Developer toolbox

Online Text Tools for Developers

Compare, transform, preview, and analyze text with fast browser-based developer utilities. Each tool is focused on one common development task and is available without an account.

Text Tools

Choose a tool

6 tools
String Escape & Unescape ToolEscape and unescape JSON, JavaScript, HTML, and URL text for development workflows.Open tool →List Compare ToolCompare two lists to find intersections and items unique to either side.Open tool →Markdown PreviewerEdit Markdown and preview the rendered result safely in your browser.Open tool →HTML PreviewerPreview HTML in a restricted browser sandbox without uploading your source.Open tool →Text Compare & Diff CheckerCompare two blocks of text by character, word, or line and inspect their differences.Open tool →Text UtilitiesCount, sort, reverse, and transform text with practical browser-based utilities.Open tool →

Normalize text only when the rule matches the task

Text utilities cover escaping, comparison, preview, list operations, and statistics. Results can change when case, whitespace, duplicate lines, line endings, or punctuation are treated differently, so make those choices explicit.

Review the edge cases

Use a short sample first, compare the output with the source, and preserve an original copy when the text represents configuration, code, or a user document.

  • Use a diff mode that matches the change you are reviewing.
  • Treat Markdown and HTML previews as rendering aids, not publication or security scanners.
  • Check whether sorting and duplicate handling preserve the data contract.

Browse all developer tools or read the developer tool guides for practical examples.