JavaScript Minifier
Minify JavaScript with Terser in a local Worker, with byte statistics and error positions — never executed, never uploaded.
Open tool — JavaScript MinifierJavaScript Minifier vs JavaScript Formatter — What's the Difference?
The short answer: JavaScript Minifier / JavaScript Formatter: Inputs and controls / Visible result and export. Minify JavaScript with Terser in a local Worker, with byte statistics and error positions — never executed, never uploaded. Format minified JavaScript source code in a local Worker without executing it. Paste source up to 256 KiB UTF-8. Nothing is executed. Choose 1–8 spaces or tabs. The selected setting applies when you press Format. JavaScript formatting uses a parser/printer for modules, directives, regular expressions and templates without executing source. Parser acceptance does not prove runtime compatibility. Choose by the task and review the current limits before exporting.
Comparison of JavaScript Minifier and JavaScript Formatter
| JavaScript Minifier | JavaScript Formatter | |
|---|---|---|
| Purpose | Minify JavaScript with Terser in a local Worker, with byte statistics and error positions — never executed, never uploaded. | Format minified JavaScript source code in a local Worker without executing it. Paste source up to 256 KiB UTF-8. Nothing is executed. Choose 1–8 spaces or tabs. The selected setting applies when you press Format. JavaScript formatting uses a parser/printer for modules, directives, regular expressions and templates without executing source. Parser acceptance does not prove runtime compatibility. |
| Input | JavaScript Minifier: Paste UTF-8 source up to 256 KiB. The indent control is disabled for Minify. | JavaScript Formatter: JavaScript · Paste source up to 256 KiB UTF-8. Nothing is executed. |
| Output | JavaScript Minifier: Use Copy result for the clipboard or Download to save toolars.min.js — Copy result is the fast path when the output is headed straight into a script tag. Reset clears the panes for the next script. JavaScript removes ordinary comments without compression or name mangling and never executes the source. | JavaScript Formatter: Yes. Both export the current visible UTF-8 result. Changing the source or indentation invalidates the previous result; run again before exporting. Input: 256 KiB UTF-8. Output: 512 KiB. Worker startup and execution each have a five-second budget. Cancel or an edit terminates the Worker and clears stale output. |
| Typical use | JavaScript Minifier: Minifying a script or bundle snippet for production delivery | JavaScript Formatter: Reading JavaScript source: unpacking minified code to review or debug it |
JavaScript Minifier vs JavaScript Formatter
What it does
Depends on the taskMinify JavaScript with Terser in a local Worker, with byte statistics and error positions — never executed, never uploaded. Format minified JavaScript source code in a local Worker without executing it. Paste source up to 256 KiB UTF-8. Nothing is executed. Choose 1–8 spaces or tabs. The selected setting applies when you press Format. JavaScript formatting uses a parser/printer for modules, directives, regular expressions and templates without executing source. Parser acceptance does not prove runtime compatibility.
Input
JavaScript Minifier wins hereJavaScript Minifier: Paste UTF-8 source up to 256 KiB. The indent control is disabled for Minify. JavaScript Formatter: JavaScript · Paste source up to 256 KiB UTF-8. Nothing is executed.
Output
Depends on the taskJavaScript Minifier: Use Copy result for the clipboard or Download to save toolars.min.js — Copy result is the fast path when the output is headed straight into a script tag. Reset clears the panes for the next script. JavaScript removes ordinary comments without compression or name mangling and never executes the source. JavaScript Formatter: Yes. Both export the current visible UTF-8 result. Changing the source or indentation invalidates the previous result; run again before exporting. Input: 256 KiB UTF-8. Output: 512 KiB. Worker startup and execution each have a five-second budget. Cancel or an edit terminates the Worker and clears stale output.
Best for
Depends on the taskJavaScript Minifier: Minifying a script or bundle snippet for production delivery JavaScript Formatter: Reading JavaScript source: unpacking minified code to review or debug it
The tools
JavaScript Formatter
Format minified JavaScript source code in a local Worker without executing it. Paste source up to 256 KiB UTF-8. Nothing is executed. Choose 1–8 spaces or tabs. The selected setting applies when you press Format. JavaScript formatting uses a parser/printer for modules, directives, regular expressions and templates without executing source. Parser acceptance does not prove runtime compatibility.
Open tool — JavaScript FormatterFrequently asked questions
What's the difference between JavaScript Minifier and JavaScript Formatter?
Inputs and controls. JavaScript Minifier: JavaScript removes ordinary comments without compression or name mangling and never executes the source. JavaScript Formatter: Choose 1–8 spaces or tabs. The selected setting applies when you press Format.
Can I use JavaScript Minifier and JavaScript Formatter together?
Visible result and export. JavaScript Minifier: Use Copy result for the clipboard or Download to save toolars.min.js — Copy result is the fast path when the output is headed straight into a script tag. Reset clears the panes for the next script. JavaScript removes ordinary comments without compression or name mangling and never executes the source. JavaScript Formatter: Yes. Both export the current visible UTF-8 result. Changing the source or indentation invalidates the previous result; run again before exporting. Input: 256 KiB UTF-8. Output: 512 KiB. Worker startup and execution each have a five-second budget. Cancel or an edit terminates the Worker and clears stale output. Use the first tool for this task; use the second for its separate result.