Base 2–36 Converter

Convert integers between binary, octal, decimal, hexadecimal and other supported positional number bases. Processing takes place locally in your browser.

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Base 2–36 Converter

Enter an integer, for example FF. Use 0–9 and A–Z; a leading minus sign is allowed.
Set the source base to 16 and the target base to 10. Both bases must be integers from 2 to 36.
Convert and check that FF becomes 255. The result also shows binary, octal, decimal and hexadecimal values.

FF (16) → 255 (10)
255 (10) → FF (16)
-1010 (2) → -A (16)
Z (36) → 35 (10)
255 (10) = 11111111 (2) = 377 (8) = FF (16)

Limits

Conversion uses BigInt and keeps large integers exact, with a limit of 10,000 digits. Fractions, 0x prefixes, scientific notation and separators inside the number are not supported. Leading zeroes are removed. Processing stays in this browser.

Choose the right tool

Base 2–36 Converter
Convert integers between binary, octal, decimal, hexadecimal and other supported positional number bases.
Binary Converter
Convert between binary and decimal
Hexadecimal Converter
Convert between hexadecimal and decimal

The 10000-digit limit excludes a leading minus sign and outer whitespace. Enter ASCII digits 0–9 and Latin letters A–Z; lowercase is accepted. Each digit must be smaller than the source base: 2 is invalid in base 2, and F is invalid in base 10. Letters mean values 10–35. Scientific notation is not interpreted: 1E3 in base 16 is the integer 483, not 1000. The string 0X is valid digits in base 36 and equals 33; it is never treated as a hexadecimal prefix. A leading plus sign is not accepted.

Convert signed integers exactly between bases 2–36 with BigInt. Up to 10000 digits, excluding the minus sign. Swap bases: 16 ↔ 2.

FF (16) → 11111111 (2) = 255 (10)

Processing takes place locally in your browser.