We compared the leading free and paid email-file viewers — CoolUtils Mail Viewer, Encryptomatic MessageViewer Lite, FreeViewer, SysTools, MSGViewer Pro and Microsoft Outlook — on formats, attachments, whole-folder viewing, privacy and price. One tool lets you open both EML and MSG files without Outlook, completely free.
Of every viewer we tested, CoolUtils Mail Viewer is the one that opens both EML and MSG email files without Outlook, shows message headers and attachments, lets you browse a whole folder of messages at once — and does it all completely free for personal use, with your files staying entirely on your own computer.
It's the best choice for anyone who receives stray .eml or .msg files and just needs to read them fast, without installing Outlook or hitting a "buy Pro to continue" wall.
A side-by-side look at how the most popular free and paid email-file viewers stack up on the things that actually matter when you just need to open a message.
| Feature | Mail ViewerCoolUtils | MessageViewer LiteEncryptomatic | EML/MSG ViewerFreeViewer | MSG/EML ViewerSysTools | MSGViewer ProDetwiler | Outlook / Windows MailMicrosoft |
|---|---|---|---|---|---|---|
| Opens EML files | ✓ | ✓ | ✓ | ✓ | ✓ | Import |
| Opens MSG files | ✓ | ✓ | ✓ | ✓ | ✓ | Outlook only |
| Works without Outlook installed | ✓ | ✓ | ✓ | ✓ | ✓ | ✗ |
| Shows attachments | ✓ | ✓ | Limited | Limited | ✓ | ✓ |
| Shows full message headers | ✓ | ✓ | Limited | Limited | ✓ | Hidden |
| View a whole folder of messages | ✓ | Limited | Limited | Limited | ✓ | ✓ |
| Extra formats (EMLX, P7M, ICS, VCF, winmail.dat) | ✓ | Some | Some | Some | Some | ✗ |
| Export / save messages (PDF, etc.) | Reports (free) | Paid Pro | Paid upgrade | Paid tools | ✓ Paid | ✓ |
| Files stay on your PC (privacy) | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| No "buy Pro to continue" nagging | ✓ | ✗ Pushes Pro | ✗ Export gated | ✗ Export gated | ✗ Paid app | n/a |
| Modern, clean interface | ✓ | Dated | Basic | Basic | ✓ | ✓ |
| Windows 2000–11, Server & Citrix | ✓ | Modern only | Modern only | Modern only | Modern only | Modern only |
| Price | Free | Free / ~$70 Pro | Free view / ~$50+ export | Free view / ~$50+ tools | ~$70 | Requires Office |
✓ Full support
Partial / limited
✗ Not available
Competitor prices and feature tiers are approximate, differ between the free viewer and paid upgrades, and change over time. Many "free" viewers let you read messages but lock export/save behind a paid tool — verify on each vendor's site before you buy. CoolUtils Mail Viewer is free for personal use.
How CoolUtils Mail Viewer compares against each major alternative — an honest look at what each does well, and where Mail Viewer pulls ahead.
MessageViewer Lite is a genuinely capable free viewer that opens a wide range of email formats, and it's a long-standing name in this space. Credit where it's due — it handles more than just EML and MSG.
The catch is the "Lite" in the name: it constantly nudges you toward the paid Pro edition for anything beyond basic viewing, and its interface feels dated. CoolUtils Mail Viewer opens both EML and MSG with a cleaner, modern interface and no upsell pressure — it's free to view, full stop.
FreeViewer's EML/MSG viewer is free to open and read messages, which covers the basic "what does this file say?" job perfectly well.
Where it stops being free is the moment you want to keep anything — saving or exporting a message to PDF or another format is a paid upgrade. CoolUtils Mail Viewer shows attachments and headers as you view, and can generate reports without pushing you to a separate paid product.
SysTools offers a free viewer that reliably opens MSG and EML files, backed by a company with a big catalog of email-migration tools. For a quick read, it does the job.
But that big catalog is the point: the free viewer is the on-ramp, and any real export or conversion is locked behind SysTools' paid tools. CoolUtils Mail Viewer keeps viewing — attachments, headers, whole folders — free, so you're not funneled into a paid purchase to finish the task.
MSGViewer Pro is a robust, polished viewer that handles MSG and EML well and has a loyal following. If you want a paid, feature-rich desktop viewer, it's a legitimate option.
The key word is paid — there's a license to buy, and no free tier for casual folder viewing. If you only occasionally need to open an email file, CoolUtils Mail Viewer gives you the same core viewing — both formats, attachments, headers, whole folders — for free.
Outlook is the obvious default if you already have Microsoft Office — it opens MSG files natively and is the format's native home.
But it's a heavyweight: MSG support effectively requires the full Outlook app installed, EML handling is inconsistent across versions, and Windows Mail is being phased out. CoolUtils Mail Viewer is a small, standalone tool that opens both EML and MSG with no Office install, no account, and no cloud — just double-click and read.
Six reasons people pick it over every alternative in this comparison.
Free for personal use — no trial timer, no watermark, and no "buy Pro to keep reading" wall. Many competitors are free to open a file but lock viewing or export behind a paid tier. Mail Viewer just lets you read.
One tool for both of the formats stray email files actually arrive in — plus EMLX, P7M, ICS, VCF and winmail.dat. No hunting for a second app when the extension isn't the one you expected.
See who a message is from, its full headers, and every attachment as you view it — no export step just to find out what's inside a message.
A small standalone viewer that opens MSG files with no Microsoft Office install, no account and no add-ins. Ideal on a fresh PC or a machine that will never have Outlook.
Point it at a folder of saved messages and page through them one after another, instead of double-clicking files one at a time. Great for triaging an archive or exported mailbox.
100% offline desktop viewing — your emails are never uploaded to a server. Your data stays private and secure on your own device, which matters for confidential or work correspondence.
Weighted across format coverage, attachments & headers, folder viewing, no-Outlook convenience, privacy and price.
Quick answers to the questions people ask most when choosing an EML or MSG viewer.
For simply opening and reading .eml and .msg email files without Outlook, CoolUtils Mail Viewer is our top pick. It opens both formats, shows attachments and full headers, lets you browse a whole folder of messages, and is free for personal use — while keeping every file private on your own computer.
Yes. CoolUtils Mail Viewer is a small standalone app that opens both MSG and EML files with no Microsoft Office or Outlook installation required. Just download it, double-click your message file, and read it — no account and no add-ins needed.
Not always. Many free viewers — including some from FreeViewer, SysTools and Encryptomatic — let you read a message for free but lock saving or exporting (for example to PDF) behind a paid upgrade or a separate paid tool. CoolUtils Mail Viewer is free for personal use to view your messages, with attachments and headers included.
A desktop viewer like CoolUtils Mail Viewer processes everything locally — your messages are never uploaded to a third-party server, so confidential or work correspondence stays on your own machine. That's a real advantage over online email-file viewers that require an upload.
Yes. CoolUtils Mail Viewer can point at a folder of saved messages and let you page through them one after another, rather than opening each file individually — handy for going through an exported mailbox or an archive of .eml and .msg files.
See why CoolUtils Mail Viewer beats the alternatives. Download the free viewer and start reading your EML and MSG files instantly — no Outlook, no registration.
✓ Open both EML and MSG files
✓ No Outlook or Office required
✓ Attachments and full headers shown
✓ Browse a whole folder of messages
✓ EMLX, P7M, ICS, VCF & winmail.dat too
✓ Everything stays on your PC
Compatible with Windows 2000/2003/Vista/7/8/10/11/Citrix • ~2MB • Instant install