HTML/CSS/JS Playground
Write HTML, CSS, and JavaScript in a VS Code-powered editor with a live preview and console. Start from a template or blank — everything stays in your browser.
Loading Monaco editor…
By Vizo ToolLast updated August 20265 min read
HTML/CSS/JS Playground — CodePen-Style Editor in Your Browser
The HTML/CSS/JS Playground is a full CodePen-style editor powered by the Monaco engine (the same editor inside VS Code). Write HTML, CSS, and JavaScript in three syntax-highlighted panels and watch the result render live in an instant preview — with a real console that captures your logs, warnings, and errors.
Start from one of nine polished templates — a landing page, portfolio, dashboard, login page, pricing page, and more — or begin from a blank project. Your work autosaves to your browser, can be exported as a ZIP or individual files, and every single byte stays on your device: no uploads, no servers, no accounts.
- Monaco editor (VS Code engine)
- Live preview with console
- 9 starter templates
- Export project as ZIP
- 100% browser-based
Why Use HTML/CSS/JS Playground?
VS Code-Grade Editor
Monaco brings syntax highlighting, auto-completion, bracket matching, code folding, multiple cursors, find & replace, and a minimap to every panel.
Live Preview + Console
Your code renders instantly as you type, and the embedded console captures console.log, warn, error, and runtime errors exactly like DevTools.
Start From 9 Templates
Landing page, portfolio, dashboard, navbar, hero, login, pricing, card layout, or blank — build on a solid starting point instead of an empty file.
100% Private
Everything runs and is stored in your browser. Your code is never uploaded, so even confidential snippets stay yours.
Features
Three-Panel Monaco Editors
Separate HTML, CSS, and JavaScript panels with per-panel language intelligence.
Live Auto-Run
Debounced rendering updates the preview the moment you pause typing — with a manual Run button whenever you want it.
Built-In Console
Captures console.log / warn / error plus uncaught exceptions, with error highlighting.
Responsive Preview
Switch between desktop, tablet, and mobile viewport widths — or open a fullscreen preview.
Templates Library
Nine production-style starting points covering the most common front-end layouts.
Import & Export
Import individual HTML/CSS/JS files, export each file, or download the whole project as a ZIP.
Beautify & Minify
Format your code with one click, or minify it for size-sensitive deployments.
Auto Save & Restore
Your project is saved to local storage automatically and restored when you return.
How to Use the HTML/CSS/JS Playground
Build and preview a web project in three simple steps.
Choose a template or start blank
Pick one of the nine starter templates, or start from an empty project and write your own code.
Write your code
Edit the HTML, CSS, and JavaScript panels — the preview updates live and the console shows your logs and errors.
Export your project
Download your code as separate files or as a ZIP archive, or copy any panel to your clipboard.
Frequently Asked Questions
Got questions? We've got answers.
What is an HTML/CSS/JS playground?▼
It's an online editor where you write HTML, CSS, and JavaScript in separate panels and see the rendered result instantly — like a lightweight CodePen that runs entirely in your browser.
Is the playground free?▼
Yes, completely free with no sign-ups, no limits, and no watermarks.
Is my code uploaded anywhere?▼
No. All editing, previewing, and storage happens locally in your browser. Your code never leaves your device.
Which editor engine does it use?▼
It uses Monaco, the same editor engine that powers VS Code, with syntax highlighting, auto-completion, bracket matching, folding, and a minimap.
Does the preview update live?▼
Yes. The preview re-renders automatically a moment after you stop typing (debounced), and you can also hit Run manually.
Does it capture console.log output?▼
Yes. The console panel captures console.log, console.warn, console.error, and uncaught runtime errors, formatted like browser DevTools.
Can I start from a template?▼
There are nine templates: landing page, portfolio, dashboard, navbar, hero section, login page, pricing page, card layout, and a blank project.
Can I export my project?▼
Yes — download the HTML, CSS, and JavaScript as individual files, or export the entire project as a ZIP archive.
Can I import existing files?▼
Yes, you can import .html, .css, and .js files, and their contents are loaded into the matching editor panel.
