Base32 編碼與解碼工具

編碼和解碼 Base32 字串：常用於 TOTP 金鑰、DNS 記錄以及不區分大小寫的識別碼。

如何使用本工具

1
Choose 'Encode' to turn text into Base32, or 'Decode' to turn Base32 back into text, using the mode dropdown.
2
Type or paste your input into the text box — UTF-8 text when encoding, or a Base32 string when decoding.
3
Read the result in the gray output panel below; it updates instantly as you type, with no button to press.
4
Select and copy the output text to use it elsewhere.

Base32 使用 32 個英數字元（A-Z、2-7）對二進位資料進行編碼。與 Base64 不同，它不區分大小寫，並避免使用視覺上易混淆的字元（0/O、1/I/l），因此適合手寫或口頭傳輸。它主要用於 2FA 金鑰和 DNS 記錄。

Inspecting a TOTP/2FA setup string by decoding the Base32 secret an authenticator app expects.
Encoding a short identifier into a case-insensitive form safe to drop into a DNS label or subdomain.
Hand-checking the output of a server library against a known-good Base32 implementation while debugging.
Producing tokens or codes meant to be read aloud or typed without confusing 0/O or 1/I/l.
Decoding a Base32 string copied from a config file or QR-code payload to see the underlying text.
Teaching or learning how bit-level encodings group data, by watching how input maps to 5-bit chunks.

為什麼用 Base32 而不用 Base64？▼

Base32 不那麼精簡（每 5 個位元組用 8 個字元，而 Base64 每 3 個位元組用 4 個字元），但它不區分大小寫：對人來說更容易轉錄。