MIME Header Decoder — Free Online Tool
Decode email headers encoded per RFC 2047, the standard for non-ASCII characters in email headers (Subject, From, To). Supports both Base64 (=?UTF-8?B?...?=) and Q-encoded (=?UTF-8?Q?...?=) formats.
100% client-side. No uploads. Your data never leaves your browser.
How to use MIME Header Decoder
- Paste a MIME-encoded header.
- Click Decode.
- See the decoded text.
Frequently Asked Questions
What is RFC 2047 encoding?
RFC 2047 allows non-ASCII characters in email headers by encoding them as =?charset?B?base64data?= or =?charset?Q?qp-data?=.
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