Mbox Email Analyzer
Explore your email archives privately
Email Analysis
Visualize patterns in your email archives
Attachment Management
Find and access all email attachments
100% Private
Your data never leaves your device
Click to upload or drag and drop
.mbox file
Upload your Standard .mbox file (i.e. Google Takeout Gmail) to analyze your emails locally in your browser.
Your data never leaves your computer - all processing happens locally.
Privacy & Security
100% Client-Side Processing
This application runs entirely in your browser. Your email data is never sent to any server or third party. All processing, analysis, and storage happens locally on your device.
Local Data Storage
Your email data is stored securely in your browser's IndexedDB. This data persists only in your browser and is accessible only to you. Closing the tab or browser will not lose your data, but clearing browser data will.
No External Dependencies
This application uses no external APIs or services. Everything runs within your browser, with no data transmitted to any external source for processing or storage.
Features
Comprehensive Analytics
Discover your email patterns with visual analytics showing volume trends, top senders, conversation lengths, and more.
Conversation Threading
View complete email conversations in threads, making it easy to follow discussions and find important exchanges.
Attachment Management
Find and download attachments from your emails with ease, including file type analysis and size statistics.
Advanced Search
Quickly find specific emails with powerful search capabilities across sender, subject, content, and date ranges.
Complete Privacy
Your data never leaves your browser. All processing happens locally, ensuring your emails remain private.
Label & Tag Support
View and filter emails by labels or tags, with enhanced support for Gmail's labeling system and categories.
How It Works
Export Your Emails
Export your emails as an mbox file from your email service. Most email providers including Gmail, Yahoo, and Outlook support exporting in mbox format.
Gmail Instructions:
- Go to Google Takeout
- Deselect all, then select only "Mail"
- Click "Next step" and choose your delivery method
- Once processed, download the ZIP file and extract the mbox file
Upload Your File
Upload your mbox file to this application. The file stays on your computer and is processed entirely in your browser — nothing is transmitted to any server.
Processing
The application parses your emails, extracting metadata, content, and attachments. It builds conversation threads, identifies labels/tags, and generates analytics.
Explore & Analyze
View comprehensive statistics about your email history, search for specific messages, download attachments, and explore your communication patterns.
Frequently Asked Questions
What is an mbox file?
An mbox file is a standard mailbox format used to store collections of email messages. It's a widely supported format that many email services allow you to export, including Gmail, Yahoo Mail, and others.
Can I use this with non-Gmail emails?
Yes! While this tool has enhanced support for Gmail-specific features like labels, it works with any standard mbox file from any email provider. The core email viewing, searching, and analysis features work with all mbox files.
Is there a limit to the file size I can process?
The tool is designed to handle large mbox files by processing them in chunks. However, browser limitations may impact performance with extremely large files (several GB). For the best experience with very large archives, consider breaking them into smaller mbox files by date range if your email provider supports this.
Will my data persist if I close the browser?
Yes, your processed email data is stored in your browser's IndexedDB storage, which persists even when you close the tab or browser. However, if you clear your browser data or use private/incognito browsing, the data will be lost and you'll need to upload and process your mbox file again.
Can I export my analysis results?
Yes, you can export statistics, search results, and email content to CSV or JSON formats for further analysis in other tools. You can also download individual attachments or save email content.
How do I clear my data from this tool?
You can clear all data by clicking the "Clear Data" button in the settings menu. Additionally, clearing your browser's data for this site will remove all stored information. Remember, your data is only stored locally in your browser.
Technical Information
About the mbox Format
The mbox format is one of the oldest and most widely supported email storage formats. It stores emails in a single text file where each message begins with a "From " line (note the space after "From"). The format is supported by most email clients and services.
This analyzer supports the standard mbox format along with common variations such as mboxo, mboxrd, and mboxcl. It automatically detects the format and processes it accordingly.
Browser Requirements
This application requires a modern browser with support for:
- IndexedDB (for local data storage)
- File API (for file reading)
- Web Workers (for background processing)
- ES6+ JavaScript
Compatible browsers include recent versions of Chrome, Firefox, Safari, and Edge.
Performance Considerations
Processing large mbox files can be memory-intensive. The application uses:
- Chunked file processing to reduce memory usage
- IndexedDB for efficient data storage and retrieval
- Background processing where available
- Optimized parsing algorithms for email content
For multi-gigabyte mbox files, you may experience better performance on devices with more RAM and faster processors.