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Formatiq / Formatters & Beautifiers / JavaScript Minifier

JavaScript Minifier

Client-sideNo sign-upFree

Strip comments and collapse whitespace in JavaScript, safely, without touching your logic.

How this tool works

1

Paste your JavaScript

A snippet or full file - strings and template literals are handled safely.

2

Character-by-character scan runs

Comments are removed while string and template literal contents are left completely alone.

3

Check the size comparison

Before/after byte counts show how much the whitespace and comment removal actually saved.

4

Copy the result

Grab the trimmed script - safe whitespace minification only, no renaming or logic changes.

Quick facts

Category
Formatters & Beautifiers
Best for
Trimming script size without a full build pipeline
Safe whitespace & comment minification only - no variable renaming, dead-code elimination, or AST-based compression like Terser. Output stays byte-for-byte equivalent to your source logic.
Input
154 bytes before
Minified output
function add(a, b) { return a + b; } const greeting = "// this is not a comment"; console.log(add(2, 3));
105 bytes after - 31.8% smaller
In-content slot

About this tool

Paste JavaScript and get comments and extra whitespace removed while every string, template literal, and character inside them is left completely untouched - the minifier walks the source character by character rather than using blind regex substitution, so a "//" or "/* */" sequence sitting inside a string literal is never mistaken for a real comment. Before/after byte counts and a percentage reduction show the size savings. This intentionally does only safe whitespace-and-comment minification: it does not rename variables, eliminate dead code, or perform any AST-based transformation the way a build-time tool like Terser or esbuild would, so nothing here can change your code’s behavior. For maximum compression in a production build pipeline, a real bundler-integrated minifier is still the better choice - this is meant for quick one-off shrinking, not a build step replacement.

Why use this tool

String-literal aware

Walks the source character by character so a "//" inside a string is never mistaken for a comment.

Behavior-preserving

Only removes comments and whitespace - no variable renaming or dead-code elimination that could change behavior.

Honest about its scope

Clearly labeled as safe whitespace minification, not a Terser-level replacement - no surprises.

Instant, no bundler required

Useful for a quick size check without setting up esbuild or Terser for one file.

Frequently asked questions

No - this only strips comments and collapses whitespace, so the byte savings are smaller than what a full AST-based minifier achieves through variable renaming, dead-code elimination, and expression shortening. It’s meant for a quick size check or one-off cleanup, not as a replacement for the minifier in your actual build pipeline.

No - the minifier tracks whether it’s currently inside a quoted string or template literal as it scans the source, so sequences like "//" or "/*" that appear inside a string (e.g. a URL) are copied through unchanged rather than being treated as the start of a comment.

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