Less Minifier
FormattersMinify Less source without compiling — strips comments and collapses whitespace while preserving variables, mixins, and nesting. Shows compression ratio. Browser-based.
About Less Minifier
The Less Minifier performs source-level minification on Less stylesheets — stripping all single-line (`//`) and block (`/* */`) comments, collapsing all whitespace sequences to a single space, and removing spaces around syntax characters (`{}`, `:`, `;`, `,`, `()`, `>`, `~`, `+`). The output retains full Less syntax: `@variables`, parameterised mixins, nesting, `@import`, and all Less-specific constructs — making it ideal for reducing Less source files before distributing as part of a theme or design system. Compression ratio and exact byte savings are shown after each run.
Features
- ✓Source-level minification — preserves Less syntax without compiling to CSS
- ✓Strips single-line comments (// comment) and block comments (/* comment */)
- ✓Collapses all consecutive whitespace to a single space
- ✓Removes spaces around syntax characters: {, }, :, ;, ,, (, ), >, ~, +
- ✓Preserves @variables, .mixins(), nesting, @import, and all Less-specific syntax
- ✓Instantaneous — pure string transformation with no Web Worker needed
- ✓Displays compression ratio and exact byte savings after minification
- ✓Download minified output as a .less file with one click
- ✓Language picker — instantly switch to SCSS, CSS, JavaScript, or other minifiers
- ✓One-click clipboard copy of minified output
- ✓Mobile-responsive layout with a dedicated Minify button
- ✓100% client-side — your stylesheets never leave the browser
Common Use Cases
- Reducing Less source file size before distributing as part of an npm package
- Stripping development comments from Less component libraries before publishing
- Compressing Bootstrap Less source files for embedding in documentation
- Reducing Less patch size when committing style changes to long-lived branches
- Quickly measuring how much whitespace and comments exist in a Less file
Frequently Asked Questions
QDoes this compile Less to CSS?
No — this tool minifies Less source while preserving Less syntax. The output is still Less. To compile Less to CSS, use the Less Compiler, then run the CSS through the CSS Minifier.
QAre Less variables and mixins preserved?
Yes — the minifier only removes comments and extra whitespace. All Less @variables, parameterised mixins, nesting, and @import statements are preserved.
QIs my Less sent to a server?
No. All minification is pure string processing in your browser. Nothing is transmitted to any server.