RFC 2045 · MIME · =XX encoding
Encodes non-ASCII bytes as =XX hex pairs while keeping most ASCII text readable. Used in email (MIME) bodies and anywhere you need mostly-readable binary-to-text. Line length limit per RFC 2045.
Text → Quoted-Printable box — the encoded result appears instantly in the Quoted-Printable output.Copy result to copy the encoded output to your clipboard.Quoted-Printable → Text box and the plain text appears in Decoded text.Encode all bytes (hex dump mode) to force every byte into a =XX pair, or set Line width to change where soft line breaks are inserted (default 76).Clear any time to reset a box and start over.Email clients encode message bodies in quoted-printable. Read and write the exact =XX sequences you see in raw email source.
Only non-printable bytes are escaped, so ASCII stays human-readable while any high or control bytes are safely represented.
With Encode all bytes (hex dump mode), every byte becomes a =XX pair so you can see the exact underlying byte values.
Accents, emoji, and non-Latin scripts are encoded as their UTF-8 bytes, so any text survives transport across 7-bit systems.
Control the soft line break width (default 76) to match the standard's 76-character line recommendation for MIME bodies.
Everything runs in your browser. Nothing is uploaded, logged, or sent to a server — safe for sensitive payloads.
Quoted-printable is a MIME content-transfer encoding defined in RFC 2045. It keeps printable ASCII characters unchanged and encodes other bytes as =XX hexadecimal pairs, making it ideal for email bodies that are mostly text.
In default mode, printable ASCII (including space and tab) passes through unchanged — except =, which is escaped. Any other byte (control characters, bytes ≥ 127) is replaced by = followed by its two uppercase hex digits.
= become =3D?The = character introduces an escape sequence, so a literal = must itself be escaped. 3D is the hexadecimal value of the ASCII = character.
=)?Quoted-printable lines are limited in length. When a line wraps, a = is placed at the end of the line and the next line continues — the decoder joins them back together. A =XX pair never spans a line break.
No. Quoted-printable is fully reversible and provides no confidentiality. It's a transport encoding for safely moving bytes through text-only channels, not a way to hide data.
Yes. Input is converted to UTF-8 bytes first, so accented characters and emoji are encoded as one or more =XX pairs and decoded back to the original text.
Never. All encoding and decoding runs locally in JavaScript. Your input is not sent to, stored on, or logged by any server.