Files with crypt12 extension can be found as encrypted chat history databases from latest version of WhatsApp Messenger instant messaging client for Android.
Software that open crypt12 file
CRYPT12 file extension - WhatsApp Messenger message database
What is crypt12 file? How to open crypt12 files?
File type specification:
File extension crypt12 is mainly associated with the WhatsApp Messenger, an instant messaging service and client for various mobile platforms.
The crypt12 file stores encrypted and protected database (AES-256 encryption) with chat history similar to SQLite database format.
By default, the file is called: msgstore.db.crypt12 and is stored on phone SDcard/WhatsApp/Databases folder.
The key file used to decrypt .crypt12 file is stored in folder located on system partition:
/data/data/com.whatsapp/files/key
By default, the .crypt12 files are used by WhatsApp for Android.
Future versions of WhatsApp may use .crypt13, .crypt14 file extension.
The default software associated to open crypt12 file:
Company or developer:
andreas-mausch
A small tool for Microsoft Windows that allows users to display chats from the Android msgstore.db.crypt5 and .crypt7, .crypt8, .crypt9, .crypt10, .crypt11 and .crypt12 databases.
Company or developer:
WhatsApp Tools Dev
A web service for handling of WhatsApp databases. It is able to open backup files from .crypt legacy format and also .crypt5, .crypt6, .crypt7 and .crypt8, .crypt9, .crypt10, .crypt11, .crypt12 decryption / encryption.
Company or developer:
WhatsApp Inc.
Instant messenger available for Android and other smartphones as well as for desktop platforms. WhatsApp uses your 3G or WiFi (when available) to message with friends and family.
WhatsApp Tri-Crypt (Omni-Crypt) 
Company or developer:
EliteAndroidApps
An application for Google Android operating system, which is used to monitor and convert WhatsApp .crypt5, .crypt6, .crypt7 and .crypt8, .crypt9, .crypt10, .crypt11, .crypt12 backup files to .crypt legacy encryption and to .crypt5, .crypt6, .crypt7 and .crypt8, .crypt9, .crypt10, .crypt11, .crypt12 decryption / encryption. It is available in free and pro paid version.
List of software applications associated to the .crypt12 file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open crypt12 file, edit crypt12 file, convert crypt12 file, view crypt12 file, play crypt12 file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting crypt12 files.
Software that open crypt12 file - WhatsApp Messenger message database
Programs supporting the exension crypt12 on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about WhatsApp Tri-Crypt (Omni-Crypt) for open crypt12 file action.
