JavaScript Minifier

A JavaScript minifier removes characters that aren't needed to run your code — comments, whitespace, indentation and unnecessary line breaks — to produce a smaller file that downloads and parses faster. Toollyz JavaScript Minifier also validates, beautifies, compares and analyzes your code.

The tool tokenizes your code with a full ES6+ lexer, then re-emits it with the shortest safe spacing between tokens, dropping comments and collapsing whitespace. It preserves line breaks only where automatic semicolon insertion (ASI) requires them, so the output behaves exactly like your original.

No. This is safe minification — it never renames variables or functions and never reorders statements, and it keeps the line breaks that ASI depends on. That makes it impossible for the minifier to change your program's behavior, unlike aggressive obfuscators.

Yes. Click Beautify to pretty-print minified or messy code with clean indentation (2 spaces, 4 spaces or tabs). You can toggle between minify and beautify freely, with full undo/redo.

Yes. The tokenizer fully understands modern JavaScript — arrow functions, classes, async/await, destructuring, template literals, optional chaining (?.), nullish coalescing (??), BigInt, numeric separators and private class fields all minify correctly.

Yes. Enable “Remove console statements” (included in the Aggressive and Production presets) to strip standalone console.log/info/warn/… calls, and “Remove debugger” to drop debugger statements before shipping.

Minification shrinks file size while keeping the code readable-ish and behaviorally identical. Obfuscation deliberately makes code hard to understand, often by mangling names and restructuring logic. This tool does safe minification, not obfuscation — for name mangling, pair it with a bundler like esbuild or Terser.

Yes. Drag a single file onto the editor to load it, or drop several files into the Bulk tab to minify them all at once with your current settings, with per-file savings and one-click download.

No. All tokenizing, minification, validation and analysis happen entirely in your browser — your JavaScript is never uploaded to any server. Saved sessions live only in your device's local storage.

Yes. The editor, settings, analytics, validation, comparison and bulk tools are fully responsive and touch-friendly, so you can optimize JavaScript on any device.

Completely free with no signup and no limits. Minification, beautifying, validation, analytics, bundle analysis, comparison, bulk processing and exports are all available to everyone, privately in your browser.