Quoted Printable Decoder
Decode quoted-printable email bodies and =?UTF-8?B?...?= encoded subject lines, or encode text for a body or a header.
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Input
Decode quoted-printable and MIME encoded words
Output
Decoded
151 characters
Quoted-printable (RFC 2045) keeps ASCII readable and writes every other byte as =XX, breaking lines at 76 characters with a trailing = that is removed on decoding. Headers cannot carry raw UTF-8, so a non-ASCII subject is sent as an encoded word (RFC 2047): =?charset?B?base64?= or =?charset?Q?...?=. A stray =20 or =3D in a message means a client showed the encoded form.
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About this tool
Method, assumptions, practical next steps, and limits.
Why email does this
SMTP was designed for 7-bit ASCII lines, so anything else is encoded. Quoted-printable (RFC 2045) keeps mostly-ASCII text readable and encodes the rest; headers use encoded words (RFC 2047) because they cannot carry a Content-Transfer-Encoding. When a message shows =20, =3D or =C3=A9 in a client, a layer of this decoding was skipped.
Debugging generated mail
Mailpit and similar catchers show the raw source. Decoding it here confirms whether a garbled character was wrong when the application built the message or only displayed wrongly.