Base Converter
Convert numbers between binary, decimal, hex, and other bases.
Convert numbers between binary, decimal, hex, and other bases.
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Tool guide
Free Online Number Base Converter
Convert positive integers between binary, octal, decimal, hexadecimal, and Base32 in your browser. BigInt-based parsing keeps long whole-number conversions exact while clear validation identifies digits that do not belong to the selected base.
Steps
How it works
- Choose Binary, Octal, Decimal, Hexadecimal, or Base32 as the source base.
- Choose one of the same supported bases for the output.
- Enter a positive integer using digits valid for the source base.
- Convert, copy, or download the uppercase result.
Highlights
Key features
- Supports bases 2, 8, 10, 16, and 32.
- Uses BigInt arithmetic for exact whole-number conversion.
- Accepts lowercase or uppercase letters and emits uppercase output.
- Shows a live preview for valid input.
- Reports the invalid digit when input does not match the selected base.
- Provides copy and text download actions.
Use cases
Common uses
- Convert binary values to decimal or hexadecimal.
- Translate decimal integers into binary, octal, or Base32.
- Inspect hexadecimal identifiers and bit-oriented values.
- Learn how the same integer is represented in common bases.
Notes
Limitations to know
- Only non-negative integers are supported; negative and fractional values are not.
- Radices other than 2, 8, 10, 16, and 32 are unavailable.
- Prefixes such as 0x, 0b, and 0o are not accepted and should be removed before conversion.
- Leading zeros are not retained in the output.
- The tool converts representations only; it does not perform arithmetic or Base64 text encoding.
FAQ
Frequently asked questions
Which number bases are supported?
Binary (2), octal (8), decimal (10), hexadecimal (16), and Base32 are available.
Can I convert very large integers exactly?
The converter uses BigInt, so whole-number precision is retained subject to practical browser memory and input-size limits.
Are negative or fractional numbers supported?
No. The current parser accepts non-negative whole numbers only.
Can I enter 0x or 0b prefixes?
No. Enter only the digits, then select Hexadecimal or Binary as the source base.
Why is a digit invalid for the selected base?
Each base has a limited digit set; for example, binary accepts only 0 and 1, while hexadecimal accepts 0-9 and A-F.