Compile SCSS/Sass code to standard CSS with variable resolution, nesting expansion, and mixin processing.
Paste SCSS in, get plain CSS out. The tool reads your source, substitutes every $variable with its value, flattens nested rules into descendant selectors, and expands @include'd mixins so the result is one flat stylesheet a browser can load directly. Everything runs in the page, so your source is never uploaded. The first thing users trip on: this is a single-file tool. Projects organized as partials loaded with @use or @import will not resolve those file references, so paste one self-contained file at a time, or inline everything yourself.
A concrete input and expected output from the current implementation.
Input
$base: 8px;
.card {
padding: $base * 2;
border-radius: $base * 0.5;
h2 {
font-size: 20px;
}
&.featured {
border-color: #ff9500;
}
} Expected output
.card {
padding: 16px;
border-radius: 4px;
}
.card h2 {
font-size: 20px;
}
.card.featured {
border-color: #ff9500;
} The variable resolves at both use sites (8px * 2 = 16px, 8px * 0.5 = 4px), the nested h2 rule flattens to the descendant selector .card h2, and & takes the value of the parent selector, so &.featured becomes .card.featured.
The compiler works from the entire source at once, so it knows every selector, variable, and mixin before any CSS is written; a parse error in one part of the file produces no output rather than a partial stylesheet. Sass scoping rules hold: a $variable or mixin must be declared before it is referenced, and a variable declared inside a rule is visible only in that rule and its descendants.
Each rule is compiled from its outermost selector inward. Plain nesting joins selectors with a space, producing a descendant selector such as .card h2. The ampersand stands for the full parent selector list and joins without a space, so &.featured, &::before, and & + & all compile to selectors the parent could not express on its own. Rules with no nesting pass through unchanged.
That depends on the tool; the reliable test is to paste a few lines of indented syntax and see whether it compiles. SCSS (curly braces, semicolons) and indented Sass (whitespace instead of braces) are two syntaxes for the same language, and compilers differ in which modes they enable. If indented syntax errors out, rewrite the block with braces and semicolons; the compiled result is identical.
For a one-off or a small static site, yes: compile each SCSS file and save the output as the stylesheet the page loads. For an ongoing project, no: a build step also handles partial imports, source maps, and recompilation on every save. A single-pane compiler is a check or a one-time conversion, not a replacement for a preprocessor.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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