Number Base Converter
binary, octal, decimal & hex
Free forever — no sign-up, nothing uploaded. Files never leave your device.
Number Base Converter
binary, octal, decimal & hex
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Browse filesdocument.pdf
1.2 MB
report.pdf
860 KB
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About this tool
Convert numbers between bases 2–36 using arbitrary-precision BigInt math, with ASCII/Unicode lookup.
The Number Base Converter reads an integer in any base from 2 to 36 and shows the same value in binary, octal, decimal and hexadecimal, plus its Unicode code point. Type the digits, choose the base they are written in, and every representation appears at once.
Conversion uses arbitrary-precision BigInt arithmetic, so values far larger than 64 bits stay exact — there is no floating-point rounding to hide. A leading + or - sets the sign, and the radix prefixes 0b, 0o and 0x are stripped only when they match the base you selected: 0b11 is binary in base 2, while in base 16 the digits 0b are an ordinary hexadecimal number worth 0xB11.
Fractions, two's complement and bit-length or grouping views are not offered; this is an integer base converter, not a fixed-width register display. Everything runs in the tab — nothing you type is uploaded.
Key features
Everything you get with Number Base Converter — no premium upsell.
Binary, octal, decimal and hexadecimal output for one value, plus its Unicode code point
Input base selectable from 2 to 36
Arbitrary-precision BigInt — exact well beyond 64 bits
Leading + or -, with 0b / 0o / 0x stripped only when they match the selected base
An invalid digit is reported and named rather than the value being guessed
Client-side only — no number leaves your browser
How to use Number Base Converter
Follow the steps below to use the tool.
- 1
Enter a number
Type the digits you want to convert. They may be binary, octal, decimal, hexadecimal or any base up to 36; the selector says which.
- 2
Choose the input base
Set the base the digits are written in. A matching prefix (0b, 0o, 0x) is optional and is stripped; a prefix for a different base is treated as ordinary digits.
- 3
Read every representation
Binary, octal, decimal, hexadecimal and the Unicode code point update as you type. Values outside U+0000 to U+10FFFF show a dash for the code point.
- 4
Copy any representation
Click the copy button next to any base representation to grab it for your code, calculations or documentation.
Still free, still private — your files never leave your device.
Launch Number Base ConverterFrequently asked questions
Quick answers before you launch the tool.
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