Developer
JS Minifier
- Browser-based
- No signup
Dedicated JavaScript compression for smaller scripts. Paste code, copy the minified output, and compare input versus output size. A conservative pass that does not rename variables or mangle identifiers.
100% Client-Side
Your data never leaves your computer.
How to use this tool
Paste JavaScript into the input editor. Review the minified output, use Format to beautify, then copy the compact script. Run your tests after minifying—especially if the source relied on automatic semicolon insertion at line breaks.
Worked example
Example: a 120-byte function with comments and indentation may shrink to ~70 bytes while keeping the same logic: `function greet(name){return 'Hi '+name}`.
How it works
Opens the JavaScript Formatter in minify mode. Strips block and line comments and collapses whitespace where safe, producing a smaller script without renaming identifiers.
Limitations
Lightweight whitespace minifier—not Terser or a bundler. Test after minifying. Use JavaScript Formatter and Minifier for format and minify in one panel.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Frequently asked questions
How is this different from JavaScript Formatter and Minifier?
JS Minifier is compression-only with byte savings shown. The combined formatter also pretty-prints code and lets you toggle modes on the same input.
Is this the same as Terser or UglifyJS?
No. This is a lightweight whitespace and comment remover. It does not rename variables, dead-code eliminate, or parse ES modules.
Should I test after minifying?
Yes. Always run your tests—especially if the source relied on line breaks for automatic semicolon insertion.
Related tools
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- Formatters — compare developer tools and read FAQs
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- JS Beautifier — Beautify JavaScript with readable indentation—formatting only, no minify.
- JavaScript Formatter and Minifier — Pretty-print or minify JavaScript in one panel—switch modes on the same input.
- HTML Minifier — Minify HTML — dedicated compression page; same engine as HTML Formatter.
- CSS Minifier — Compress CSS by removing comments and whitespace—see bytes saved.
- HTML Formatter and Minifier — Format or minify HTML markup in your browser.
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