Base32编码与解码工具

编码和解码Base32字符串：常用于TOTP密钥、DNS记录以及不区分大小写的标识符。

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个字母数字字符（A-Z、2-7）对二进制数据进行编码。与Base64不同，它不区分大小写，并避免使用视觉上易混淆的字符（0/O、1/I/l），因此适合手写或口头传输。它主要用于2FA密钥和DNS记录。

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.

为什么用Base32而不用Base64？▼

Base32不那么紧凑（每5个字节用8个字符，而Base64每3个字节用4个字符），但它不区分大小写：对人来说更容易转录。