Online MSG Viewer
Open your MSG files instantly, right here in your browser.
Fully client-side: Your files are parsed in your browser and are not uploaded to our servers.
Drop your .msg file here
or click to browse from your computer
How to Open MSG Files Online
Opening an Outlook .msg file on your computer usually requires Microsoft Outlook or an expensive third-party application. With our free Online MSG Viewer, you can open, read, and explore your email messages instantly right from your web browser — no software installation required, and no account needed.
Which browsers are supported?
The online viewer works in any modern browser that supports the File API — including Chrome, Edge, Firefox, and Safari. It works on Windows, Mac, Linux, and ChromeOS. No plugins or extensions required.
Is it private?
Yes. When you drag and drop a file into the viewer, it is processed entirely using JavaScript running inside your browser tab. Your email content and attachments are never uploaded to any server — everything stays on your device.
What does the online viewer show?
The viewer displays the full email — sender, recipients, subject line, date, formatted HTML body, and a list of all attachments including file names and sizes. It renders rich HTML emails the same way they were intended to be read.
What about attachments?
The online viewer lists all attachment names, sizes, and types. To save individual attachments directly to your device, use the native OpenMSG Windows app, which also handles larger files faster and works offline.
What is an MSG file?
An MSG file is a proprietary binary format developed by Microsoft for Outlook. It stores a single email message — including sender, recipients, subject, timestamps, HTML body, embedded images, and any attached files — all in one container. Because it uses Microsoft's Compound File Binary structure, it cannot be opened by standard text editors or most email clients without specialised parsing.
Online viewer vs. the Windows app — what's the difference?
The online viewer is the fastest way to open a single MSG file from any device or operating system with no installation. The OpenMSG Windows app is built for regular use — it opens files in milliseconds, supports attachment saving, integrates with Windows file associations, and works fully offline. Both process MSG files locally without uploading your data.