JavaScript Minifier
JavaScript Minifier
Minify JavaScript by removing comments and compacting whitespace.
Result size
0chars
Live update on input changes.
File input
Choose a file
Click, drop, or paste from clipboard.
Options
0 option(s)
No additional options required.
More actions
Input: manual
Input: manualInputsText/FileManual input • Auto-updateWaiting
Your input is processed locally in your browser whenever possible. We do not store your data.
Flow
- Parse JavaScript source into an internal syntax tree.
- Remove unnecessary whitespace/comments where safe.
- Emit compact JavaScript while preserving behavior.
Example
Worked example: compact a function block
- 1 Input contains comments and spaced formatting.
- 2 Minifier strips comments and collapses whitespace.
- 3 Output keeps logic but uses fewer characters.
Minified output is ready for payload-size checks.
How
- Paste JavaScript source code into the input panel.
- Run minify to compress output.
- Copy compact code and test in your runtime.
Cases
- Reduce inline script size for embeds and demos.
- Compare raw vs minified output during build debugging.
- Generate compact snippets for documentation examples.
Avoid
- Assuming minified output is easier to debug than source code.
- Skipping syntax validation before minification.
- Deploying minified output without runtime smoke tests.
FAQ
Does javascript minifier send my input to a server?
No. JavaScript Minifier handles the input in your browser whenever possible, so routine conversions, previews, and copy actions stay on your device instead of being sent to Calctrove servers.
Does this execute my JavaScript?
No. The tool only transforms code text in-browser and never executes it.
Will minification guarantee smaller gzip output?
Usually yes, but exact transfer size still depends on gzip/brotli and surrounding bundle context.
Switch
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