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Base32 Encoder & Decoder

Encode and decode Base32 (RFC 4648) — used by TOTP secrets and case-insensitive identifiers.

To encode Base32, paste your text and the RFC 4648 encoded string appears. Base32 uses only uppercase letters and digits 2 to 7, making it case-insensitive and safe to read aloud or type by hand — which is why TOTP two-factor secrets use it.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Where is Base32 used?

TOTP authenticator secrets, Tor addresses and some DNS records. Its alphabet excludes easily confused characters and is case-insensitive, which makes it safe to type by hand and to put in a case-insensitive system like DNS.

How to use the base32 encoder & decoder

  1. 1Enter or paste your text or base32.
  2. 2Choose the direction.
  3. 3The result appears immediately — copy or download it.

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Put the working base32 encoder & decoder on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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