About this number base converter
Convert signed whole numbers between bases 2 through 36 exactly. Digits 0–9 and letters A–Z represent values. Arbitrary-precision integer arithmetic avoids loss of large integer digits; output uses uppercase letters. Use this workspace to prepare a result you can review before putting it to use. All processing takes place on your device, without an account or an upload of your inputs. Check the examples to understand the expected output, read the limitations for the supported scope, and reset the form when you want to start a separate task.
How the number base converter works
Digits 0–9 and letters A–Z represent values. Arbitrary-precision integer arithmetic avoids loss of large integer digits; output uses uppercase letters.
Number Base Converter examples
255; base 10 → base 16
FF
-101; base 2 → base 10
-5
Limitations & privacy
Up to 256 input digits, optional leading minus sign. No fractions, separators or base prefixes such as 0x. Bases must be whole numbers from 2 to 36.
Inputs and results stay in this browser. Only tool identifiers are stored for your recently used tools. You can clear that history from the directory.
Number Base Converter: frequently asked questions
How does the number base converter work?
Digits 0–9 and letters A–Z represent values. Arbitrary-precision integer arithmetic avoids loss of large integer digits; output uses uppercase letters.
What can I inspect in the number base converter result?
The the same integer in common bases helps you check the result before using it. Up to 256 input digits, optional leading minus sign. No fractions, separators or base prefixes such as 0x. Bases must be whole numbers from 2 to 36.
Does the number base converter upload my input?
Processing happens in your browser. No tool input or output is uploaded to a server. Use Reset to clear the current workspace before starting a separate task.
Updated September 20, 2026