Which minifiers are used?

Terser for JavaScript and csso for CSS — the same engines behind most build pipelines. HTML gets a built-in structural pass: comments, whitespace, and redundant attributes are removed without touching inline scripts or styles.

Is my code sent anywhere?

No. Minification runs entirely in the browser on this page.

What does aggressive HTML mode change?

It also removes optional closing tags like and . The output stays valid HTML, but diff it before shipping.

Why did my JavaScript fail to minify?

Terser parses the code first, so a syntax error stops the run and the message is shown. Fix the reported spot and try again.

Code Minifier

Minify JavaScript, CSS, and HTML with byte-level savings.

Runs in browser

Use via MCP

Source

JavaScript sourcejavascript

function greet(name) {
  const greeting = "Hello, " + name + "!";
  console.log(greeting);
  return greeting;
}
 
greet("world");

Mangle namesShorten local variable and function names.

CompressApply Terser's compression passes.

Minified

Nothing yet

Paste some code on the left.

Type or paste code to minify.

Use from your agent

Streamable HTTP at https://benchline.fabwaseem.com/mcp. No key. The tool name is minify_code.

mcp.jsonjson

2 "mcpServers": {

3 "benchline": {

4 "url": "https://benchline.fabwaseem.com/mcp"

5 }

6 }

tools/calljson

2 "jsonrpc": "2.0",

3 "id": 1,

4 "method": "tools/call",

5 "params": {

6 "name": "minify_code",

7 "arguments": {

8 "language": "js",

9 "code": "example",

10 "jsMangle": true,

11 "jsCompress": true,

12 "cssLevel": 2,

13 "htmlAggressive": false

14 }

15 }

16}

Related tools

How it works

Free code minifier. Shrink JavaScript with Terser and CSS with csso, plus a structural HTML pass that strips comments, collapses whitespace, and cleans redundant attributes. Toggle mangling, compression, and aggressive HTML options, then compare before/after byte counts and the savings percentage.

01
Pick a language
Switch between the JavaScript, CSS, and HTML tabs.
02
Tune the options
Turn mangling and compression on or off, pick the CSS optimization level, or enable aggressive HTML mode.
03
Copy the output
Read the before/after byte counts and the savings percentage, then copy or download the minified code.