SASS Compiler
Compile indented SASS into browser-ready CSS with variable resolution, nesting flattening, and mixin expansion — all client-side.
Last updated: May 25, 2026
SASS compilation runs locally in your browser. Your pasted SASS and generated CSS are not uploaded.
Need a specific QR type?
Find this tool useful? Support the project to keep it free!
Buy me a coffeeWhat is SASS Compiler?
A SASS Compiler converts SASS source code into standard CSS. SASS is the original indentation-based syntax for Sass: blocks are defined by whitespace rather than curly braces, statements omit semicolons, and mixin definitions and calls use the `=name`/`+name` shorthand instead of `@mixin`/`@include`. Like SCSS, it supports `$variables`, nested selectors, parent references (`&`), and at-rules such as `@media`.
This compiler runs entirely in your browser. It first normalises the indented SASS source into SCSS-style code (adding braces and semicolons, expanding `=`/`+` shorthand into `@mixin`/`@include`) and then compiles the SCSS into CSS — substituting variable references, flattening nested selectors into descendant rules, and inlining mixin bodies wherever they are included. `@media`, `@supports`, `@container`, and `@keyframes` blocks are preserved with their bodies flattened.
It is meant for quick compilations of straightforward stylesheets — copying a SASS snippet from a tutorial into a static page, prototyping CSS from a SASS partial, or sanity-checking how indentation will collapse. Sass features that require evaluation (control flow with `@if`/`@for`/`@each`, custom `@function` definitions, `@use`/`@forward` module loading, and built-in helpers like `lighten()` or `darken()`) are not run; for those use the official Dart Sass toolchain.
How to Use SASS Compiler
Paste indented SASS into the input panel, or click Load Sample.
The compiled CSS appears instantly on the right as you type.
Inspect how nested rules, variables, and mixins collapse into CSS.
Copy the CSS or download it as a .css file.
Rework any unsupported helpers (control flow, colour functions) manually.
Common Use Cases
- Compile a SASS component snippet into plain CSS for a static page.
- Test how indented SASS variables and mixins resolve into CSS.
- Produce a quick CSS file from a SASS partial without installing Sass locally.
- Convert documentation examples from indented SASS into browser-ready CSS.
- Sanity-check whitespace and indentation before committing.
Example Input and Output
Compile an indented SASS card with a mixin into plain CSS.
$primary: #0f766e
=pill
padding: 4px 12px
border-radius: 999px
.tag
+pill
color: $primary.tag {
padding: 4px 12px;
border-radius: 999px;
color: #0f766e;
}How This Tool Works
The compiler first runs the indented SASS through a normaliser that adds braces and semicolons and rewrites =mixin/+include shorthand into @mixin/@include. The resulting SCSS source is then parsed into a node tree, with $variables and @mixin definitions registered in symbol tables. A flattening pass walks the tree to produce CSS rules — substituting variable references, expanding nested selectors and & parent references, and inlining mixin bodies wherever they are included. @media, @supports, @container, and @keyframes blocks are emitted as wrappers with their contents flattened.
Technical Stack
Compiler scope
This compiler covers the most common authoring features — variables, nesting, mixins, and at-rules. For Sass control flow, custom functions, and built-in colour helpers, use the official Dart Sass toolchain.
Indentation rules
The compiler auto-detects the indent unit (2 or 4 spaces) from the first nested line. Mixing tabs and spaces, or changing indent size mid-file, can produce unexpected results.
Privacy
All compilation happens locally in your browser. No SASS or CSS is transmitted to any server.