Base32 Encode - Convert Text to Base32 Online
Base32 Encode
Fast and Secure Base32 Encoding in your Browser
Understanding Base32 Encoding
TOTP & 2FA Secrets
Base32 is the standard encoding for authenticator app secret keys (RFC 4648), since it avoids visually ambiguous characters.
DNS-Safe Identifiers
Unlike Base64, Base32's output is case-insensitive and uses only alphanumeric characters, making it safe for DNS labels and filenames.
Human Readability
The alphabet excludes easily confused characters like 0/O and 1/I, reducing transcription errors when read aloud or typed manually.
Data Encoding
Commonly used in cryptographic applications, backup codes, and systems where case sensitivity cannot be guaranteed.
Why Base32 Instead of Base64?
Base32 trades some efficiency (a 60% size increase vs Base64's 33%) for greater human-friendliness: no mixed case, no symbols like + or /, and a smaller, less ambiguous alphabet. This makes it the preferred choice for secrets that a person might need to type by hand.
Key Takeaways
- RFC 4648 Standard: This tool implements the standard Base32 alphabet (A-Z, 2-7) with '=' padding.
- Case-Insensitive: Base32 output is safe to use in environments that don't preserve letter casing.
- Client-Side Only: All encoding happens locally in your browser — no data is ever sent to a server.