JavaScript Minifier
Minify JavaScript by stripping whitespace and comments
This minifier strips comments and unnecessary whitespace. For production builds with variable-name mangling and tree-shaking, use a parser-based tool like esbuild or Terser.
How it works
- 1Paste your JavaScript
Drop any JS — a single function, a whole file, or a snippet.
- 2Click minify
Comments, whitespace, and unnecessary line breaks are stripped instantly.
- 3Copy the result
Copy the minified output or see the size reduction.
About JavaScript Minifier
Free online JavaScript minifier. Strip comments, whitespace, and redundant semicolons from JS to reduce file size — typically 20-50% smaller. Handy for one-off pastes when you don't want to spin up a full build pipeline. Runs entirely in your browser. JavaScript Minifier on 712 Tools runs entirely inside your browser using modern JavaScript APIs — no server ever sees your data. That means instant results, complete privacy, and no upload limits.
Whether you need to minify javascript by stripping whitespace and comments for a debugging session, a quick sanity check, or a production incident, this tool is free to use as many times as you need. There are no watermarks, no sign-up, and no ads inside the tool itself.
Frequently asked questions
How much smaller does the JS get?
Typically 20-50%. Comment-heavy or well-formatted files shrink more; already-minified code shrinks less.
Does it mangle variable names?
No. Only whitespace and comments are removed — variable names are preserved. For name mangling use a real bundler like esbuild or Terser.
Will it break my code?
It preserves the code's tokens. That said, minification via regex has edge cases with regex literals and template strings — for production code, use a proper parser-based tool.
Is my code uploaded?
No. Minification runs entirely in your browser.
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