Free online utilities
yutils
Developer and everyday tools that run entirely in your browser. Your data never leaves your device.
Categories
Time
7- Unix Timestamp ConverterTime
Convert between Unix timestamps (seconds/milliseconds) and ISO 8601 / UTC / locale time. Auto-detects input.
- Cron Expression ParserTime
Translate a cron expression into human-readable text and preview the next 5 run times. Locale-aware.
- Cron Expression BuilderTime
Build a cron expression visually — pick minute / hour / day / month / weekday from presets or free input. Preview human-readable text and next 5 run times.
- Time Zone ConverterTime
Convert datetime between IANA time zones using the browser's Intl API.
- Date FormatterTime
Format a date with patterns (YYYY-MM-DD HH:mm:ss). Live preview of common formats.
- Date CalculatorTime
Four modes — duration between two dates, date ± N days, days → Y/M/D breakdown, and a persistent D-day list.
- Pomodoro TimerTime
Full-screen Pomodoro timer that alternates focus and break sessions. Custom durations, color, sound, and fullscreen for desk use.