>_ DevToolKit
Fast, free developer utilities that run entirely in your browser. No tracking, no data collection, no sign-up.
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chmod Calculator
Interactive Unix file permission calculator with octal/symbolic output, common presets, security warnings, and umask calculation.
permissions octal symbolic umask
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TOML / JSON / YAML Converter
Convert between TOML, JSON, and YAML formats instantly. Auto-detect input format with clear error messages.
toml json yaml convert
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.env File Editor
Parse, edit, and convert .env files. Includes framework templates for Next.js, Django, Laravel, Express, and Rails.
env dotenv environment variables
⏰
Cron Expression Generator
Build and decode cron expressions with a visual editor, human-readable descriptions, and next execution preview.
cron crontab schedule timer
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Docker Compose Validator
Validate docker-compose.yml files with schema-aware checks. Detects invalid keys, missing services, circular dependencies, and port issues.
docker compose validate yaml