Code & Development / Minifier / Beautifier

HTML CSS JS Minifier Online Free & Beautifier

Reduce file size or beautify compressed code — directly in your browser, no data sent. Ideal for optimizing ad creatives, debugging minified HTML tags, cleaning CSS copied from Figma or comparing size before/after minification.

Input
Result
100 % local — no data sent · no code execution
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Before (chars)
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After (chars)
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Compression
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Lines
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Elements
Adtech use case: minified HTML ad tag received from a studio or ad server? Beautify it to inspect trackers, third-party scripts and URLs. Minify / beautify guide · Chain with the Redirect Tracker to verify the complete chain.

How it works

  1. Choose the language (HTML, CSS, JS) and mode: minify, beautify or analyze.
  2. Import a file (.html, .css, .js, .tsx, .vue, .txt…), paste or type your source code — it is processed as plain text (no eval).
  3. Stats always compare the minified size to estimate weight savings.

Frequently asked questions

Is minification safe for production?
This is a helper tool: verify the result, especially for complex JS (template literals, regex). Always test minified code before deployment.
Beautify vs minify?
Minify removes spaces and comments to reduce size. Beautify re-indents to read and debug compressed code.
Does my data leave my browser?
No. Everything happens locally via native JavaScript string manipulation.