What characters are valid in base-32?

Base-32 uses 32 symbols: digits 0-9 (values 0-9) and letters A-V (values 10-31). Input is case-insensitive. Any other character is invalid and will show an error.

What characters are valid in base-36?

Base-36 uses 36 symbols: digits 0-9 (values 0-9) and letters A-Z (values 10-35). The output is displayed in uppercase. This is the largest single-digit-per-symbol base that uses only alphanumeric ASCII characters.

Is there a limit on the size of input numbers?

No practical limit — the tool uses JavaScript BigInt which handles arbitrarily large integers without floating-point precision loss.

Does conversion work in both directions?

Yes. Use the swap button to convert base-36 back to base-32. The same algorithm applies in reverse.

Why is base-36 useful?

Base-36 produces shorter strings than decimal or hex for large numbers while remaining fully alphanumeric — no special characters — making it ideal for URL slugs, short codes, and identifiers.

Base32 to Base36 Converter

Paste a base-32 number and instantly get its base-36 equivalent — all computed client-side.

Base-32 Input

Digits: 0-9, A-V

Enter base-32 value

Direction: Base-32 → Base-36

Quick examples

Base-36 Output

Enter a base-32 value and click Convert

Conversion Breakdown

Step	Value

Copied!

Summary

This tool converts numbers written in base-32 (digits 0-9 and letters A-V) into base-36 (digits 0-9 and letters A-Z). The conversion happens entirely in your browser using JavaScript BigInt arithmetic, so no data is sent to any server. Useful for working with alternative numeral systems, encoding schemes, or educational exploration of number bases.

How it works

Enter a base-32 value in the input field (valid characters: 0-9, A-V, case-insensitive).
The tool parses each digit of the base-32 number and computes its decimal (base-10) equivalent using BigInt.
The decimal value is then re-encoded into base-36 using digits 0-9 followed by letters A-Z.
The result appears instantly with a copy button and a breakdown table showing intermediate decimal value.
Use the swap button to reverse direction and convert base-36 back to base-32.

Use cases

Translating compact identifiers between different encoding schemes.
Academic exercises on positional numeral systems and radix conversion.
Verifying manual base conversion calculations.
Exploring how the same integer looks in base-32 vs. base-36.
Working with legacy systems that use non-standard number bases.
Generating shorter alphanumeric representations of numeric IDs.

Frequently Asked Questions

Last updated: 2026-05-28 · Reviewed by Nham Vu