How do I open an MSG file without Outlook?

Use a free online MSG viewer such as JustToolkit. Drop your .msg file in the browser tool to view headers, body, and attachments without installing Microsoft Outlook.

An MSG file is a single email message saved by Microsoft Outlook. It uses the OLE Compound File format and stores MAPI properties (subject, body, recipients, attachments).

Is this MSG viewer private?

Yes. Parsing runs entirely in your browser with JavaScript. Your .msg file is not uploaded to our servers.

Can I download attachments from an MSG file?

Yes. Attachments stored in the MSG compound file are listed so you can download each file individually.

What is the difference between MSG, EML, and RPMSG?

MSG is Outlook’s native single-message format. EML is MIME/RFC822 used widely across clients. RPMSG is an encrypted rights-protected message that requires Microsoft authorization to decrypt.

Free & Private — No Upload, No Outlook Install

Open Outlook MSG Files
Online — Free, No Outlook Required

Drop any .msg file to view subject, from/to, body, and download attachments. Parsed with OLE/CFB + MAPI in your browser — nothing uploaded.

100% client-side — your email never leaves your device

Drop your .msg file here

Drag & drop an Outlook message, or click Browse

Supports: .msg · Max 50 MB · Free & unlimited

message.msg

0 KB

Opening your MSG file…

Validating OLE signature

Parsing CFB container

Reading MAPI properties

Extracting attachments

⚠️

Parse Error

Message

✓ Valid MSG

First 256 bytes. Valid MSG starts with OLE signature D0 CF 11 E0 A1 B1 1A E1

100%

Private — Zero Upload

Outlook Install

Always Free

All OS

Windows, Mac, Linux, Mobile

Simple Process

How to open an MSG file online

Three steps — no Microsoft Outlook required

Drop your .msg

Save the message from Outlook or an attachment, then drop it here. No account.

Parse OLE + MAPI

We read the compound file and property streams in JavaScript on your device.

Read & download

View headers and body, then download attachments with original filenames when available.

Why JustToolkit

MSG viewer built for privacy

No Outlook install

Perfect for Mac, Linux, Chromebook, and locked-down PCs that cannot run Outlook.

Client-side only

Email content often sensitive — we never upload your .msg to a server.

Attachments included

Download files embedded in the message when present in the MSG storage.

Part of the suite

Also try our winmail.dat and RPMSG tools for other Outlook formats.

FAQ

MSG file questions

Use this free online MSG viewer: drop the .msg file, then read the body and download attachments. No Outlook installation is required.

MSG is Outlook’s single-message format. It is an OLE compound file containing MAPI properties such as subject, recipients, body, and attachments.

Yes. Parsing runs in your browser. Your file is not uploaded to JustToolkit servers.

Yes. Open the Attachments tab and download each file. Some rare MSG layouts may store data in ways we do not yet fully decode.

MSG is Outlook-native. EML is standard MIME. RPMSG is encrypted rights-protected mail. See our comparison article.

Related tools

Winmail.dat Viewer RPMSG Viewer All tools

Open Outlook MSG Files Online — Free, No Outlook Required