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Number Base Converter

Binary, octal, decimal and hexadecimal in real-time
Input non valido per questa base.

How to convert between number bases

Computers work in binary (base 2), but humans read decimal (base 10) better. Hexadecimal (base 16) is used to represent bytes compactly (e.g. CSS colors, memory addresses). Octal (base 8) is less common but appears in Unix permissions. Our tool converts instantly between all four bases: type in one field and the others update.

Common bases table

  • Binary: uses 0 and 1 — computers' native language
  • Octal: uses 0-7 — Linux file permissions (e.g. 755)
  • Decimal: uses 0-9 — everyday use
  • Hexadecimal: uses 0-9 and A-F — web colors, memory addresses, crypto keys

Frequently asked questions

What is the maximum supported value?

The tool uses 53-bit precision integer numbers (JavaScript Number), so it handles values up to about 9 × 10^15 without precision loss.