Build and deconstruct URLs with quick previews.

Check WCAG contrast ratios for accessible design.

Test your keyboard by seeing pressed keys light up.

See mouse position, button state, and recent click/wheel events.

Convert between CSV, TSV, JSON, YAML, and XML with two-way sync.

Convert Unix timestamps to human-readable dates.

Convert times between common time zones.

Encode and decode Base64.

Decode and build JWTs.

Encode and decode URL components.

Format JSON, JavaScript, TypeScript, HTML, CSS, XML, YAML, SQL, or Markdown.

Edit Markdown and see a live-rendered preview.

Generate color palettes from a base color.

Create SHA hashes from any text input.

Generate strong passwords with configurable character sets.

Generate v4 UUIDs instantly in the browser.

Pick a color and copy its HEX or RGB value.

Test regex patterns with instant match results.