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Minify JS
Safely shrink JavaScript by stripping comments and whitespace - never joins lines.
js-minifier.tool
0 chars
Result will appear hereNothing you paste here is ever sent to a server - processing happens locally in your browser.
What is a minify js?
This tool shrinks JavaScript by stripping comments and unnecessary whitespace - safely. Unlike aggressive minifiers that join lines together, this one deliberately never merges two lines, because JavaScript's Automatic Semicolon Insertion (ASI) means joining lines without a full parser can silently change what your code does (a bare `return` followed by a newline behaves completely differently from `return` followed directly by a value on the same line).
How to use this tool
- 1Paste your JavaScript, or upload a .js file.
- 2Click Run - comments are stripped and blank/indented whitespace is removed.
- 3The size reduction percentage is shown next to the output.
- 4Copy the result or download it as a .js file.
Common use cases
Quickly shrinking a script for a size-conscious embed or snippet
Cleaning comments and formatting out of code before sharing it
Reducing a script's size when a full build pipeline (webpack, esbuild) isn't available
Preparing JavaScript for a context with tight character limits
Good to know
Frequently asked questions
Why doesn't this achieve the tiny output size that Terser or UglifyJS produce?
Those tools use a full JavaScript parser to safely rewrite code - renaming variables, joining statements, removing dead code. Building that from scratch isn't realistic for a browser-based utility, and a naive line-joining approach can silently break code due to Automatic Semicolon Insertion. This tool trades maximum compression for a guarantee that your code's behavior never changes.
Are comments inside strings affected?
No - the tool tracks string and template literals character by character, so something like a URL containing // inside a string is never mistaken for a comment.
For production deployments, what should I use instead?
A bundler-integrated minifier like Terser (used by webpack) or esbuild, which parses your code into an AST and can safely make far more aggressive size reductions than a text-based tool like this one.
Is my code sent anywhere?
No - everything runs locally in your browser.
quick_facts.json
{
"runs_in_browser": true,
"data_sent_to_server": false,
"signup_required": false,
"price": "free",
"category": "Converters"
}