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How To Use
Quick Guide

Get started in seconds

CodePreview.live lets you write, paste, or upload HTML, CSS, and JavaScript — then instantly preview the result in a new tab. No account needed.

01
Paste your code

Click anywhere inside the editor and paste your HTML, CSS, or JavaScript. The editor accepts full HTML documents or code snippets — it handles both automatically.

Ctrl + V / Cmd + V or use the Paste button
02
Or upload your files

Click the Upload button to select one or more files from your computer. Supported formats: .html, .css, .js, and .txt. Multiple files are automatically combined into a single preview.

.html .css .js .txt
03
Run the preview

Press Run Preview to open your code in a new browser tab. The preview renders exactly as a real browser would — including scripts, styles, and animations. Make sure popups are allowed for this site.

Click "Run Preview" — a new tab opens instantly
04
Edit and iterate

Edit directly in the editor — Tab inserts 4 spaces, and the status bar updates character and line counts in real time. Hit Run Preview again any time to re-render your changes.

Tab key inserts 4 spaces automatically
05
Clear and start fresh

Use the Clear button to wipe the editor and begin a new project. You will be asked to confirm so no work is lost accidentally.

Clear button → confirm dialog → fresh editor
Features
What's inside

Everything you need to preview code

A focused, distraction-free tool built for developers who want instant visual feedback without the setup overhead.

Live Code Preview

Instantly render your HTML, CSS, and JavaScript in a real browser tab. No build step, no CLI — just hit Run.

Built-in Code Editor

A clean monospace editor with line numbers, character count, tab indentation, and real-time status — all in the browser.

File Upload Support

Upload HTML, CSS, JS, and text files. Multiple files are automatically merged so your full project renders correctly.

Fast Rendering

The preview opens in a new tab with zero delay. No server-side processing — your code runs directly in the browser engine.

Responsive Testing

Resize the preview window freely to test your layouts across breakpoints — desktop, tablet, and mobile all in one tab.

Developer-First Interface

No ads, no distractions, no account required. A clean dark interface designed around the developer's workflow.

Blog
Developer Reads

Insights for frontend developers

Practical guides, tips, and resources to help you build, test, and ship code faster.

Guide
How to Preview HTML Code Online Without Installing Anything

You have an HTML snippet and you want to see how it looks — fast. This guide covers the quickest way to go from code to rendered output in seconds using only your browser.

Jun 2026 4 min read
Tools
Best Free Code Editors and Playgrounds in 2026

A curated comparison of the top browser-based editors and local editors for developers — what they do well, what they miss, and when to reach for each one.

May 2026 6 min read
Beginner
HTML, CSS, and JavaScript: Understanding How They Work Together

Before writing your first line of frontend code, it helps to understand what each language does and why you need all three. This explainer breaks it down simply.

Apr 2026 5 min read
Tips
Frontend Development Tips That Save Hours of Debugging

Practical habits and workflows that experienced frontend developers use to catch layout bugs faster, write cleaner CSS, and spend less time with DevTools open.

Mar 2026 7 min read
Dev Workflow
How Developers Test Code Faster: A Workflow Breakdown

From browser devtools to online sandboxes to local servers — a look at how professional developers move quickly from idea to working prototype without slowing down.

Feb 2026 5 min read
FAQ
Common Questions

Frequently asked questions

Quick answers to the things developers ask most often about CodePreview.live.

Yes, completely free. No account, no subscription, no paywall. You open the page and start coding. There are no hidden limits on the number of previews you can run.

No account is needed. Just visit the site and start writing or pasting code immediately. Your code stays in your browser and is not sent to any server.

You can upload .html, .htm, .css, .js, and .txt files. Multiple files can be selected at once — CSS and JS are automatically injected into the HTML document before the preview renders.

The preview opens in a new browser tab. If nothing happens, your browser is likely blocking popups from this site. Look for the popup-blocked icon in your address bar and allow popups for CodePreview.live, then click Run Preview again.

No. Your code exists only in your browser while the page is open. Nothing is transmitted to a server, logged, or persisted. Refreshing the page clears the editor.

Yes. Include any CDN links directly in your HTML code using standard <script> and <link> tags and they will load normally in the preview tab, as long as you have an internet connection.

The editor and interface are fully responsive and work on mobile browsers. Typing large amounts of code on mobile is less comfortable than on a keyboard, but quick pastes and file uploads work well on phones and tablets.

CodePreview.live was built by Zdev — a solo developer focused on creating clean, fast, no-friction tools for the developer community.

