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Base64 Decoder for Email Headers

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Email headers with non-ASCII characters use Base64 (RFC 2047). Decode locally.

Example

=?UTF-8?B?5oKo44Gu5rOo5paH44GM56K65a6a44GV44KM44G+44GX44Gf?=
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Tips

  1. 1Format: =?charset?B?data?=
  2. 2Q encoding is different.
  3. 3Decode segments individually.

Frequently Asked Questions

What is =?UTF-8?B?...?=?

MIME encoded word: charset, Base64 encoding, content.

Decode attachments?

Yes. Extract Base64 block and decode.

Why encoded?

SMTP is ASCII-only. Non-ASCII must be encoded.