Does it autosave my work?▼
Yes. Your project is saved to your browser's local storage as you type and restored automatically the next time you visit.
Can I preview at mobile sizes?▼
Yes — switch the preview between desktop, tablet, and mobile viewport widths, or open a fullscreen preview.
Is there a beautify option?▼
Yes, one-click Beautify formats the active panel, and Minify produces compact output for size-sensitive projects.
Does it work on mobile?▼
The tool is fully responsive and usable on tablets and phones, though the full three-panel layout is most comfortable on larger screens.
Can I use JavaScript libraries?▼
You can import libraries with <script src> tags or CDN links inside your HTML — anything the browser can fetch will load in the preview.
Why does my preview show a blank page?▼
Check the console panel for errors — a syntax error in JS or an unclosed tag in HTML usually explains a blank preview. Fix the highlighted line and re-run.
Related Tools
Try more free browser-based image tools.
Compress
Reduce image file size instantly
Resize
Perfect dimensions every time
Flip
Mirror & rotate instantly
Convert
PNG, JPEG, WEBP — instantly
Watermark
Protect photos with text or logo
Remove Background
AI background remover in your browser
Passport Photo
Passport-size photos for 25+ countries
Image to PDF
Merge JPG, PNG & HEIC into one PDF
PDF to Image
Convert PDF pages to JPG or PNG
Signature Resizer
Resize signatures to any size & KB limit
Social Media Resizer
Exact sizes for every social platform
JSON Formatter
Beautify, minify & validate JSON instantly
JSON Validator
Validate JSON with error line numbers
Base64 Encoder
Encode text or files to Base64
Base64 Decoder
Decode Base64 back to text or files
Password Generator
Strong random passwords with a strength meter
UUID Generator
Generate UUID v1, v4 & v7 in bulk
QR Code Generator
QR codes for URLs, WiFi, WhatsApp & more
Gradient Generator
Linear, radial & conic CSS gradients
Box Shadow Generator
Design CSS box shadows visually
JWT Decoder
Decode JWT tokens & check expiry
SQL Formatter
Beautify & minify SQL queries
SQL Playground
Run SQLite queries in your browser with sql.js
Meta Tag Generator
Create perfect SEO meta tags & SERP preview
Schema Generator
Generate JSON-LD structured data for 15+ types
Open Graph Generator
Design social share cards with live previews
Robots.txt Generator
Build a clean robots.txt in seconds
Sitemap Generator
Create XML sitemaps with image & video entries
UTM Builder
Build trackable campaign URLs with QR code
SERP Preview
See how your listing looks in Google search
Slug Generator
Create clean SEO-friendly URL slugs
Meta Tag Analyzer
Audit any page's meta tags & SEO score
Heading Checker
Check H1–H6 hierarchy & duplicate headings
Traffic Checker
Estimate website traffic from public SEO signals
SIP Calculator
Estimate the future value of your monthly SIP investments
Compound Interest
See how your principal grows with compound interest
EMI Calculator
Monthly EMI, interest & full amortization schedule
GST Calculator
Add or remove GST with CGST/SGST split
FD Calculator
Fixed deposit maturity value & interest earned
CAGR Calculator
Annualized growth rate of your investment
ROI Calculator
Return on investment & annualized ROI
Income Tax
Estimate Indian income tax — old & new regimes
Retirement Calculator
Project your retirement corpus & monthly income
Discount Calculator
Final price and savings after a discount
Profit Margin
Profit, margin & markup from cost and price
Stock Average
Average buy price across multiple purchases
Salary Calculator
Estimate take-home salary from CTC
Inflation Calculator
How inflation erodes purchasing power
Thumbnail Downloader
Download YouTube thumbnails in all available resolutions
Tags Extractor
Analyze video tags & get smart tag suggestions
Transcript Extractor
Get the transcript of any YouTube video with timestamps
Title Generator
Generate catchy, SEO-scored YouTube titles instantly
Description Generator
Write SEO-ready video descriptions with hashtags
Video Downloader
Save videos & audio — MP4, MP3, M4A with quality options