Browser-only .eml inspection

Free EML Viewer Online

A free EML viewer opens raw email files and turns the headers, MIME structure, attachments, and body preview into a readable diagnostic report. Files are parsed locally in your browser.

7
Headers
1
Attachments
845 B
Total size

Message source

sample-message.eml

Parsed summary

Key message metadata from the EML headers.

Subject
Weekly inbound email digest
From
"Launch Bot" <updates@example.com>
To
Support <support@mailparse.dev>
CC
Not found
Date
Wed, 18 Mar 2026 14:02:55 +0000
Message-ID
<digest-123@example.com>
Return-Path
<bounce@example.com>
Content type
multipart/mixed
Header warnings
  • Missing cc header.

MIME parts and preview

Plain text, HTML, and attachment parts detected from MIME boundaries.

Plain text
Yes
HTML
Yes
Body size
564 B

Body preview

Here is your weekly inbound email digest. Three new parsing events are ready for review.

Part 1: text/plain

89 B

Here is your weekly inbound email digest. Three new parsing events are ready for review.

Part 2: text/html

66 B

<p>Here is your <strong>weekly inbound email digest</strong>.</p>

Part 3: text/csv

36 B

id,status 1,ok 2,retried

Attachments

events.csv

text/csv · 36 B

attachment; filename="events.csv"

Headers

NameValue
From"Launch Bot" <updates@example.com>
ToSupport <support@mailparse.dev>
SubjectWeekly inbound email digest
DateWed, 18 Mar 2026 14:02:55 +0000
Message-ID<digest-123@example.com>
Return-Path<bounce@example.com>
Content-Typemultipart/mixed; boundary="mailparse-demo"

How to use the EML viewer

1

Upload or paste an EML file

Choose a .eml file from your computer or paste raw EML source into the editor.

2

Review the parsed summary

Check the sender, recipients, subject, content type, MIME part count, attachment count, and warnings.

3

Inspect headers and body preview

Use the header table, MIME part list, attachment summary, and preview text to debug the email file.

EML viewer FAQ

What is an EML file viewer?

An EML file viewer opens a raw email message file and shows the headers, sender, recipients, MIME parts, attachments, and message body in a readable format.

Do uploaded EML files leave my browser?

No. This viewer reads the file with browser JavaScript and parses it locally. The email content is not uploaded to MailParse or any third-party server.

Can this tool show email attachments?

Yes. It detects MIME parts marked as attachments and shows the filename, content type, disposition, and encoded part size when that metadata exists in the EML file.

What headers should an EML file include?

Most EML files include From, To, Subject, Date, Message-ID, Return-Path, and Content-Type headers. Missing headers can make debugging or import workflows harder.

Can I use this to debug inbound email parsing?

Yes. The viewer is useful for checking MIME boundaries, transfer encodings, text versus HTML parts, attachment metadata, and the exact headers an inbound email parser receives.