How to encode text as Quoted-Printable for email transport

1. Paste the text

   Drop the source string into the "Text" field. The tool encodes any byte outside the printable-ASCII range (`!`–`~` minus `=`) using `=XX` escapes, where `XX` is the two-digit upper-case hex byte value.

2. Press Run

   Result returns a single `encoded` field. Examples: `café` → `caf=C3=A9`; literal `=` → `=3D`. Lines longer than 76 characters get a soft line break `=\r\n` inserted; mail transfer agents preserve those across hops.

3. When QP makes sense

   Quoted-Printable is used in email headers and bodies (`Content-Transfer-Encoding: quoted-printable`) when the content is mostly ASCII with the occasional non-ASCII character. For binary data, base64 is more efficient.

4. Watch the trailing whitespace

   Tabs and spaces at the end of a line MUST be encoded (`=20`, `=09`) — otherwise some mail relays strip them. The encoder handles this for you, but if you're hand-editing, don't trim trailing whitespace from QP-encoded content.