JavaScript Minifier
Minify JavaScript in your browser by removing comments and extra whitespace. Free JS minifier, source stays local.
Processed locally in your browser.
How to use this javascript minifier
Paste JavaScript and click Minify. Line comments, block comments, and unnecessary whitespace are stripped. String literals are left intact.
This is not Terser or esbuild: it does not mangle names or parse TypeScript. Use it for quick size checks and simple scripts.
Example
function hi() { return 1; } minifies toward function hi(){return 1;}
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Frequently asked questions
Does this support TypeScript?
Not as a parser. TS-specific syntax may survive or break. Compile to JS first for best results.
Is this as small as production bundlers?
No. Bundlers also mangle identifiers and fold constants. This minifier is intentionally small and local.
Is JavaScript uploaded?
Processed locally in your browser. We do not upload the text to compute a result.
Last reviewed 2026-08-19. Results stay on your device unless you copy them elsewhere.