Real-time Code Minifier & Preview
See minification results instantly as you edit. This live tool compresses your code on-the-fly, showing original and minified versions side-by-side with real-time size savings.
0 characters
0 characters
Real-Time Processing
Code is automatically minified as you type with a 150ms debounce delay for smooth performance.
Multiple Formats
Support for JavaScript, CSS, HTML, and JSON with format-specific optimizations.
Easy Export
Copy to clipboard or download the minified file with a single click.
How the Real-Time Minifier Works
This tool minifies code instantly as you type - no button to click, no waiting. Paste or write JavaScript, CSS, HTML, or JSON, and see the minified output update within milliseconds. The debounced processing ensures smooth performance even with large files.
Minification removes unnecessary characters: whitespace, comments, line breaks, and optional semicolons. Variable names stay intact (this isn't obfuscation), but the file shrinks significantly - often 30-60% smaller than the original.
What gets removed during minification:
- Comments (// single-line and /* multi-line */)
- Extra whitespace and indentation
- Line breaks and carriage returns
- Optional semicolons in JavaScript
- HTML comments and unnecessary attributes
- CSS comments and whitespace around selectors
Live statistics show original size, minified size, and percentage reduction. Copy the minified output with one click or download as a file ready for production deployment.
When You'd Actually Use This
Quick production builds
Need to deploy a hotfix but don't want to run the full build pipeline? Paste your JavaScript, grab the minified version, deploy immediately. Faster than waiting for webpack or rollup for simple changes.
Inlining critical CSS
Above-the-fold CSS should be inlined in HTML for performance. Minify it first to reduce the inline payload. A 5KB stylesheet becomes 3KB - meaningful for initial page load.
Creating bookmarklets
Bookmarklets are JavaScript URLs with a character limit. Minify your code to fit more functionality. Real-time feedback helps you iterate until it fits under the limit.
Testing minification impact
Wondering how much minification saves? Paste code, see the reduction percentage instantly. Helps decide if setting up a build process is worth it for your project size.
Preparing code for embedding
Embedding a script in a README, documentation, or code snippet? Minified code takes less space. For small utilities, the entire minified code fits in a single code block.
Learning how minification works
Type code and watch what gets removed. See how comments disappear, whitespace compresses, and optional characters drop. Educational for understanding build optimization.
What to Know Before Using
This is minification, not obfuscation.Variable names remain readable. For code protection, you need obfuscation (renaming variables to a, b, c) which this tool doesn't do. Minification is for performance, not security.
Source maps aren't generated.Production builds typically create source maps for debugging minified code. This tool doesn't generate source maps. Keep your original code for debugging purposes.
Very large files may lag.Real-time processing with 10,000+ lines can cause typing lag. The debounced update helps, but for huge files, consider a build tool with incremental compilation.
Minification doesn't optimize logic.Inefficient algorithms stay inefficient after minification. A O(n²) loop doesn't become O(n). Minification only removes characters, it doesn't improve code quality.
Pro tip: For production, use a proper build pipeline (webpack, esbuild, terser) with tree-shaking and code splitting. This tool is great for quick tasks but lacks advanced optimizations.
Common Questions
Is minified code still valid?
Yes, minification preserves functionality. The minified code executes identically to the original. If minification breaks your code, it's a bug in the minifier - report it with a reproduction case.
Can I un-minify code?
Use a beautifier/prettifier to restore readability. It won't recover comments or original formatting, but it makes minified code human-readable again for debugging purposes.
Does minification improve performance?
Indirectly - smaller files download faster, especially on slow connections. Parsing time is marginally reduced. The main benefit is reduced bandwidth, not faster execution.
Should I minify JSON?
For API responses, yes - removes whitespace, reduces bandwidth. For config files humans edit, no - keep them readable. Minify JSON that's shipped to browsers or stored long-term.
What's the difference between minify and compress?
Minification removes characters. Compression (gzip, brotli) encodes the file more efficiently. Use both: minify first, then serve compressed. They're complementary, not alternatives.
Can I minify TypeScript directly?
This tool minifies JavaScript. For TypeScript, compile to JavaScript first (tsc), then minify the output. TypeScript syntax isn't valid JavaScript and would cause minification errors.
How much size reduction should I expect?
Typical reduction: 30-60% depending on code style. Well-formatted code with comments shrinks more. Already-compact code shrinks less. The stats panel shows exact reduction for your code.
Other Free Tools
HTML Minifier
Free HTML Minifier & Compressor
CSS Minifier
CSS Minifier & Compressor Online
JavaScript Minifier
JavaScript Minifier & Compressor Tool
JSON Minifier
JSON Minifier & Compressor Online
XML Minifier
XML Minifier & Compressor Tool
ASCII to Hex Converter
ASCII to Hex Converter: Text to Hexadecimal Translator
Barcode Generator
Free Barcode Generator
Binary to Text Converter
Binary to Text Converter
Free Printable Calendar Maker
Create & Print Your Custom Calendar
Pie Chart Maker
Free Pie Chart Maker Online