Number Base Converter
Type a whole number in decimal, hexadecimal, binary or octal and see it in all four. Prefixes 0x, 0b and 0o are stripped. Whole numbers up to 9,007,199,254,740,991.
Frequently asked questions
Why is there an upper limit?
Browsers hold whole numbers exactly up to 9,007,199,254,740,991 (2^53 − 1). Above that digits would be silently wrong, so the tool refuses instead.
Are negative numbers or fractions supported?
No. Whole numbers from 0 only. A decimal point or a minus sign shows an error rather than a guess.