Format YAML and XML, test regular expressions, change text case, count words and draw Mermaid diagrams. Everyday text and data chores for writing code and documentation.
Regex Tester - Test and debug your regular expressions in real-time with syntax highlighting and match results.
List Utilities - Perform common operations on lists, such as sorting, finding unique items, and counting distinct entries.
Array Generator - Convert a list of items into an array for your favorite programming language.
Markdown Previewer - Write Markdown text and see a live, rendered HTML preview side-by-side.
Code Diff Viewer - Compare two blocks of text or code to see a visual representation of the differences.
Mock Data Generator - Generate realistic fake data — names, emails, UUIDs, dates, and more — as JSON or CSV, entirely in your browser.
Mermaid Diagram Editor - Write Mermaid syntax and see a live flowchart, sequence, or class diagram preview, then export it as SVG or PNG.
Sequence Diagram Generator - Turn a text script of who-calls-who into a live UML sequence diagram — actors, arrows, and responses — exportable as SVG or PNG.
Case Converter - Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, Title Case and Sentence case, one line at a time or all at once.
Lorem Ipsum Generator - Generate lorem ipsum placeholder text as paragraphs, sentences or words, optionally starting with "Lorem ipsum" and wrapped in HTML paragraph tags.
YAML Formatter / Validator - Format, validate and minify YAML in your browser, with line and column error messages, adjustable indentation, key sorting and multi-document support.
XML Formatter / Validator - Pretty-print, validate and minify XML in your browser, with line and column error messages, adjustable indentation and attribute sorting.
Word Counter - Count words, characters, sentences and paragraphs as you type, with reading and speaking time and a top-keywords list. Handles emoji and unspaced scripts; nothing leaves your browser.
HTML to Markdown - Convert HTML to clean Markdown, or Markdown to HTML with a safe preview: headings, lists, links, images, code blocks and GFM tables, entirely in your browser.