About
The tool

Built for developers who move fast

CodePreview.live started from a simple frustration: previewing a snippet of HTML should not require opening an IDE, creating a file, and starting a server.

Zero setup. Instant results.

CodePreview.live is a browser-based HTML, CSS, and JavaScript preview tool designed to eliminate the friction between writing code and seeing it run. Paste a snippet, upload a file, click Run — that is the entire workflow.

The tool handles full HTML documents and bare code fragments equally well, wrapping snippets in a complete document automatically so the output always renders correctly. CSS and JavaScript files uploaded alongside HTML are injected in the right places without any manual wiring.

Everything runs in your browser. No sign-in, no telemetry, no upload to a remote server. The code you write stays on your machine until the moment you choose to run it — at which point the browser opens it directly, the same way it would open any local HTML file.

0
Sign-ups required
<1s
Time to first preview
100%
Browser-side processing
Speed over ceremony

Every interaction is optimized to be as immediate as possible. No loading screens, no modals, no onboarding flows.

Privacy by default

Your code never leaves your machine. No analytics on what you write, no server logs of your work.

Designed for focus

No ads, no popups, no upsells. Just the editor and a Run button. The interface gets out of the way so you can think about code.

Contact
Get in touch

We would love to hear from you

Have a bug to report, a feature idea, or just want to say something? Reach out — responses usually come within 48 hours.

Email

For bug reports, feedback, and general inquiries. Best for detailed messages.

Feedback

Feature requests and suggestions to improve the tool for developers like you.

Send a message

Fill out the form and we will get back to you as soon as possible.

Privacy Policy
Legal

Privacy Policy

Last updated: June 2026

Overview

CodePreview.live ("we", "the tool", "the service") is committed to protecting your privacy. This policy explains what information is collected, how it is used, and your rights as a user.

Information We Do Not Collect

CodePreview.live is a client-side tool. The code you write, paste, or upload in the editor is processed entirely within your browser. It is never transmitted to our servers, stored in any database, or shared with third parties.

  • We do not collect the code you write or upload.
  • We do not require or collect any account credentials.
  • We do not track individual users or build profiles.
  • We do not sell any data to third parties.

Cookies and Local Storage

CodePreview.live does not use tracking cookies. No data is persisted to your browser's local storage or session storage. Each page load starts with a clean state.

Analytics

If basic analytics are collected (such as page view counts), they are aggregated and anonymised. No personally identifiable information is included in any analytics data.

Third-Party Services

CodePreview.live does not embed third-party advertising, social tracking pixels, or affiliate tracking scripts. If external CDN resources are loaded as part of your own preview code, those requests are initiated by your browser directly to those services and are governed by their respective privacy policies.

Children's Privacy

CodePreview.live is a general developer tool and is not directed at children under the age of 13. We do not knowingly collect information from children.

Changes to This Policy

We may update this Privacy Policy from time to time. Changes will be reflected on this page with an updated date. Your continued use of the service after changes constitutes acceptance of the updated policy.

Contact

If you have questions about this privacy policy, you can reach us through the Contact page.

Terms & Conditions
Legal

Terms & Conditions

Last updated: June 2026

Acceptance of Terms

By accessing and using CodePreview.live, you agree to be bound by these Terms and Conditions. If you do not agree to these terms, please do not use the service.

Use of the Service

CodePreview.live is provided as a free developer utility. You may use the service for:

  • Testing and previewing HTML, CSS, and JavaScript code.
  • Learning web development concepts.
  • Prototyping and debugging frontend code snippets.
  • Any other lawful development purpose.

Prohibited Use

You agree not to use the service to:

  • Execute malicious scripts or code designed to cause harm.
  • Attempt to exploit, overload, or interfere with the service.
  • Distribute illegal content through previews.
  • Violate any applicable laws or third-party rights.

Intellectual Property

The code you write in the editor remains your own. CodePreview.live does not claim ownership over any code you create or preview using the service. The CodePreview.live interface, design, and source code are the property of Zdev and may not be copied or reproduced without permission.

Disclaimer of Warranties

CodePreview.live is provided "as is" and "as available" without warranties of any kind, either express or implied. We do not guarantee that the service will be error-free, uninterrupted, or suitable for any particular purpose.

Limitation of Liability

To the fullest extent permitted by applicable law, Zdev shall not be liable for any indirect, incidental, special, consequential, or punitive damages arising from your use of or inability to use the service.

Changes to Terms

We reserve the right to modify these terms at any time. Continued use of the service after changes constitutes acceptance of the updated terms.

Contact

For questions about these terms, please use the Contact page.