Base32 Decode – Online Decoder

Convert Base32 encoded strings back to readable text or original binary files. Our Base32 decoder handles padding, different case, and line breaks automatically.

How Base32 Decoding Works

Base32 decoding reverses the encoding process: each character is mapped to a 5‑bit value, groups are concatenated, then split into 8‑bit bytes. Padding (=) indicates the number of missing bits. The result is either UTF‑8 text or binary data.

Example Decoding

Input Base32: JBSWY3DP
Decoded text: "Hello"

Input Base32: NBSWY3DPEB3W64TMMQ======
Decoded text: "Hello World"

Code Example

// Python
import base64
encoded = "JBSWY3DP"
decoded = base64.b32decode(encoded).decode()
print(decoded)  # Hello

// JavaScript (Node.js)
const decoded = Buffer.from("JBSWY3DP", "base32").toString();
console.log(decoded);  // Hello

Advanced Options

• Input padding: automatically corrected
• Case handling: lowercase inputs are uppercased
• Line break removal: spaces, tabs, newlines ignored
• Output format: text (UTF-8) or binary file

Use Cases

Decode Base32 strings from:

• Google Authenticator secret keys (TOTP)
• DNS zone file binary data
• Steam or other platform IDs
• QR codes containing Base32 payloads
• Configuration files using Base32 encoding

Our decoder is fully RFC 4648 compliant. Invalid characters are reported with the exact position. All uploaded data is automatically deleted after 1 hour.