I want to sign without an apple developer account

[bunitteshiteru]

I am on linux. i want to edit an ipa file (i want to change the bundle id), is there any way to sign it without an apple developer account? The image is something like altserver/altstore. The text may be wrong because I am using a translation. My apologies.

[emranovin]

It's possible. I've tested it right now to ensure.
However I should add I used macOS keychain to export the Certificate and Private Key and used Xcode to export the provision profile as well. If you can somehow obtain these files you should be ok on Linux as well as macOS. (the cert and private key remain intact in all your resign but the provision profile changes). I guess you can get a proper provision profile from some API like appstoreconnect. the free account does not have an app store connect portal but if xcode can generate one you should be able to generate as well.
The point is you should use -b option when using zsign because it turns out your app bundle should be the same as your provision profile.
(you've to be aware this method has limitations. you can just use this app for 7 days and you can install only 3 apps at the same time with a single account)