Can it break a value that contains a brace or a semicolon?

It should not. Comments, quoted strings and url() values, including the unquoted form of url(), which may legally hold braces and semicolons, are read as single opaque atoms before any layout decision is made. So a semicolon inside content: "a;b" or a brace inside a data: URI is invisible to the block splitter, and whitespace is only ever collapsed outside those atoms.

CSS Formatter

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CSS in

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Formatted

Runs entirely in your browser, nothing is uploaded.

How it works

CSS Formatter and Minifier : Safe With url() and Strings

Tidy a messy stylesheet or minify it for production. Strings, url() values and comments are treated as untouchable, so nothing inside them can be reformatted by accident.

What this does

Any at-rule nests by brace depth, so @supports inside @media indents to the right level
One selector per line, split on top-level commas only, never on a comma inside :is() or :not()
Minify keeps the spaces CSS needs: inside calc(), and before the colon in a descendant selector
Unbalanced braces stop the run and say how many blocks are left open or stray

FAQ

No. Every comment is dropped, so a licence banner has to be put back afterwards.

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