Developer Toolkit

JSON, Base64, QR, regex, JWT, markdown, word count, case convert, hashes, and more — all in your browser.

API Workbench
Browser-native API client — build or paste cURL requests, inspect responses, manage collections, and store everything in IndexedDB. No backend required.
JSON Formatter
Beautify, minify, and validate JSON in your browser — private and free.
Base64 Encode / Decode
Encode text to Base64 or decode Base64 back to UTF-8 text in your browser.
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.
Hash Generator
Generate SHA-1, SHA-256, SHA-384, or SHA-512 digests in your browser with Web Crypto.
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.
JWT Decoder
Decode JSON Web Token header and payload locally — no signature verification.
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.
Word Counter
Count words, characters, sentences, paragraphs, and estimated reading time — privately in your browser.
Case Converter
Convert text to UPPERCASE, lowercase, Title Case, sentence case, camelCase, snake_case, or kebab-case.
Markdown ↔ HTML
Convert Markdown to HTML and HTML back to Markdown — locally in your browser.