Number base converter
Convert integers between binary, decimal, hexadecimal and bases from 2 to 36.
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How we handle your data →How to use this tool
- Enter an integer without 0x, 0b or separators.
- Choose input and output bases from 2 to 36.
- Check the sign and remember that leading zeros are normalized.
An example you can verify
Convert a hexadecimal value to decimal without losing precision.
Example input
FF
Expected result
255
F represents 15: 15 × 16 + 15 = 255. In base 2 the same number is 11111111.
Settings and limits
Enter an integer and choose its input and output bases. Digits are 0–9 and letters A–Z, without 0x or 0b prefixes, internal spaces or fractional parts. Supports + or − signs and up to 2,048 digits. Arbitrary-precision integer arithmetic retains exact values for large numbers.
Frequently asked questions
Are leading zeros retained?
No. It converts the numeric value and returns a normalized representation. Output letters are uppercase and negative zero becomes 0.
Are my data stored on a server?
No. Content and files are processed in your browser without an account. Closing the page loses unsaved results.