All Free Online Developer Tools & Utilities

Convert text between uppercase, lowercase, title case, and more

Compare two texts and highlight differences

Find and replace text with optional ECMAScript regex (including $1/$2 capture-group backreferences), case-insensitive, whole-word, and multiline modes. Live match count, recipe presets, in-place chain apply.

Generate placeholder text for designs and mockups

Preview and edit Markdown with live rendering

Visual GFM Markdown table builder with paste-from-spreadsheet import, per-column alignment, and pipe-escape safety

Extract a table of contents from any Markdown document with GitHub-, GitLab-, or Pandoc-style heading anchors. Configurable depth, duplicate-slug handling, ordered or unordered list, base-level normalization.

Estimate reading and speaking time for any text at an adjustable words-per-minute. Counts words and characters instantly in your browser.

Remove duplicate lines from any list, keeping the first occurrence. Case-insensitive and trim options, plus optional alphabetical sort.

Remove line breaks from text instantly — replace with spaces, strip entirely, or keep paragraphs. Handles Windows, Mac, and Unix line endings.

Sort lines alphabetically, numerically, by length, in reverse, or randomly shuffle. Optional case-insensitive, deduplication, whitespace trimming. Crypto-strength Fisher-Yates shuffle.

Turn any title into a clean, lowercase, diacritic-free, RFC 3986-safe URL slug with separator, case, and stop-word controls

Count words, characters, and reading time for any text