EEG data file
File type: Various data file
An .eeg file contains medical electroencephalography (EEG) data, such as recorded electrical activity from the brain.
It is a data file associated with EEG recording and analysis equipment and may also contain information used to display EEG graphs.
File type category:
Various data file
Date updated: October 11, 2026
The eeg file extension is used for stored data from electroencephalography devices. The files may contain recorded EEG signals and related information needed to review the recording as graphs or other reports.
Examples include files produced by SleepScan and Ceegraph from Bio-logic Systems Corp. These files are generally intended to be opened as part of the software and equipment workflow that created them.
Because EEG files can use software-specific data structures, compatibility depends on the originating Bio-logic software. They are not normally intended for general-purpose document or image applications.
Open an .eeg file with the Bio-logic software that created it, such as SleepScan or Ceegraph, where available. These applications are designed to display and analyze the associated EEG recording.
If the file does not open, it may require the original recording system or a compatible version of the vendor's software. A general-purpose text, spreadsheet, or image viewer is unlikely to interpret it correctly.
There is no known general-purpose converter for this type of .eeg file. EEG data should normally be exported from the Bio-logic recording or analysis software, if that software provides an export function.
Available export formats and the amount of information retained depend on the application and the recording.
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