EML Viewer (Open EML Files Online)

An .eml file is a complete email in its original internet format: what Thunderbird, Apple Mail and Windows Mail save, and what Gmail's "Download message" gives you. This viewer opens one in your browser without any mail program. It decodes the headers (From, To, Cc, Date, Subject), the text and HTML bodies, attachments and attached emails, including Korean (EUC-KR, ks_c_5601-1987), Japanese (ISO-2022-JP, Shift_JIS) and other character sets. You can also save it as a clean HTML page or a text file.

How to use this tool

1. Choose the .eml file, or paste the raw message source.
2. Read the sender, recipients, date, subject and text.
3. Open "Message as HTML" for the formatted version, or download the .txt.
4. Download any attachment; attached emails come out as .eml files you can open here again.

Formula

message = header lines (folded lines joined) + blank line + body; multipart bodies are split at --boundary lines; each part is base64, quoted-printable or 8-bit

Headers follow RFC 5322, and encoded words such as =?UTF-8?B?…?= or =?euc-kr?Q?…?= are decoded per RFC 2047. Attachment names may use RFC 2231 (filename*=utf-8''…). Bodies follow MIME (RFC 2045–2046): multipart/mixed, alternative and related are walked recursively, and pictures referenced as cid: are placed into the HTML copy. Text without a declared character set is tried as UTF-8, then as Korean CP949. The HTML copy has scripts and event handlers removed and blocks remote pictures.

Example

A message whose raw subject is =?euc-kr?B?x9Gx2w==?= test and whose sender is =?UTF-8?B?7ZWc6riA?= <han@example.com> shows Subject 한글 test and From 한글 <han@example.com>. Its quoted-printable text Caf=C3=A9 =E2=82=AC5 reads Café €5, and the attachment named with filename*=utf-8''%ED%95%9C.txt downloads as 한.txt.