File types
What is this file, and can it go?
The leftovers that collect in Downloads, what made them, and whether you still need them.
Safe to trash
What is a .dmg file, and can you delete it?
A .dmg is a disk image, the package most Mac apps come in; once the app is copied to Applications, you can eject it and trash the .dmg.
ReadSafe to trash
What is a .pkg file on a Mac, and can you delete it?
A .pkg is an installer package that macOS’s Installer app runs; once the installation has finished, the .pkg file can go to the Trash.
ReadCheck first
What is a .crdownload file on a Mac?
A .crdownload file is a download Google Chrome is still working on; when it finishes, Chrome renames it to the real file name.
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What is a .download file on a Mac?
A .download file is a download Safari hasn’t finished; it holds the partial data so the download can be resumed.
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What is a .part file on a Mac?
A .part file holds a download that Firefox or another app is still writing; it disappears when the download completes.
ReadSafe to trash
What is an .ics file, and can you delete it after adding the event?
An .ics file is a calendar event in a standard format; once you’ve added it to Calendar, the file can go to the Trash and the event stays.
ReadUsually safe to trash
Can you delete a .zip file after unzipping it on a Mac?
Usually yes: once the unzipped folder sits next to it with everything you need, the .zip is a spare copy and can go to the Trash.
ReadCheck first
What is a .heic file on a Mac, and how do you convert it?
HEIC is the photo format iPhones save in; a Mac opens it in Preview or Photos and can export it as JPEG.
ReadUsually safe to trash
Why do my downloads end in (1), and can I delete them?
A "(1)" means you downloaded a file that was already there; if it matches the original, the numbered copy can go to the Trash.
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