Will minifying break my code?

The minifiers are careful: strings, url() values, and content are left untouched, CSS selectors like `a :hover` keep their meaning, and calc() keeps its spaces. JavaScript uses the Terser minifier. Always test the result.

How much size does minifying save?

It varies by how much whitespace and commenting your original code has — the tool shows an exact before/after size comparison.

Is my code uploaded anywhere?

No, minification happens entirely in your browser.

Does it minify JavaScript as well as HTML and CSS?

Yes. JavaScript is minified with Terser (compression and variable renaming), and JSON and SVG are supported too.

Are HTML comments always removed?

They are removed by default, except IE conditional comments. Tick Keep comments to preserve them in HTML and CSS.

Does minifying CSS remove unused rules?

No, CSS minification only removes comments and unnecessary whitespace/formatting — it doesn't analyze your HTML to detect and remove unused selectors.

Can I reverse minification to get readable code back?

For CSS and JSON, tick Beautify instead to format them again. Minified HTML and JavaScript lose their original formatting, and JavaScript loses its variable names, so keep your source files.

What does the gzip figure mean?

It is the size the minified text would be after gzip compression, which is what most servers send over the network, so it is closer to the real download size.

Processed 100% locally in your browser

HTML & CSS Minifier

Minify HTML, CSS, JavaScript, JSON and SVG — with before/after size and gzip estimate, 100% local.

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Quick Answer

HTML & CSS Minifier lets you: Minify HTML, CSS, JavaScript, JSON and SVG — with before/after size and gzip estimate, 100% local. To start, pick HTML, CSS, JavaScript, JSON or SVG.

How to use this tool

1
Choose a language
Pick HTML, CSS, JavaScript, JSON or SVG.
2
Paste or drop your code
Type, paste or open a file — the result updates as you go.
3
Check the savings
The status bar shows the size before and after, and an estimate of the gzip size.
4
Copy or download
Copy the result or download it as a file.

Frequently Asked Questions

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Format SQL for 16 dialects with options for keyword case, indent and comma placement — comments preserved, 100% local.

JSON Formatter

A full-screen JSON editor: format, validate, repair, sort keys, and explore as a tree, table or JSONPath query — 100% local.

HTML & CSS Minifier

How to use this tool

Choose a language

Paste or drop your code

Check the savings

Copy or download

Frequently Asked Questions

Will minifying break my code?

How much size does minifying save?

Is my code uploaded anywhere?

Does it minify JavaScript as well as HTML and CSS?

Are HTML comments always removed?

Does minifying CSS remove unused rules?

Can I reverse minification to get readable code back?

What does the gzip figure mean?

Related Tools

SQL Formatter

JSON Formatter

HTML & CSS Minifier

How to use this tool

Choose a language

Paste or drop your code

Check the savings

Copy or download

Frequently Asked Questions

Will minifying break my code?

How much size does minifying save?

Is my code uploaded anywhere?

Does it minify JavaScript as well as HTML and CSS?

Are HTML comments always removed?

Does minifying CSS remove unused rules?

Can I reverse minification to get readable code back?

What does the gzip figure mean?

Related Tools

SQL Formatter

JSON Formatter