Developer Tools

API Workbench

Browser-native API client — build or paste cURL requests, inspect responses, manage collections, and store everything in IndexedDB. No backend required.

Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to UTF-8 text in your browser.

Case Converter

Convert text to UPPERCASE, lowercase, Title Case, sentence case, camelCase, snake_case, or kebab-case.

Color Contrast Checker

Check WCAG 2 contrast ratios between foreground and background hex colors.

Cron Expression Explainer

Explain standard 5-field cron schedules in plain language.

Hash Generator

Generate SHA-1, SHA-256, SHA-384, or SHA-512 digests in your browser with Web Crypto.

JSON Formatter

Beautify, minify, and validate JSON in your browser — private and free.

JWT Decoder

Decode JSON Web Token header and payload locally — no signature verification.

Markdown ↔ HTML

Convert Markdown to HTML and HTML back to Markdown — locally in your browser.

Password Generator

Generate strong random passwords locally with configurable length and character sets.

QR Code Generator

Generate a downloadable QR code from text or a URL — entirely in your browser.

Regex Tester

Test JavaScript regular expressions against sample text and inspect matches.

URL Encode / Decode

Percent-encode or decode URL components safely in your browser.

UUID Generator

Generate one or many RFC 4122 UUID v4 identifiers with Web Crypto.

Word Counter

Count words, characters, sentences, paragraphs, and estimated reading time — privately in your browser.