DEVELOPER UTILITIES
Quick-reference tools for everyday developer tasks. Every result is mathematically exact. Nothing leaves your device.
UUID GENERATOR
Generate RFC 4122 version 4 UUIDs using your browser's cryptographically secure random source.
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Click UUID to copy · Generates a fresh UUID each time
CRON EXPRESSION BUILDER
Build cron expressions visually. Edit any field directly — see the expression and plain English description update live.
* * * * *
Every minute
Minute
0–59
Hour
0–23
Day (Month)
1–31
Month
1–12
Day (Week)
0–6 (Sun=0)
NUMBER BASE CONVERTER
Type in any base — all others update instantly. Decimal, binary, hex, octal, and custom bases.
Decimal Base 10
Hexadecimal Base 16
Binary Base 2
Octal Base 8
Custom Base Base 32
Base
BYTE SIZE CALCULATOR
Enter a value in any unit — all conversions update instantly. Click any row to copy. Uses base-10 (SI) and base-2 (IEC) standards.