Without resigning, the IPA will install but crash immediately due to code signature mismatch.
Converting a ZIP file to an IPA file is a frequent requirement for iOS developers, testers, and advanced users who want to sideload applications onto iPhones or iPads. While both file types are essentially compressed archives, simply changing the file extension from .zip to .ipa rarely works on its own.
If you have an unknown ZIP file, first unzip it and inspect its contents. If you see a Payload folder with an .app subfolder, renaming is all you need. If not, manual re-archiving via the Terminal zip command is the only reliable method.
Understanding how to manipulate these files is useful across several scenarios:
In File Explorer, click the View tab at the top and check the box for File name extensions .
The Payload folder was misspelled, lowercase ( payload ), or nested inside another subfolder when zipped.
You will see several export options. For distributing as an IPA, choose "Save for iOS Deployment" or directly "Create IPA".