Opening a FIFF File

The FIFF file type is primarily associated with Elekta Neuromag.

FIFF	File extension: FIFF
	File type:	Magnetoencephalographic Data

What is a FIFF file

FIFF files mostly belong to Elekta Neuromag by Elekta AB. MNE software is used to compute cortically-constrained L2 minimum-norm current estimates and associated dynamic statistical parametric maps from MEG and EEG data, optionally constrained by fMRI.

How can I open a FIFF file?

You need a suitable software like Elekta Neuromag to open a FIFF file. You need a suitable software like Elekta Neuromag from Elekta AB to open a FIFF file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your FIFF file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a FIFF file directly in the browser:. Just drag the file onto this browser window and drop it.

Online FIFF Text Viewer

Choose your .fiff file to analyze

or drag and drop it here

Online File Viewer

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.FIFF File Won't Open? Here is What You Can Do

Because .FIFF files can originate from specialized scientific programs, they aren't universally openable by standard software.

Identify the Source: If received from a neuroimaging researcher or clinical neurologist, it is likely Magnetoencephalographic Data from an Elekta Neuromag system.
Check the Header: Open the file in a hex viewer to inspect the first few bytes.
- If you see readable text or XML, it may be a generic configuration file.
- If it appears entirely binary, it is likely complex neuroimaging data.
Use the Original Software: Opening the file usually requires the original program. Try specialized tools like Elekta Neuromag, MNE-Python, or EEGLAB, or ask the sender for guidance.
Use this Webpage: Drag and drop your .FIFF file onto this page to detect its exact format, extract metadata, and preview contents when possible.

Technical Data for FIFF File Extension

Related files:

fif, tiff

a fiff Magnetoencephalographic Data is a special file format by Elekta AB and should only be edited and saved with the appropriate software.

How to solve problems with FIFF files

Associate the FIFF file extension with the correct application.
Update your software that should actually open magnetoencephalographic data files. Because only the current version supports the latest FIFF file format. Search, therefore, e.g. on the Elekta AB manufacturer website after an available Elekta Neuromag update.
To make sure that your FIFF file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .FIFF file online - secure, fast, and no downloads needed.