Email was built for plain ASCII text, yet real messages constantly carry accented letters, symbols, and long lines that plain ASCII cannot express. Quoted-printable is the MIME encoding that bridges that gap: readable text stays readable, while anything outside the safe ASCII range is written as an equals sign followed by two hex digits. That is why you see sequences like =C3=A9 in raw email source where an accented letter belongs, and why a stray equals sign in a message body must itself be encoded as =3D. This tool encodes and decodes quoted-printable text in your browser, so you can inspect a raw message, repair a mangled body, or prepare text for a MIME part without installing anything.
Quick Answer: Enter Hello=World and the tool returns Hello=3DWorld.
Free Online Tool
Quoted-Printable Encoder / Decoder
Encode text to MIME quoted-printable form, or decode quoted-printable back to plain text.
Equals signs and non-ASCII bytes become =XX hex codes; soft line breaks (= at end of line) are removed on decode.
How to Use the Quoted-Printable Encoder / Decoder
- Enter your input in the tool above — for example, Hello=World.
- Choose any options the tool offers, such as the conversion direction or the settings that fit your case.
- Click the main button to run the tool and read the result it displays.
- Check the result against what you expected, then adjust the input and run it again if needed.
- Copy the output into your own document, code, or configuration wherever you need it.
Worked Example
Try it with Hello=World: the tool returns Hello=3DWorld. That example is a good first test whenever you use the tool, because it confirms you entered the input in the expected format before you trust it with your real values. This tool is built for inspecting raw email source and debugging MIME message bodies, and the worked example shows the shape of a correct result so you can recognize a wrong one at a glance.
Key Features
- Runs entirely in your browser — nothing you type is uploaded anywhere.
- Built for inspecting raw email source and debugging MIME message bodies, with the result shown immediately and in full.
- No account, no sign-up, and no software to install.
- Clear error messages when an input is incomplete or in the wrong format.
- Free to use as often as you like, for study, work, or checking homework.
Best Practices and Tips
- Start with the worked example in the guide, then substitute your own values.
- Double-check units and formats before trusting a result — most tool errors are input errors.
- Keep a note of the exact inputs that produced a result you rely on, so you can reproduce it.
- For anything important, cross-check with a second method or a known test value.
- Bookmark the tool if you use it regularly, so the same workflow is always one click away.
Common Mistakes to Avoid
- Forgetting that a literal equals sign must be encoded as =3D, which corrupts decoding.
- Treating soft line breaks (a lone = at end of line) as real content instead of removing them.
- Copying a result without checking it against a known example first.
- Assuming the tool knows your context — it only sees the values you enter.
When This Tool Helps — and When It Doesn’t
This tool helps most when you need a fast, checkable answer for inspecting raw email source and debugging MIME message bodies and you can verify the result against a known example. It does not replace professional judgment: for decisions with real consequences, treat the output as one input among several, verify it independently, and remember that the tool can only work with exactly what you enter. Used that way — quick check, verified result, human decision — it saves time without creating false confidence.
Frequently Asked Questions
What is quoted-printable used for?
It is a MIME content-transfer encoding for email. Mostly-ASCII text stays human-readable, while bytes outside the safe range become =XX hex codes, so older mail systems that only handle 7-bit ASCII can still carry the message intact.
Why does decoded text sometimes show =XX sequences?
That happens when the text was never actually quoted-printable, or when decoding stopped early. If the input contains a real equals sign that was not encoded as =3D, a decoder will misread the following characters as a hex code.
Is quoted-printable the same as Base64?
No. Base64 rewrites everything into an unreadable alphabet, while quoted-printable leaves ordinary text untouched and only escapes what it must. Quoted-printable suits mostly-text content; Base64 suits binary attachments.