KSign guide: import your certificate and install IPAs on iPhone
How to use KSign with a P12 signing certificate: one-tap install from lemoncert, manual certificate import, signing an IPA and fixing common KSign errors.
Signing appsUpdated Sep 17, 2026·4 min read
KSign is a lightweight on-device signer with a very simple interface — import a certificate, import an IPA, tap Install. It's a good choice if Feather feels like too much.
Install KSign with your certificate pre-loaded
- Get a certificate for your device.
- In your lemoncert account, open Signed apps → KSign → Install.
- Accept the *Install “KSign”?* prompt, then trust the developer in Settings → General → VPN & Device Management.
- Open KSign — your certificate is already in Settings → Certificates.
Importing a certificate manually
Settings → Certificates → Import, choose cert.p12 and cert.mobileprovision, enter the password from password.txt, then select it as the active certificate.
Signing an IPA
- Apps → Import (Files or URL).
- Tap the app → Sign → Install.
- Confirm the iOS prompt. Wait for the icon to finish loading.
Common KSign problems
- *Certificate invalid* right after import — wrong password, or
.p12and.mobileprovisionfrom different certificates. Re-download the bundle from your order page. - *Install fails at 100 %* — network verification blocked (VPN / DNS). Disable it during install.
- *App crashes on launch* — certificate revoked. See what to do.
Frequently asked
KSign or Feather?
Both do the job. Feather has more options (tweak injection, sources); KSign is simpler. lemoncert can install either one pre-loaded with your certificate.