Binary to Base32 Converter

Summary

This tool converts raw binary strings (sequences of 0s and 1s) into Base32 encoding as defined by RFC 4648. Base32 uses a 32-character alphabet (A-Z and 2-7) and pads output to multiples of 8 characters with = signs. It is commonly used in TOTP secrets, file checksums, and data encoding where case-insensitive text representation is required.

How it works

1. Enter or paste your binary string (e.g. 01001000 01100101) into the input field.
2. The tool groups the binary digits into 5-bit chunks.
3. Each 5-bit group maps to a character in the Base32 alphabet (A-Z, 2-7).
4. Padding characters (=) are appended so the output length is a multiple of 8.
5. The resulting Base32 string is displayed and ready to copy.

Use cases

• Convert binary data to Base32 for use in TOTP/2FA secret keys.
• Encode binary payloads for case-insensitive transmission.
• Verify Base32 encoding logic when debugging authentication libraries.
• Learn how RFC 4648 Base32 encoding works step by step.
• Encode binary checksums or hashes in a compact text form.
• Convert binary representations from bitwise operations into Base32.

Frequently Asked Questions