Free developer tools
Format, Validate, Convert!
A growing suite of fast, private developer tools. Everything runs client-side, so your data never leaves your device, and when you are done, publish the result to a live HTTPS link in one click.
JSON tools
JSON Beautifier
Free online JSON beautifier and pretty printer. Paste messy JSON and get clean, indented, readable output instantly, 100% in your browser, nothing uploaded.
JSON Minifier
Free online JSON minifier. Strip whitespace and line breaks to shrink JSON for faster APIs and smaller payloads. Runs fully in your browser, never uploaded.
JSON Validator
Free online JSON validator and syntax checker. Find the exact line and reason your JSON is invalid, then fix it fast, all in your browser, never uploaded.
JSON to XML Converter
Free online JSON to XML converter. Turn any JSON object or array into clean, well-formed XML instantly, processed in your browser, your data is never uploaded.
XML to JSON Converter
Free online XML to JSON converter. Parse any XML document into clean, structured JSON in one click, done entirely in your browser, your data is never uploaded.
JSON to CSV Converter
Free online JSON to CSV converter. Flatten a JSON array into a clean, spreadsheet-ready CSV for Excel or Google Sheets, in your browser, never uploaded.
HTML tools
HTML Formatter
Free online HTML formatter and beautifier. Paste messy or minified HTML and get clean, properly indented markup instantly, in your browser, never uploaded.
HTML Viewer
Free online HTML viewer. Paste HTML and see it rendered live, with the formatted source alongside. Runs in your browser in a safe sandbox, nothing is uploaded.
HTML Validator
Free online HTML checker. Spot unclosed tags, broken nesting, and missing attributes with fast structural checks that run in your browser, never uploaded.
Test HTML
Free online HTML, CSS & JavaScript playground with a live preview. Write code in separate panes, see it run instantly, then publish it to a live page.
Converters
HTML to Markdown
Free online HTML to Markdown converter. Paste HTML or drop a file and get clean, GitHub-flavored Markdown instantly. Runs in your browser, nothing is uploaded.
Markdown to HTML
Free online Markdown to HTML converter with live preview. Turn GitHub-flavored Markdown into clean, safe HTML that runs in your browser, never uploaded.