Free online JavaScript minifier and compressor. Reduce JS file size by removing whitespace, comments, and simplifying syntax. Minify scripts for faster page loads and improved web performance scores. Supports ES6+ syntax and source maps. Essential for frontend developers. 100% browser-based.
100% browser-based — your data never leaves your device
Minify JavaScript code by removing whitespace, comments, and simplifying syntax.
Copy your JavaScript code and paste it into the input textarea above.
Press Minify to compress your code by removing whitespace, comments, and simplifying syntax.
Copy the minified JavaScript for production use. Check the size savings displayed below.
Drop a file here or click to browse
Ctrl+Enter to minify
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JavaScript Minifier is a free online text tool that minify javascript code by removing whitespace, comments, and simplifying syntax. It works entirely in your browser — no downloads, no installations, and no server uploads required. content writers, developers, technical writers use JavaScript Minifier when they need a fast, privacy-respecting way to process text data without installing additional software. It supports capabilities such as whitespace removal, comment stripping, syntax simplification. Additional features include size comparison. Common use cases include compressing javascript files for production websites and applications, reducing script load times to improve page performance metrics, preparing minified bundles for cdn deployment. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes JavaScript Minifier ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
JavaScript Minifier is a free online text tool that helps you minify javascript code by removing whitespace, comments, and simplifying syntax. Key capabilities include whitespace removal, comment stripping, syntax simplification. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to compressing javascript files for production websites and applications.
Copy your JavaScript code and paste it into the input textarea above.
Press Minify to compress your code by removing whitespace, comments, and simplifying syntax.
Copy the minified JavaScript for production use. Check the size savings displayed below.
| Category | Details |
|---|---|
| Input Limits | Maximum input length: Browser memory bound |
| Encoding support: UTF-8, UTF-16, ASCII, ISO-8859-1, Windows-1252 | |
| Supported Formats | Plain text, UTF-8, ASCII, Unicode, Percent-encoding (RFC 3986) |
| Browser Engine |
|
All operations run entirely in your browser using built-in Text APIs. No server uploads, no data storage, and no third-party requests.
JavaScript Minifier is ideal when you need to compressing javascript files for production websites and applications without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For for advanced text manipulation within an IDE, consider using VS Code. For for batch text processing on servers, sed/awk (command-line) may be a better fit. JavaScript Minifier fills the gap between heavyweight desktop tools and insecure online services that require uploading your data.
No. JavaScript Minifier processes everything entirely in your browser using JavaScript. Nothing you type, paste, or upload is ever transmitted to any server. Your data never leaves your device.
Whitespace, comments, and optionally shortens local variable names. The code logic is preserved identically.
Proper minification preserves all functionality. Strings, regex expressions, and template literals are handled correctly.
Removes spaces, tabs, and newlines while preserving string literals and regex patterns.
Removes single-line and multi-line comments to reduce file size.
Optionally shortens variable names and simplifies boolean expressions.
Displays original vs minified size with byte savings and percentage.
JavaScript Minifier is useful in a variety of scenarios across different workflows:
Compressing JavaScript files for production websites and applications
Reducing script load times to improve page performance metrics
Preparing minified bundles for CDN deployment
When minifying for production, generate source maps so you can debug the original code in browser dev tools while serving the minified version to users.
Use this tool during development, but automate minification in your build pipeline with tools like Terser or esbuild for consistent results.
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Lorem Ipsum Generator
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URL Encode/Decode
Encode or decode URLs and query strings with proper percent-encoding.
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