ZeroKit
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  • Paste & share
  • Word & character counter
  • Case converter
  • Text diff / compare
  • Lorem ipsum generator
  • Find & replace
  • Text to slug / URL encode
  • Remove duplicate lines
  • JSON formatter / validator
  • JSON to CSV / XML / YAML
  • HTML beautifier / minifier
  • CSS beautifier / minifier
  • JavaScript beautifier / minifier
  • SQL formatter
  • Regex tester
  • Cron expression builder
  • Markdown editor
  • Code screenshot
  • Base64 encode / decode
  • URL encode / decode
  • HTML entity encode / decode
  • JWT decode / inspect
  • Hash generator
  • UUID / ULID generator
  • Unix timestamp converter
  • Number base converter
  • Image compressor
  • Image format converter
  • Image resizer & cropper
  • SVG optimiser
  • Favicon generator
  • Base64 ↔ image
  • Colour picker
  • Palette generator
  • Contrast checker (WCAG)
  • CSS gradient generator
  • PDF merge
  • PDF split
  • PDF compress
  • HTML / Markdown to PDF
  • QR code generator & reader
  • Password generator
  • URL shortener
  • IP / network lookup
  • Speed test
  • Emoji picker
  • OG meta tag previewer
  • AI code explainer
  • AI regex builder
  • AI SQL writer
  • AI JSON schema generator
  • AI colour palette

Developer / code

10 tools in this category

JSON formatter / validator

Format, validate, and minify JSON with error hints.

JSON to CSV / XML / YAML

Convert JSON to CSV, XML, or YAML and back.

HTML beautifier / minifier

Format or minify HTML.

CSS beautifier / minifier

Format or minify CSS.

JavaScript beautifier / minifier

Format or minify JavaScript.

SQL formatter

Pretty-print SQL for PostgreSQL, MySQL, or SQLite.

Regex tester

Test regular expressions with live highlighting.

Cron expression builder

Build cron strings and preview next run times.

Markdown editor

Edit Markdown with live preview and export.

Code screenshot

Create beautiful code images for sharing.

ZeroKit

52 free online tools for developers, designers, and everyone. Client-side by default — your data never leaves your browser.

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