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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report.pdf
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About this tool
Convert numbers between bases 2–36 using arbitrary-precision BigInt math, with ASCII/Unicode lookup.
The BrainCoder Number Base Converter transforms numbers between binary (base 2), octal (base 8), decimal (base 10), hexadecimal (base 16), and any custom base from 2 to 64. This is essential for programmers, computer scientists, and anyone working with different number systems.
Understanding number bases is fundamental to computing. Binary represents data at the hardware level, hexadecimal provides a compact human-readable form of binary, and decimal is the base we use in everyday life. This tool converts between all of them instantly, showing all representations simultaneously so you can see how the same value appears in different bases.
The converter also handles fractional numbers (like 3.14 in different bases), signed integers (two's complement), and large numbers. It displays the bit-length and provides grouping options for readability. All conversions happen locally in your browser — no data is transmitted.
Key features
Everything you get with Number Base Converter — no premium upsell.
Convert between binary, octal, decimal, and hex
Custom base support (2-64)
Fractional number conversion
Signed integer (two's complement) display
Bit-length and grouping information
All conversions client-side
How to use Number Base Converter
Follow the steps below to use the tool.
- 1
Enter a number
Type a number in any base — the tool auto-detects binary (0s and 1s), octal (0-7), decimal, or hex (0-9, A-F) based on the input.
- 2
Select source base if needed
If the auto-detection is incorrect, manually select the base your number is in using the base selector.
- 3
View all representations
The tool instantly shows your number in binary, octal, decimal, hexadecimal, and any custom base you specify.
- 4
Copy any representation
Click the copy button next to any base representation to grab it for use in your code, calculations, or documentation.
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Launch Number Base ConverterFrequently asked questions
Quick answers before you launch the tool.
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