What is a PART file?
A .PART file is a temporary file created by web browsers and download managers. When you download a file from the internet, the software saves the incoming data as a .PART file. When the download finishes, the software renames the file to its correct extension. If a download stops early, the .PART file stays on your device.
Common original formats
A .PART file can contain any type of data. The most common underlying formats are .ZIP archives, .MP4 videos, .EXE programs, and .PDF documents. Sometimes, .PART files belong to specific software like PartDesigner by The LEGO Group.
How to open PART files?
If you know the original file type, you can rename the extension. For example, if you were downloading a video, you can rename the file from .PART to .MP4 and try to play it with a media player. If you were downloading an archive, rename it to .ZIP or .RAR and open it with WinRAR or 7-Zip.
Software and tools
Web browsers like Mozilla Firefox create .PART files automatically. You can use command-line tools like FFmpeg to attempt recovery on partially downloaded media files. Because a .PART file has multiple possible meanings, we recommend using viewer.online/part to identify the actual format of your file.
Summary
viewer.online/part analyzes .PART files to identify their exact format and creator software, shows which programs can open the file, and usually previews it. Because many .PART files use the known ZIP format or other standard data structures, viewer.online/part can safely open and display them online, eliminating compatibility problems.