MMaster Tools
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CSS Beautifier

Expand minified or tangled CSS into clearly indented, human-readable style declarations.

How it works

  1. 1

    Paste your minified or messy CSS into the input area.

  2. 2

    Set your preferred indent size if the default does not match your project.

  3. 3

    The expanded output appears right away and stays in your browser.

Questions

How is this different from the CSS Formatter?

Both use the same indentation engine. The beautifier is aimed at making minified CSS readable again; the formatter is aimed at normalising hand-written CSS.

Will it add missing semicolons or brackets?

No. Beautification only changes whitespace. Syntax errors in your source will still be there after beautifying.

Does any data leave my device?

No. All processing happens in your browser — nothing is sent to any server.

JSON Formatter

JSON Formatter

Paste compact or messy JSON and get it back neatly indented with your chosen spacing.

JSON Minifier

JSON Minifier

Remove all whitespace and line breaks from a JSON document to shrink it as small as possible.

JSON Validator

JSON Validator

Check whether a JSON string is well-formed, and see the exact line and column of any syntax error.

JSON Beautifier

JSON Beautifier

Reformat JSON with sorted keys and readable indentation for easier reading and diffing.

JSON Tree Viewer

JSON Tree Viewer

Explore a JSON document as an interactive collapsible tree — expand and collapse any node.

XML Formatter

XML Formatter

Pretty-print XML with configurable indentation, preserving attributes, comments, and tag order.

XML Validator

XML Validator

Check XML for well-formedness and report every error with its line and column number.

YAML Formatter

YAML Formatter

Normalize and re-indent YAML, or convert it to JSON, with a configurable indent width.