EmEditor Professional
Emurasoft, Inc. • Text Editor
Handling massive text files often overwhelms standard editors. EmEditor Professional is a fast, lightweight text and code editor specifically engineered to manage files up to 16 TB or over a trillion lines with minimal memory usage. This makes it an essential utility for developers, data analysts, and system administrators who frequently work with enormous log files, large CSV data sets, or complex codebases.
The application is optimized for speed and reliability. Using various CPU optimizations, including multithreading and SIMD technology, it significantly improves the performance of operations like opening, searching, and replacing content in very large documents. You can try the full feature set with a 7-day Professional trial, after which it automatically converts to the feature-limited EmEditor Free version.
Beyond raw performance, the editor offers powerful features like full Unicode support, scriptable macros, and a robust plug-in architecture. For users needing to analyze structured data, the dedicated CSV tools provide efficient sorting, filtering, and column manipulation capabilities.
In This Post
EmEditor Professional Quick Start
Optimizing Memory for Massive Files
- Navigate to Tools > Customize.
- Select the Advanced tab in the dialog box.
- Check the Enable Disk-Based checkbox to reduce system memory usage during editing.
- Set the Minimum File Size to Enable Disk-Based text box to a value like 100 MB (or 0 to always enable disk-based operations).
- Also check Read Unmodified Lines from the Original File to increase file opening speed.
Why: This configuration is vital for power users dealing with multi-gigabyte log files or data dumps. It forces EmEditor Professional to use file-based operations instead of loading the entire document into RAM, preventing system slowdowns and crashes.
Recent Changes in This Version
- Fixed a v26.0.0 regression that could crash the app when searching, replacing, or filtering very large non-UTF-8 files under certain conditions.
- Fixed an issue that could occur during edits involving surrogate-pair characters.
For complete changelog, visit the official release notes.
Product Specifications
| Software Name | EmEditor Professional |
|---|---|
| Version | 26.0.2 |
| License | Trial |
| OS Support | Windows 11, Windows 10, Windows 8.1, Windows Server 2012 R2 or later (64-bit) |
| Language | English, Japanese, Korean, German, Simplified Chinese, Traditional Chinese, French, Italian, Spanish, Dutch, Czech (multi-language) |
| Developer | Emurasoft, Inc. |
| Homepage | https://www.emeditor.com |
| Changelogurl | https://www.emeditor.com/blog/ |
| Last Updated | February 2026 |
Main Features
- Massive File Handling: The editor can open and manipulate files up to 16 TB in size, or 1,099 billion lines, utilizing minimal system memory through its Large File Controller.
- Scriptable Macros and Plug-ins: Automate complex or repetitive tasks using powerful, scriptable macros written in JavaScript or VBScript, a feature exclusive to the Professional edition. The plug-in architecture allows for extensive customization and feature expansion, including the Chat with AI plug-in.
- Advanced CSV Tools: Efficiently edit and analyze large CSV files with specialized functions like sorting by column, freezing header rows, converting formats, and joining multiple CSV documents.
- Optimized Search and Replace: Perform fast, multithreaded search and replace operations across very large files, supporting regular expressions and batch processing across multiple documents.
- Syntax Highlighting and Unicode: It supports syntax highlighting for over 50 languages, including HTML, C++, Java, and Python, alongside full Unicode support for multi-language text editing.
Installation Steps
Installation Steps
- Step 1: Click the download button above to get the Desktop Installer (MSI) for Windows.
- Step 2: Locate the downloaded MSI file and double-click it to begin the installation wizard.
- Step 3: Follow the on-screen prompts to accept the license agreement and choose your installation directory.
- Step 4: Once installation is complete, launch EmEditor Professional to begin your 7-day trial of the full feature set.
Compatibility: The latest 64-bit Desktop Installer is compatible with Windows 8.1 / Server 2012 R2 and later versions.
Common Issues & Fixes
- Issue: Installation fails with a permissions error → Solution: Right-click the MSI installer file and select Run as administrator to ensure proper system access.
FAQ
What is the difference between EmEditor Professional and EmEditor Free?
The Professional version includes advanced features like scriptable macros, the Large File Controller, full CSV tools, and plug-in support. The Free version is limited to basic editing features and is only licensed for personal use at home or school.
Is EmEditor Professional available for macOS or Linux?
No. EmEditor Professional is a text editor designed specifically for the Microsoft Windows environment.
How do I get the EmEditor Professional download?
You can get the EmEditor Professional download by visiting the official download page and selecting the Desktop Installer option. This installer provides a 7-day trial of the Professional edition.
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