Developer tools
that run everywhere
A growing collection of free, private developer utilities. Every tool runs entirely in your browser — no servers, no tracking, no data collection. Your data never leaves your machine.
JWT Decoder
Decode and inspect JSON Web Tokens instantly. View headers, payloads, and expiration status.
CRON Generator
Build CRON expressions with visual dropdowns or parse existing expressions to natural language.
CIDR Calculator
Calculate network addresses, broadcast IPs, subnet masks, and usable host ranges.
JSON Formatter
Format, validate, and minify JSON with syntax error detection at exact line and column.
Base64 Encoder
Encode and decode Base64 strings, files, and images.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512, and HMAC hashes.
UUID Generator
Generate v1, v4, and v7 UUIDs in bulk with formatting options.
Regex Tester
Test and debug regular expressions with live matching and group capture.
Color Converter
Convert between HEX, RGB, HSL, and OKLCH with live preview.
URL Encoder
Encode and decode URL components and query strings.
Timestamp Converter
Convert Unix timestamps to dates and vice versa across timezones.
SQL Formatter
Format and beautify SQL queries with syntax highlighting.
YAML to JSON
Convert between YAML and JSON with validation.
DNS Lookup
Look up DNS records for any domain: A, AAAA, MX, TXT, CNAME.
HTML Encoder
Encode and decode HTML entities for safe embedding.
Disk Usage Visualizer
Visualize file sizes and folder structures with interactive treemaps.