HTML Preview

Paste HTML code and see it rendered live in a safe sandboxed preview. Free, instant, 100% private.

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About HTML Preview

Preview your HTML code in real-time. See how your markup renders with a live, sandboxed preview window. Perfect for prototyping, learning HTML, and debugging layouts. All in your browser.

Live Rendering

See HTML rendered in real-time as you type. Instant feedback for rapid prototyping and learning.

Safe Sandbox

Preview runs in a sandboxed iframe, isolated from the main page. Experiment with any HTML and JavaScript safely.

CSS Reset Option

Optionally apply a CSS reset before your HTML. See how it renders without browser default styles interfering.

Blazing Fast

All rendering happens in your browser. No server round-trips. Private and instant with zero latency.

📋 Common Use Cases

Development Workflow

Speed up common dev tasks — encoding, formatting, validation — without writing throwaway scripts.

Debugging & Testing

Isolate and verify code, data, or encoding issues during development and debugging.

Learning & Reference

Experiment with encoding, hashing, and transformation concepts interactively.

Production Optimization

Minify, validate, and optimize code and assets before deployment.

🪜 How to Use This Tool

  1. Enter your input
    Paste code, JSON, encoded strings, or other input. File uploads also supported where relevant.
  2. Configure tool options
    Set parameters like indentation, encoding type, hash algorithm, or validation rules.
  3. Process and view results
    Click to encode, decode, format, minify, or validate. Results appear with appropriate highlighting.
  4. Copy and use
    Copy output to clipboard for immediate use in your project, config, or debugging session.

📚 Related Guides

Frequently Asked Questions

Are these dev tools free?▼
Yes. All dev tools are completely free. No signup, no account.
Is my data sent to a server?▼
No. Base64 encoding, URL encoding, JWT decoding, hash generation, and regex testing all happen in your browser. Your tokens and secrets stay on your device.
Can I decode JWTs safely?▼
Yes. JWT decoding happens entirely in your browser. The token never leaves your device. Only the header and payload are decoded — signatures are not verified server-side.