Large File Support

EmEditor is optimized for handling large files, the kind of files that other editors just can’t handle. Files up to 248GB can be opened in full using only a little bit of memory. For files even larger than that, EmEditor uses the Large File Controller to moderate how the program handles huge files.

Edit Files Larger than 248GB

EmEditor opens up to 248 GB or 2.1 billion lines – whichever is reached first, when opening a file – with only a little memory.

Large File Controller

The Large File Controller enables you to view and edit files larger than 248GB by opening up one section of the file at a time. You can control which and how many lines are displayed, and view how much memory EmEditor is using.

Split/Combine Files

Easily manipulate your large files with the Split and Combine Files features, which allow you to cut up and put together files for quick and easy editing.


Sort operations are optimized for large files—EmEditor v13 runs a Sort command for a 1,750,000 line file in under 8 seconds.

Multithreaded design

The key to EmEditor’s large file capabilities is its single-process, multithreaded design, which allows EmEditor to execute powerful functionality without compromising speed or taking up too much memory.

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