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 it works
Digits 0–9 and letters A–Z represent values. Arbitrary-precision integer arithmetic avoids loss of large integer digits; output uses uppercase letters.
Try these 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.
A few good questions
How is the result produced?
Digits 0–9 and letters A–Z represent values. Arbitrary-precision integer arithmetic avoids loss of large integer digits; output uses uppercase letters.
Are my inputs sent to a server?
No. Inputs and results are processed locally and are not uploaded or included in telemetry. Copying or downloading is your choice.
What are the limits of this tool?
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.
Updated September 19, 2026