All about DIAG Files

The DIAG file type is primarily associated with Apple Console.

DIAG	File extension: DIAG
	File type:	log file

What is a DIAG file?

DIAG files mostly belong to Apple Console. DIAG files record diagnostic data on macOS. They capture system logs and error reports used for troubleshooting issues.
In many cases the file is a plain text report, but some use the JSON format to organize the data.
They are created by built-in utilities such as Apple’s Console and Feedback Assistant.
Use cases include:

macOS Diagnostic Report: a file that logs system activity and errors.

Apple Diagnostic File: a JSON formatted log also known as a macOS Diagnostic Log File, managed by Apple Feedback Assistant.

FilExt.com note: For more details, visit the Apple Feedback Assistant webpage.

How do you open DIAG files?

You need a suitable software like Apple Console to open a DIAG 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 DIAG file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a DIAG file directly in the browser:. Just drag the file onto this browser window and drop it.

Online DIAG Text Viewer

Choose your .diag file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert DIAG files:

Apple Console
See the previous paragraphs to learn more about the main application. DIAG files are often referred to as Apple Console systems because this type of file is primarily created or used by this software.
macOS
A *.DIAG file is a diagnostic report generated by macOS, containing logs and system information often used for troubleshooting. These files can be in various formats, including plain text and JSON, and may be submitted to Apple through the Feedback Assistant. They provide valuable insights into the system's state at the time of an issue. This file format is classified as System File.

Technical Data for DIAG File Extension

File classification:

System

a diag log file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with DIAG files

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