What characters are valid in the input?

Only 0 and 1 digits. Spaces and newlines are stripped automatically so you can paste formatted binary like "01001000 01100101".

What is the Base32 alphabet used?

RFC 4648 Base32 uses uppercase letters A through Z and digits 2 through 7. Padding is done with the = character.

Why does the output end with = signs?

Base32 encodes 5 bits per character. When the input length is not a multiple of 40 bits, padding characters are added so the output length is always a multiple of 8.

Is this the same Base32 used by Google Authenticator?

Yes. Google Authenticator and most TOTP apps use RFC 4648 Base32 for secret keys, which is exactly what this tool produces.

What is the maximum input size?

The tool handles inputs up to 10,000 binary digits in the browser without any server calls. Larger inputs may slow rendering slightly.

Binary to Base32 Converter

Name: Binary to Base32 Converter
Availability: InStock
Author: Nham Vu

Paste a binary string (0s and 1s) and instantly get the RFC 4648 Base32 encoded output.

Binary Input

Examples:

Base32 Output

Summary

Paste a binary string (0s and 1s) and instantly get the RFC 4648 Base32 encoded output.

How it works

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

Related tools

2fa Base64 Encode Hex To Binary

Last updated: 2026-05-23 · Reviewed by Nham Vu