Developer Tools

Small, fast tools for everyday development work. No sign-up, and your text is processed in your browser, never uploaded.

Regex TesterTest JavaScript regular expressions live: match highlighting, capture groups, replace and a pattern library.Markdown to HTML ConverterConvert Markdown to clean, sanitised HTML with live preview, GFM tables and one-click copy or download.YAML to JSON ConverterConvert YAML to JSON instantly with line-and-column errors, multi-document support and .yml files.JSON to YAML ConverterConvert JSON to clean block-style YAML with exact error positions and safe quoting. Runs in your browser.