MMaster Tools
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HTML Beautifier

Turn compressed or hand-written HTML into neatly indented, readable markup in one step.

How it works

  1. 1

    Paste your compressed or hand-written HTML into the input area.

  2. 2

    Pick an indent size — 2 or 4 spaces are the most common choices.

  3. 3

    The readable output appears instantly. Copy or download it, all on your device.

Questions

How is this different from the HTML Formatter?

Both tools apply the same indentation pass. The beautifier is aimed at making minified code readable; the formatter is aimed at standardising code that is already written by hand.

Will it repair broken tags?

No. The tool only adds whitespace and indentation — it does not parse or correct invalid HTML.

Does any code leave my device?

No. Beautification runs entirely in your browser. Your code is never sent anywhere.

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.