What is an ATR file?
An .ATR file is a data container used by multiple, unrelated software applications. Historically, it is most famous as an Atari Disk Image used by Atari 8-bit computers and modern emulators. However, the .ATR extension is also heavily used for physiological signal annotation files by PhysioNet WFDB, engineering simulation results by ANSYS, CAD attribute definitions by Nemetschek Allplan, and thermal imaging reports by FLIR Systems.
How to open ATR files?
Because an .ATR file can be many different things, you must first identify its actual format. You can use viewer.online/atr to analyze .ATR files. Our tool identifies the exact format and creator software, inspects the file structure, extracts readable text, and checks whether an online preview is available. For example, some FLIR thermal imaging reports use standard ZIP compression, which our platform can easily detect and explore.
Once you know the specific format, you can open it with the right software, such as the Altirra emulator for games, PhysioNet tools for medical data, or Allplan for CAD models.
File conversion and tools
If you need to convert an .ATR file, you can visit convert.guru. Depending on the exact type, you might convert a thermal report to .PDF or extract raw data from an Atari Disk Image to standard formats like .TXT or .BIN.
Summary
In summary, viewer.online/atr is extremely useful for identifying, inspecting, and understanding .ATR files without installing software or dealing with compatibility problems. If you are unsure what your .ATR file contains, use our analyzer to instantly reveal its format and origin.