What it does
An .eml file is one email in RFC 822 / MIME format. This viewer parses the headers, walks the MIME tree, decodes each part (quoted-printable, base64, and the declared character set), and shows the sender, recipients, subject, date, the message body, and any attachments.
Safe HTML rendering
HTML emails are displayed inside a fully sandboxed <iframe> with scripts disabled, so tracking pixels and scripts in the message can't run. Switch between the HTML view, the plain-text part, and the raw source.
Attachments
Attachments are listed with name, type and size, and can be saved locally — decoded in your browser from the file you opened.
Privacy
The email is read locally and never uploaded. Got an Outlook .msg instead? Use the MSG Viewer. Also handy: decode a Base64 blob or inspect a JWT.