Dev Toolkit

Format, minify, and validate JSON with syntax highlighting. Paste messy JSON and get clean, readable output instantly.

Convert text to Base64 and back. Supports UTF-8 encoding for international characters.

Generate random UUID v4 identifiers. Bulk generate up to 100 UUIDs at once with one-click copy.

Decode and inspect JSON Web Tokens. View header, payload, claims, and check expiration status.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text input using the Web Crypto API.

Encode and decode URL components. Handles special characters, query parameters, and full URLs.

Test regular expressions with real-time matching. Supports flags (g, i, m, s) and shows all matches with capture groups.

Convert colors between HEX, RGB, and HSL formats with a live preview swatch.

Generate placeholder text by words, sentences, or paragraphs. Copy-ready for mockups and prototypes.

Compare two text inputs side-by-side and highlight the differences. Identify additions, deletions, and changes.

Parse cron expressions into human-readable descriptions. View next execution times, field breakdowns, and use common presets.

Live markdown preview with GitHub Flavored Markdown support. Split-pane editor with tables, checkboxes, code blocks, and more.

Live preview for Mermaid diagrams. Flowcharts, sequence diagrams, class diagrams, Gantt charts, pie charts, and more with SVG export.

Convert between Unix timestamps and human-readable dates. Shows current timestamp, relative time, and multiple output formats.

Minify CSS to reduce file size or beautify it for readability. Shows character count and savings percentage.

Encode special characters to HTML entities and decode them back. Supports named entities (&) and numeric entities (&).

Convert numbers between binary, octal, decimal, and hexadecimal. Supports large numbers with bitwise visualization.

Convert text between camelCase, PascalCase, snake_case, kebab-case, SCREAMING_SNAKE, Title Case, and more. Click to copy any result.

Generate TypeScript interfaces or type aliases from JSON. Handles nested objects, arrays, and optional fields with configurable output.