Formatters
Beautify and format JSON, HTML, Markdown, and code.
JSON Formatter
Beautify, minify, and validate JSON with syntax highlighting and error detection.
Markdown Previewer
Write Markdown and see a live rendered HTML preview side by side.
HTML Beautifier
Format and indent messy HTML code into clean, readable structure.
About Formatters
Formatters on Toolzeni instantly clean up, beautify, and validate structured data and markup. Stop wrestling with minified or messy code — paste it in and get perfectly formatted output in one click.
The JSON Formatter beautifies, minifies, and validates JSON data with syntax highlighting and detailed error messages. The Markdown Previewer provides a side-by-side live editor where you write Markdown and see a rendered HTML preview — ideal for README files, blog posts, and documentation. The HTML Beautifier takes compressed or poorly indented HTML and reformats it into clean, consistently indented, readable markup.
Why Use Toolzeni?
All formatting happens in your browser — no code or data is sent to a server. The formatters support large inputs, work offline, and give you instant feedback as you type or paste content.