HTML, CSS, and JavaScript Minifier
Shrink HTML, CSS, or JavaScript by stripping comments, whitespace, and unnecessary characters. Smaller files mean faster page loads, and this minifier processes your code without sending it anywhere.
How to use the Code Minifier
- Paste your HTML, CSS, or JavaScript into the input area.
- Select the matching language mode so the right rules apply.
- Press minify and compare input and output sizes.
- Copy the minified code into your build or production file.
When the Code Minifier is useful
- Reducing file size for pages served without a bundler or CDN pipeline.
- Inlining small scripts or styles where every byte counts.
- Preparing code snippets for embedding in size-limited systems.
- Comparing before and after sizes when testing optimization wins.
How the Code Minifier works
For CSS and JavaScript, minification removes comments, line breaks, and redundant whitespace while preserving syntax; string contents and quoted values are left intact. HTML minification trims whitespace between tags and drops comments without touching text content. The tool reports how much space you saved, which is useful for documenting performance work. Everything runs client-side, an important detail when the code involved is proprietary or under NDA.
Limits to keep in mind
Aggressive minification of edge-case code, such as JavaScript relying on automatic semicolon insertion, can occasionally alter behavior; always test the minified output.
Frequently asked questions
Does minification change how my code works?
Correctly written code behaves identically; only comments and whitespace are removed.
Should I minify code that goes through a bundler anyway?
If your pipeline already minifies, doing it twice adds little; this tool fits projects without a build step.
Is my source code uploaded?
No. Minification happens entirely in your browser, so private code stays private.
Last reviewed: October 2026.