PIPELINE Encoding & Decoding Intermediate 2 steps

Convert MIME to Quoted-Printable

Email headers often use MIME encoded-word syntax (=?charset?B?...?=) while email bodies use Quoted-Printable. When moving a decoded header value into a body, this chain first decodes the MIME encoding to recover the original text, then re-encodes it as Quoted-Printable so that non-ASCII characters survive transport through 7-bit mail gateways.

What it solves

Decode a MIME-encoded header value and re-encode it as Quoted-Printable for email body transport.

Input → Output

MIME Decoder input → Quoted-Printable Encoder output across 2 steps.

Runs in

1–2 minutes · fully local in your browser.

Before you start

A MIME encoded-word string from an email header

The pipeline

1 MIME Decoder mime-decode

Decode MIME-encoded text (Base64 or Quoted-Printable) back to original content. Free, private, and 100% client-side.
2 Quoted-Printable Encoder quoted-printable-encode

Encode text to Quoted-Printable format (RFC 2045). Free, private, and 100% client-side.

Open in Toolchain

Runs locally in your browser. The recipe defines the pipeline only — your input never leaves this tab.

▶Run this workflow

Enter your input below and click Run. All processing happens locally in your browser — nothing is uploaded.

Input data

Pipeline progress

MIME Decodermime-decode
Quoted-Printable Encoderquoted-printable-encode

Sample input

=?UTF-8?B?SGVsbG8gV29ybGQ=?=

Expected output

Q1|=05!=D5=B1=D1=BC]=DD=89=D1=90

This pair is executed against the real tools at build time (tests/unit/recipes.test.ts) — the expected output is verified, not illustrative.

You might also need

Workflows sharing tools or topics with this recipe.

Base64 encode then decode round-trip

Encode text to Base64 and decode it back to verify the round-trip preserves the original data.

Convert Base64 to Hex

Decode a Base64 string into raw bytes and re-encode it as hexadecimal for inspection or interop.

AES encrypt then Base64 encode

Encrypt plaintext with AES and encode the ciphertext as Base64 for text-safe transport.

Decode and format a JWT payload

Parse a JWT token, extract its payload, and format the JSON for inspection.

Learn more

How to Use MIME Encoding

Encode and decode MIME (Base64 with line breaks) for email attachments and multipart messages.

Understanding Quoted-Printable Encoding

Learn how Quoted-Printable encoding works and when it is preferable to Base64 for mostly-ASCII text.

Tools used

Decode MIME-encoded text (Base64 or Quoted-Printable) back to original content. Free, private, and 100% client-side.

Quoted-Printable Encoder

Encode text to Quoted-Printable format (RFC 2045). Free, private, and 100% client-side.