Email preflightAyyoub BoufounasGrowth, CRM & automation

UTF-8 email subject decoder

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Email header to text

Decode a UTF-8 email subject from Base64 (B) or Q into readable text. Folded header lines are supported.

Before
=?UTF-8?B?Q2Fmw6k=?=
After
Café
What do B and Q mean?

They are the two RFC 2047 email header encodings. B uses Base64; Q represents some bytes with an equals sign and hexadecimal digits. Both carry the same subject text. For example, =?UTF-8?Q?Caf=C3=A9?= also means Café.

Why is the subject encoded?

RFC 2047 represents non-ASCII characters in email headers. Most email apps decode them automatically. Keep an untouched copy of your source; malformed input or unsupported charsets may be rejected.

RFC 2047 specification

Ayyoub Boufounas

Growth, CRM & email automation.

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