Strip comments and whitespace from JS. Identifiers are preserved.
Was this tool helpful?
96% · 153 people found this tool helpful
Strip comments, blank lines and unnecessary whitespace from JavaScript to ship smaller bundles. The tool is a safe minifier — it does not rename identifiers, mangle scope, or rewrite expressions — which means it never breaks code, even when the input depends on function names at runtime. Use it as a quick win on inline scripts, third-party snippets, or any JS that isn't already going through a bundler.
Drop your JavaScript into the editor — it accepts files of any size that your browser can handle.
Set indent width, comment handling, and other minify preferences from the toolbar.
Click the minify button to process the JavaScript entirely in your browser — nothing is uploaded.
Copy the minify-ready JavaScript to your clipboard or save it as a file for your build pipeline.
Ugly, minified, or inconsistently indented code is a productivity tax. JavaScript Minifier normalizes formatting so diffs are meaningful, code reviews stay focused on logic, and beginners aren't intimidated by wall-of-text output. It's the kind of tool you invoke reflexively — copy, paste, tidy, back to work. Toolzer's design philosophy is simple: privacy-first (no tracking, no accounts), performance-first (the page is interactive in under a second on a 3G connection), and honesty-first (no fake ratings, no dark patterns, no upsells). JavaScript Minifier follows the same rules as every other utility on the site. You can bookmark this page, share the URL with a colleague, or pin it to your browser's toolbar — the experience will be identical every visit, and it will keep working even if you're on airplane Wi-Fi. Real people use this tool for real work — freelancers cleaning up client deliverables, sysadmins triaging tickets, students finishing assignments — and it is tuned for those workflows, not for demo videos.
Renaming requires a full scope analysis and breaks any code that uses Function.name, eval, or reflective lookups. We prioritise safety here; for maximum compression use esbuild, terser or swc in a build pipeline.
Yes — async/await, optional chaining, classes, JSX-free TSX-free ES modules all pass through. Strings (including template literals) are preserved untouched.
No. Dead-code elimination needs an AST-level tool. This minifier only touches characters that don't affect program meaning.
No. Everything runs in your browser.
No. Every utility on Toolzer is free, anonymous, and works in any modern browser without registration.
Yes. Whenever the tool can produce an answer entirely in the browser, the data never leaves your device.
Yes. The interface is fully responsive and works on iOS Safari, Android Chrome, and every modern mobile browser.
Yes. Every Toolzer page has a clean permanent URL you can bookmark or share.
JSON is the lingua franca of modern APIs, configs and logs — but it is unreadable when minified onto one line.
Base64 encodes binary data as ASCII text so it survives email, JSON, HTTP headers and other text-only chann…
JSON Web Tokens encode user identity and claims into a compact, signed string used by most modern APIs.
Hash functions turn any input into a fixed-length fingerprint.
The User Agent Parser is a fast, single-purpose tool that focuses on doing one job well.
The HTTP Status Codes Reference is a fast, single-purpose tool that focuses on doing one job well.