MSG & EML Email Viewer - Outlook & Thunderbird Files

View Outlook MSG and EML email files with attachments and formatting. Perfect for business and email archiving. Free to use | No Sign In | 100% on device for privacy This extension allows you to view MSG and EML email files directly in Chrome without needing Microsoft Outlook or any other email client installed. It's designed for professionals who regularly work with email files and need a reliable, fast way to access their contents. When you encounter MSG or EML files - whether from email exports, legal discovery, backups, or shared by colleagues - this extension lets you open them instantly. Click on any MSG/EML file link on a website, or use the extension popup to browse and select files from your computer. The extension displays emails in a clean, professional interface that preserves the original formatting. MSG files: Native Microsoft Outlook format EML files: Standard email format used by Thunderbird, Apple Mail, Gmail exports, and most email clients Handles complex multipart emails with multiple content types Proper character encoding support including UTF-8 for international emails Smart Download Interception Email files you download are automatically opened in the viewer Works with downloads from any website including cloud storage services Can be turned on or off in extension settings Settings accessible from both the extension popup and the viewer sidebar Complete Email Display Full email headers: From, To, CC, Subject, Date HTML and rich text content rendered properly Plain text emails displayed with proper formatting Embedded images shown inline Preserves original email styling and layout Attachment Management View all attachments with file sizes and types Download individual attachments Image attachments show preview thumbnails Support for all common attachment types: documents, PDFs, images, archives Multi-Email Interface Open multiple email files simultaneously Sidebar navigation to switch between emails Remove emails from the viewer by hovering and clicking the X button Import multiple files at once through the file browser Download original email files after viewing with the download button Notion Integration Open MSG and EML files directly from Notion pages and databases Works with Notion's file hosting without additional configuration Seamless experience for teams using Notion for document management Smart File Detection Recognizes email files even without the .msg or .eml extension Uses file signature detection (magic bytes) to identify MSG files Analyzes content patterns to detect EML files Handles files from services that strip or change file extensions Privacy and Security All processing happens locally in your browser. Email files are never uploaded to any server or transmitted over the internet. Your sensitive business communications remain completely private. The extension works entirely offline once installed. Who Uses This Extension Business Professionals Many organizations archive important communications as MSG files. This extension lets you access these archives on any computer without needing Outlook installed. Perfect for reviewing old project communications, accessing archived customer emails, or working with email exports from different systems. Legal and Compliance Teams Email discovery often involves reviewing thousands of MSG or EML files. This extension provides a fast, efficient way to open and review email evidence. The complete preservation of headers, formatting, and attachments ensures you see emails exactly as they were sent. IT Administrators When migrating email systems or troubleshooting user issues, IT teams often need to inspect MSG and EML files. This extension provides immediate access to email contents without requiring a full email client setup. Consultants and Freelancers If clients send you email files for review or you're working with email exports from various systems, this extension eliminates compatibility issues. Works on any operating system where Chrome runs. Researchers and Archivists Email archives are valuable sources of information. This extension makes it easy to access historical email collections, whether for academic research, corporate history, or personal archives. MSG: Full support for Outlook message format including RTF bodies, HTML content, plain text, and all attachment types EML: Complete MIME parser supporting multipart messages, quoted-printable encoding, base64 encoding, and all standard email headers Binary file signature detection for files without proper extensions Performance Instant file parsing with no server round trips Handles large emails with many attachments efficiently Memory-optimized for processing multiple files Works with emails from any Outlook version or email client Browser Integration Automatically intercepts MSG and EML file downloads Direct opening of email files from web links Drag and drop support for easy file importing Works with cloud storage services including Notion, Dropbox links, and others Interface Design The extension uses a clean, professional interface inspired by modern productivity tools. The design focuses on readability and efficient information display. Email content is presented in a distraction-free reading pane with proper typography and spacing. Method 1: Automatic Download Interception When you download any MSG or EML file, the extension automatically opens it in a new tab. The email displays immediately with all content and attachments accessible. This behavior can be toggled on or off in the extension settings. Method 2: Direct Link Opening Click on any MSG or EML file link on a website. The extension intercepts the navigation and opens the file in the viewer. Works with direct file URLs from any domain. Method 3: Extension Popup Click the extension icon in your Chrome toolbar to open the file browser. Select one or more MSG/EML files from your computer. Files open in a new tab with a sidebar showing all loaded emails. Method 4: File System Integration Set Chrome as the default application for MSG and EML files in your operating system. Double-clicking files in your file manager opens them directly in Chrome using this extension. View all loaded emails in a list Click to switch between emails Hover over an email and click X to remove it from the viewer See attachment count indicators Toggle auto-open downloads setting Header Bar Download button to save the original email file to your computer Breadcrumb navigation showing current file Email Display Full email content with preserved formatting Expandable attachment section Copy email addresses with one click Why This Extension Unlike online email viewers that require uploading files to remote servers, this extension processes everything locally. Unlike desktop applications that require installation and updates, this runs entirely in your browser. Unlike simple viewers that only show basic content, this extension properly renders complex emails with full fidelity. The extension was built to solve real-world problems faced by professionals who work with email files daily. It focuses on reliability, privacy, and accurate rendering rather than unnecessary features. Auto-open downloads: Email files you download are automatically opened in the viewer Download button: Save the original email file after viewing Remove emails: Hover over emails in the sidebar and click X to remove them Notion support: Open email files directly from Notion pages and databases Smart detection: Recognizes email files by content even without proper file extensions Settings in viewer: Toggle auto-open downloads from within the viewer sidebar Complete MSG file support with RTF and HTML content Full EML parser with multipart MIME support Multi-email sidebar interface Attachment handling with download capabilities Character encoding fixes for international content Professional Notion-inspired interface design Planned Improvements Based on user feedback, future versions may include: Email search functionality within loaded files Export options for PDF or other formats Keyboard shortcuts for power users Enhanced attachment preview capabilities Email header analysis tools Support and Feedback For technical support, feature requests, or bug reports, visit msgfileviewer.com/feature-request. The extension is actively maintained by Cavess UG, a German software company specializing in productivity tools for professionals. This extension does not collect, store, or transmit any user data. All email processing happens entirely within your browser's sandbox environment. No analytics, no tracking, no external connections. Your email content never leaves your computer. The extension requests only the minimum permissions necessary to function: Storage: To save your preferences locally and temporarily hold email data during viewing Downloads: To intercept email file downloads and open them in the viewer File access: To read MSG/EML files from local file:// URLs About Cavess UG Cavess UG (haftungsbeschrankt) is a software development company based in Germany, focused on creating productivity tools that respect user privacy. We believe professional software should be powerful without being complicated, and private without compromising functionality. Chrome version 88 or higher Works on Windows, macOS, Linux, and ChromeOS No additional software required Approximately 2MB download size Works offline after installation For Enterprise Users This extension can be deployed across organizations using Chrome's enterprise policy system. IT administrators can pre-configure settings and deploy the extension to all users without individual installation. Contact support for enterprise deployment guides. The extension complies with corporate security policies by: MSG & EML Email Viewer provides a professional solution for anyone who needs to work with email files. Whether you're reviewing legal documents, accessing archived communications, or simply trying to open an email file someone sent you, this extension makes it simple and secure. Install it once and have permanent access to any MSG or EML file, anywhere you have Chrome installed. No subscriptions, no accounts, no uploads - just a reliable tool that does exactly what it promises.