The Files app, added in iOS 11, supports zip files. You can open them, see their contents, and extract files without any third-party apps. You’ll still need an app from the App Store if you want to create zip files.
When you download a zip file in Safari, your iPhone or iPad will offer to open it in the Files app. Tap “Open in Files” to do so. You can also save zip files to the Files app from other applications.
You’ll be prompted to choose a location for the zip file. You’re saving a copy of the zip file to this location.
Select a location—like your iCloud Drive or a folder on your iPhone—and tap “Add.”
Tap the zip file in your Files app to open it.
Tap “Preview Content” to see the contents of the zip file.
You can view the contents of the zip file here. If the zip file contains multiple files, swipe left and right to switch between them.
To extract a file from the zip archive, tap the Share button and select “Save to Files” to save it to your files app, or tap an app to immediately send it to that app.
If you want more features—for example, if you want to actually create zip files on your iPhone or add files to an existing zip file—you’ll need a third-party app for working with zip files.