JS Minifier

Compress JavaScript Quickly Without a Bundler

Every byte matters when shipping JavaScript to users. Comments, whitespace, and extra formatting add file size. Bundlers like Webpack and esbuild handle minification automatically, but sometimes you need quick, lightweight minification: removing comments from scripts you're embedding inline, reducing code snippets for documentation, or compressing scripts before shipping.

This JS Minifier strips comments and unnecessary whitespace, compressing JavaScript to the smallest readable format. It's not a full AST-level optimizer like Terser, but it's perfect for quick minification without heavyweight tooling.

What Gets Removed

Comments: Single-line (//) and multi-line (/* */) comments are stripped completely. License comments (often preserved by tools like Terser) are removed here, so if you need copyright headers, add them back post-minification or use a different tool.

Whitespace: Extra spaces, tabs, and newlines collapse. Line breaks only appear where JavaScript syntax requires them (after statements ending with semicolons).

Formatting: Code compacts to minimal space while remaining executable. This is different from code optimization—it doesn't rename variables or remove dead code. The resulting script is functionally identical.

Compression Metrics

The tool shows you exactly how much you saved: bytes reduced and percentage compression. For a 5KB script with lots of comments and indentation, you might see 30-40% reduction.

When to Use This vs. a Bundler

Use This Tool When:

• You need quick minification without build setup
• You're compressing small utility scripts
• You're reducing code snippets for documentation or inline embedding
• You want to see immediate minification results
• You're working with simple scripts that don't need advanced optimization

Use a Bundler When:

• You're shipping production code that needs AST-level optimization
• You need variable renaming, dead code elimination, and advanced transforms
• You want scope analysis and aggressive optimizations
• You're bundling multiple files with dependencies

Real-World Use Cases

Inline Scripts: Minify small JavaScript snippets you're embedding in HTML documents or templates.

Third-Party Script Distribution: If you're publishing JS for other developers to use, minify it before release to reduce payload size.

Userscripts & Bookmarklets: Compress JavaScript you're publishing on Gist or other platforms where smaller size helps with sharing.

Documentation Code Examples: Reduce code snippets in docs to fit better in display areas.

Quick Testing: Rapidly check how much minification would save before committing to a full build process.

Limitations to Know

This tool uses regex-based text transformation, not AST parsing. It won't:

• Rename variables to shorter names
• Eliminate unused code
• Optimize control flow
• Inline small functions

For production code needing these optimizations, use Terser, esbuild, or similar tools as part of your build pipeline.

Copy & Embed Immediately

Once minified, copy with one click. Paste directly into your templates, inline scripts, or distribution packages.

100% Browser-Based

Minification happens locally in your browser. Your code never touches a server, so you can minify proprietary or sensitive scripts safely.