Dev & Code
Formatters, codecs, hashes, timestamps, diffs, and transformers that never leave your browser.
JSON / YAML / TOML Converter
Bidirectional conversion with validation, formatting, and tree view.
Regex Tester & Explainer
JavaScript (ECMAScript) RegExp — real-time matching, groups, breakdown, and cheat sheet.
Base64 / URL / JWT Codec
Encode and decode Base64, URLs, and JWTs entirely in your browser.
Diff Checker
Side-by-side and unified diffs for text, code, and JSON.
String Case Transformer
Live camelCase, PascalCase, snake_case, kebab-case, and more.
cURL to Code Converter
Paste a curl command and get fetch, axios, Python, Go, or Node.
Epoch & Timestamp Converter
Unix seconds/millis ↔ ISO 8601 ↔ human time, with timezone shifting and a live clock.
Hash & HMAC Generator
MD5, SHA-1, SHA-256, SHA-384, and SHA-512 over text or a dropped file, plus HMAC with a key.
JSON → Types
Paste a JSON sample and get a TypeScript interface, Zod schema, Go struct, or JSON Schema.
Number Base & Bitwise Playground
Bin/oct/dec/hex conversion, two's complement, and live bitwise ops across bit widths.
URL & Query String Inspector
Decompose a URL, edit params in a table, rebuild it, and encode/decode per field.
Colour Converter & Contrast
Hex / RGB / HSL / OKLCH conversion plus WCAG AA/AAA contrast pass-fail.
Escape & Unescape
HTML entities, JSON, unicode \u, regex, CSV quoting, and shell single-quotes.