– Sign apk/jar/zip files on your cell phones or tablets. – Verify apk/jar/zip files to see if they are signed/modified. – Manage keystores (import/export). Pro features: – Making your own keystore files. – Themes. Notes – The app is not available in some countries. I am sorry for the inconvenience. – Play Store *unprofessionally* limits replies to 350 characters. Sometimes I can’t say thanks after a long reply.