Developer Tools
Free, fast, no-signup tools for developers. All processing happens in your browser — your data never leaves your machine.
YAML ↔ JSON Converter
Convert between YAML and JSON instantly. Supports nested structures, comments preservation, and real-time preview.
Base64 Encoder / Decoder
Encode or decode Base64 strings. Useful for data URIs, API auth tokens, and binary-to-text conversion.
Cron Expression Builder
Build and validate cron expressions with a visual editor. See next execution times and human-readable descriptions.
CIDR Subnet Calculator
Calculate subnet ranges, usable IPs, broadcast addresses, and more from any CIDR notation or IP range.
Strong Password Generator
Generate cryptographically secure passwords with custom length and character sets. Uses Web Crypto API — all processing is local.
All tools are free and run entirely in your browser. No data is ever sent to our servers.