Extract text from Baidu device ID files (CUID2)
To convert CUID2 Device ID files to another format, you need Baidu SDK or other System software.
To convert other file formats to the "Device Identifier File" file type, you need software like Baidu SDK or a similar tool.
A .cuid2 file is a proprietary system file generated by Baidu software and its mobile Software Development Kits (SDKs). Its primary use is storing a Client Unique Identifier (CUID) version 2. This file acts as a digital fingerprint, allowing applications to uniquely track and identify a mobile device or PC across different sessions and services.
You generally cannot open these files natively, but advanced users often attempt to inspect them using hex editors or basic text editors like Notepad. Because Baidu uses these files for tracking and analytics, users often want to open or convert them to see what personal data or hardware identifiers are being logged. The major disadvantage of the .cuid2 format is its proprietary, closed nature. The internal data is frequently obfuscated or encrypted to prevent tampering, meaning the file lacks transparency and raises privacy concerns for end-users.
If you need to analyze the data, the best target formats are plain text TXT or JSON. Converting to these formats allows you to read any plain-text strings embedded within the file, though you will lose the original binary structure required by the Baidu SDK.
This file format is exceptionally difficult to open or convert because it is not a standard document or media file. Only the original Baidu software algorithms can properly decrypt and interpret the complete data structure. If our analysis detects a supported underlying or embedded format, viewing or conversion may still be possible.
Convert.Guru analyzes your CUID2 file, detects the exact format, and lets you read the text inside.
Users also converted CRYPT14 files.
If you want to convert CUID2 file to , you can use Baidu SDK or similar software from the "Device Identification Storage" category. In the File menu, look for Save As… or Export….
To convert files to CUID2, try Baidu SDK or another comparable tool in the "Device Identification Storage" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our CUID2 converter.