Does minifying change behavior?

It should not, but always test output because invalid code or edge cases can break.

Should production apps use this?

Production apps should usually use a build tool and source maps.

Does minification hide code securely?

No. It makes code harder to read but does not protect secrets.

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JavaScript Minifier

JavaScript Minifier for developers, APIs and content teams. Format, convert, validate or generate clean technical output.

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Try JavaScript Minifier Now

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Status

Free

Access

Browser workflow

Mode

Live workspace

Use JavaScript Minifier online

Enter your input, generate the result, copy the output, or download a processed file when this tool supports export.

LiveBrowser workflowDeveloper

All tools

Shared JavaScript Workspace

Minify JavaScript with controlled options

Prettier formats parser-validated JavaScript. Terser parses and minifies without executing the code. TypeScript and JSX are intentionally not accepted by this JavaScript-only workspace.

Browser worker

JavaScript inputMaximum 0.95 MB

Drop one .js, .mjs, or .cjs file here. Code stays in this browser and is never executed.

Press Ctrl+Enter or Command+Enter to minify.

Upload JavaScript

Formatter indentationSource typeFormatter semicolons

Minifier optionsComments

Enable compressionMangle local identifiers

Open JavaScript Formatter

Output

Minified JavaScript

No JavaScript output yet

Paste valid JavaScript, then choose Format or Minify. Parser errors will show a source location when available.

Paste JavaScript or upload a .js, .mjs, or .cjs file to begin.

Privacy
JavaScript files and text are parsed in a browser worker. Input and output are not sent to TanzaiTools servers.

No execution
Submitted code is parsed and printed, never run with eval, Function, a script element, or an application sandbox.

Language scope
Modern JavaScript scripts and ES modules are supported by the selected parser. TypeScript, JSX, runtime correctness, and target-browser compatibility are not validated.

Recent local JavaScript outputs (0)

Successful outputs up to 146 KB are saved only in this browser.

Loading JavaScript workspace...

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Overview

About JavaScript Minifier

JavaScript Minifier reduces JavaScript text by removing unnecessary whitespace and formatting for smaller snippets. It is useful for demos, quick embeds, testing and simple optimization workflows. For production apps, use a proper build pipeline with bundling, tree shaking and source maps.

Features