Quoted-Printable Encoder / Decoder

How to use

1. 1Choose Encode to turn plain text into quoted-printable, or Decode to turn QP text back into plain text.
2. 2Pick the variant: Quoted-Printable (RFC 2045) for email bodies, or Encoded-Word (RFC 2047) for headers like Subject.
3. 3Type or paste your text into the input area. Output updates instantly as you edit.
4. 4Use Copy to copy the result, or Use output as input to chain another encode or decode without retyping.
5. 5Load sample fills the input with a realistic UTF-8 example so you can see the encoding behavior at a glance.

About this tool

Quoted-Printable Encoder / Decoder converts between plain text and the quoted-printable (QP) form defined by RFC 2045 for MIME email bodies. QP keeps printable ASCII bytes readable and rewrites everything else as an =XX hex escape, so a UTF-8 é is written as =C3=A9 and a literal '=' is written as =3D. Encoded output is automatically wrapped at the RFC limit of 76 characters per line using soft line breaks of the form '=\r\n', which decoders join back into a single logical line. The decoder is tolerant: it accepts soft breaks written with CR, LF, or CRLF, and it accepts both uppercase and lowercase hex digits in escape sequences. A second variant covers the encoded-word form from RFC 2047 (=?utf-8?Q?...?=) used in structured mail headers like Subject and From. Encoded-word Q encoding has two extra rules on top of body QP: literal space becomes underscore, and the characters ?, _, and = always have to be escaped. The decoder recognizes the =?charset?Q?...?= wrapper, extracts the charset label, and feeds the bytes to TextDecoder so headers in UTF-8, ISO-8859-1, Windows-1252, Shift_JIS, and other supported labels decode correctly. If a byte sequence isn't valid for the declared charset it is replaced with the Unicode replacement character (U+FFFD) and the count is surfaced so you notice. Useful when debugging email delivery, when an SMTP transcript shows =E2=80=99 in the body, when an IMAP client renders a Subject like '=?utf-8?Q?Caf=C3=A9?=' literally, when migrating mailboxes through tools that round-trip MIME, when writing a custom mailer and the QP block doesn't decode the way it should, when reading raw .eml files from quarantines, or when an inbound webhook from a transactional mail provider hands you the body verbatim. Everything runs locally in your browser. Pasted content is not uploaded.

Free to use. Works in your browser. No signup, no login.