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Comments, indentation, and line breaks in JavaScript are essential for developers but add nothing for the browser executing the code — minifying strips all of it out.
This tool removes comments and collapses whitespace in JavaScript, producing a smaller equivalent script.
How it works
Paste your JavaScript. The tool removes block comments (/* ... */) and line comments (// ...), then collapses all remaining whitespace and removes unnecessary spaces around punctuation like braces, parentheses, and semicolons.
- Enter javaScript input.
- Click Calculate to see your results.
Examples
Minifying a small function
A formatted function with comments and line breaks shrinks down to a single dense line with no comments or unnecessary whitespace.
Who should use it
- Quickly shrinking a small utility script.
- Learning what JavaScript minification actually removes.
Industry applications
- Web development and performance optimization
- DevOps and build pipelines
Advantages
- Quick and simple for small, straightforward scripts.
- No account or installation needed — just paste and go.
Limitations
- Regex-based approach can misinterpret "//" inside a regular expression literal as a comment.
Common mistakes to avoid
- Relying on this for production minification of complex codebases — a dedicated tool like Terser or esbuild handles edge cases (like regex literals) far more reliably.
- Minifying code that's still under active development, making it much harder to read and debug.
Best practices
- Use this for quick, simple scripts, and switch to a proper build-tool minifier (Terser, esbuild, UglifyJS) for production bundles of non-trivial size.
Tips
- For anything beyond a small script, use a proper build tool (Terser, esbuild) in your deployment pipeline — it handles renaming, dead-code elimination, and edge cases like regex literals far more safely than simple whitespace stripping.