Available in the Chrome Web Store

Open MSG Files Online
No Outlook required. Free and private.

Can't open an MSG file? Our free Chrome extension lets you open any .msg file instantly in your browser — without Microsoft Outlook, without uploading your files, and without any cost.

Open MSG Files - Install Free See how it works
No Outlook needed
No files uploaded
Batch open files
100% free

How to Open MSG Files — Step by Step

Open any .msg file in under a minute. No technical knowledge required.

1

Install MSG Viewer

Add the free MSG Viewer extension from the Chrome Web Store. One click to install — no account, no registration, no cost.

Installs in seconds
Minimal permissions
Works on Windows, Mac, Linux, Chrome OS
Install MSG Viewer from Chrome Web Store to open MSG files
Click Import Files to select and open your MSG files
2

Select Your MSG Files

Click the MSG Viewer icon in your toolbar, then "Import Files" to choose your .msg files. You can select one file or multiple files at once.

Select multiple MSG files at once
Also supports EML files
Files stay on your computer
3

View Your Email

Your MSG file opens instantly with the complete email: formatted body, all headers, embedded images, and downloadable attachments.

You can see

  • Full email body
  • From, To, CC, BCC
  • Embedded images

You can do

  • Download attachments
  • Browse multiple emails
  • View all metadata
View opened MSG file with full email formatting and attachments

Why Can't I Open MSG Files?

MSG files are locked to Microsoft's ecosystem. Here's why — and how to solve it.

MSG files (.msg) are Microsoft Outlook's proprietary email format. They use a binary structure called Compound File Binary Format (CFBF) — the same format used by older .doc and .xls files. This means they can only be opened natively by Microsoft Outlook.

If you receive an MSG file but don't have Outlook installed — whether you're on a Mac, Linux, Chromebook, or simply don't have an Office license — the file appears as an unknown format that your system can't open.

MSG Viewer solves this problem by parsing the MSG binary format directly in your browser using JavaScript. No server processing, no file conversion, no Outlook needed. Your MSG file opens exactly as the sender saw it.

Without MSG Viewer

Need Outlook ($99+/year), can't open on Mac/Linux, no way to view without software

Other Online Viewers

Upload your private emails to unknown servers, slow processing, file size limits

MSG Viewer

Free, instant, 100% local processing. Works on any OS. No file leaves your computer.

When You Need to Open MSG Files

Real situations where MSG Viewer saves the day

Received an MSG attachment

Someone forwarded you an email as an .msg file but you don't use Outlook? Open it instantly in Chrome. See the full email with all attachments, exactly as sent.

Legal email discovery

Reviewing email evidence for legal proceedings? Open MSG files privately without uploading to any third-party service. All metadata and headers preserved.

Switching from Outlook

Migrating away from Outlook but still have MSG archives? Batch open your saved emails to review and extract important attachments or information.

Using a Mac or Chromebook

MSG is a Windows/Outlook format, but you're on a Mac, Linux machine, or Chromebook? MSG Viewer works on any platform with Chrome.

IT troubleshooting

Need to inspect email headers, routing info, or MIME structure of an MSG file? Open it quickly without setting up a full Outlook profile.

Cloud storage files

MSG files stored in Notion, Google Drive, or Dropbox? Click to open them directly without downloading first. Works seamlessly with cloud services.

FAQ: Opening MSG Files

Everything you need to know about opening MSG files

How do I open an MSG file without Outlook?
Install the free MSG Viewer Chrome extension from the Chrome Web Store. Click the extension icon in your toolbar, select "Import Files", and choose your .msg file. It opens instantly with full email formatting, headers, and downloadable attachments. The entire process takes under a minute and works on any operating system.

What is an MSG file?
An MSG file is Microsoft Outlook's proprietary format for saving individual email messages. It contains the complete email including sender/recipient addresses, subject, body text (HTML and plain text), file attachments, embedded images, and metadata. MSG files use the Compound File Binary Format (CFBF), which is why they require special software to open.

Can I open MSG files on a Mac?
Yes. While MSG is a Windows/Outlook format, MSG Viewer works in Chrome on macOS. Install the extension, import your MSG file, and view it instantly. No need for Outlook for Mac or any conversion tools.

Are my files safe? Do they get uploaded?
Your files are completely safe. MSG Viewer processes everything locally in your browser using JavaScript. Nothing is uploaded to any server — ever. This is fundamentally different from web-based viewers that require file uploads. Your emails stay private at all times.

Can I download attachments from MSG files?
Yes. When you open an MSG file, all attachments are listed and can be downloaded individually with their original filenames. This works for all file types — PDFs, images, Word documents, spreadsheets, and more.

Can I also open EML files?
Yes. MSG Viewer supports both MSG and EML email formats. EML files from Thunderbird, Apple Mail, Windows Mail and other clients open just as easily. Use the same extension for all your email file viewing needs.

Does it work offline?
Yes. Once installed, MSG Viewer works entirely without an internet connection. Open MSG files anywhere, anytime — on a plane, in a restricted network, or in an air-gapped environment.

Open Your MSG Files Now

Free forever. No Outlook needed. No files uploaded. Works on any OS.

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Also opens EML files · View MSG files online