Developer Toolbox

Fast, privacy-focused tools that run entirely in your browser. No data is ever sent to a server.

100% Client-Side - No Data Collection

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Test regular expressions with live matching and highlighting. Supports JavaScript regex syntax.

Test regex-based search-and-replace rules with capture groups, flags, and detailed match output.

Powerful text utility to remove specific characters, trim whitespace, remove blank lines, and normalize spacing locally.

Generate lorem ipsum text by words, sentences, or paragraphs. Includes classic and developer-focused placeholder modes.

Write Markdown with live preview and export clean HTML instantly. Supports GitHub Flavored Markdown in your browser.

Compare two text files to find differences. Fast, local text comparison and diff viewer.

Analyze any text: character/word/sentence/paragraph counts, reading time, Flesch readability, byte length, and top words — all locally.