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JavaScript Minifier

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Code & Dev

JavaScript Minifier

Minify JavaScript code for production use.

Workspace

Run the tool here

Browser utility

Output

Run the workspace to see the response here.

How to use

Paste the script.
Minify and review the output size.
Run your tests against the minified build.

About this tool

Strip comments and unnecessary whitespace from JavaScript for a smaller production payload.

JavaScript Minifier is part of the TmpMailer Code & Dev set — free browser utilities that open instantly, need no account, and pair well with a temporary-email workflow when you just need a quick result.

Common use cases

Shrinking a small inline script.
Checking how much a bundle spends on whitespace.
Preparing a snippet for a size-limited field.

Common questions

Does it rename variables?

This is a whitespace/comment minifier, not a full optimiser. Use a bundler for mangling and tree-shaking.

Can automatic semicolon insertion cause bugs?

Yes. Removing line breaks can change behaviour when statements rely on ASI. Test thoroughly.

Should I minify vendor code?

Use the vendor's production build instead of re-minifying it yourself.

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