broken. A script didn’t fire. A CSS rule didn’t apply. You need to know why—instantly, without leaving your phone. HTML Viewer - HTML, JS, CSS Editor and Runner turns your Android device into a portable web development sandbox. Write, edit, and execute front-end code in real time, inspect the DOM, and debug rendering, all from a single interface that requires no server or internet connection to run.

Core Editor and Execution Engine

The app provides a multi‑tab editor supporting HTML, CSS, and JavaScript simultaneously. Each language gets its own syntax‑highlighted pane with line numbers and auto‑indentation. The integrated WebView‑based renderer executes your code instantly—every keystroke triggers a live preview update. You can toggle between Edit and Preview modes, or split the screen to watch changes as you type. The editor supports Undo/Redo stacks and external file imports from device storage, allowing you to load existing .html, .css, or .js files directly.

Key Functionalities and Tools

• Live Preview with Console Logging – See rendered output in a dedicated pane while JavaScript errors and console.log() messages appear in a scrollable log panel below the editor.
• DOM Inspector Integration – Tap any element in the preview to highlight its source code in the editor, enabling rapid element‑targeted debugging.
• Built‑in Snippet Library – Access a collection of pre‑written code templates (responsive grid, flexbox layout, form validation, AJAX call) to jump‑start new projects.
• File Manager with Export – Save projects as single .html files or as bundled archives. Export directly to email, cloud storage, or share via nearby devices.
• Customizable Editor Theme – Switch between light, dark, and high‑contrast themes to reduce eye strain during extended coding sessions.

Advantages Over Mobile Browsers

Unlike generic browser developer tools, this app operates fully offline for local files. No network request is made when you edit and preview code stored on your device. The persistent session preserves your last open project across app restarts. The multi‑file support lets you link external CSS and JS files via relative paths within the same project folder. Character encoding detection automatically handles UTF‑8, ISO‑8859‑1, and Shift‑JIS to prevent garbled text in multilingual pages. Touch‑optimized UI places common actions (run, save, import, clear console) within thumb reach on screens up to 6.9 inches.

Download Mobile App Now

Turn your phone into a portable web development environment. Write, test, and debug HTML, CSS, and JavaScript on the go—no laptop required. Get instant feedback with every edit.

Download HTML Viewer - HTML, JS, CSS Editor and Runner now and start coding anywhere.

Disclaimer: This app requires an active internet connection only for initial download and optional cloud‑file imports. All core editing and preview functionality works offline. In‑app purchases are available for additional themes and snippet packs. The app is rated for ages 10+ due to user‑generated code execution. Data usage is limited to file exports and optional cloud‑sync features; no personal data is collected by the developer. Compatible with Android 5.0 and above.