Opening CACERTS Files

The CACERTS file type is primarily associated with Java Keytool.

CACERTS	File extension: CACERTS
	File type:	keystore file

What is a CACERTS file?

CACERTS files mostly belong to Java Keytool. A CACERTS file holds a set of trusted certificate authority (CA) certificates used by Java applications. It is a keystore that is managed with the Java Keytool utility and is integral to the Java Runtime Environment for validating SSL/TLS connections.

Purpose: Stores CA certificates that Java uses to verify secure communications.
Usage: Managed via command-line tools like keytool (e.g., keytool -list -keystore cacerts).
Format: A binary keystore file that is password protected (default password is often 'changeit').
Location: Typically located in the Java installation directory (commonly under JAVA_HOME/lib/security/).

More details can be found at the Oracle Java Downloads page.
FilExt.com tip: This file is essential for ensuring that Java applications can authenticate and trust external secure connections.

How to open CACERTS files

You need a suitable software like Java Keytool to open a CACERTS file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your CACERTS file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a CACERTS file directly in the browser:. Just drag the file onto this browser window and drop it.

Online CACERTS Text Viewer

Choose your .cacerts file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert CACERTS files:

Java Keytool
See the previous paragraphs to learn more about the main application. CACERTS files are often referred to as Java Keytool settings because this type of file is primarily created or used by this software.
Java Runtime Environment (JRE) and Java Development Kit (JDK)
*.CACERTS files are primarily used as the Java Certificate Authority (CA) Certificate store. They contain a collection of trusted CA certificates in a Java Keystore format. These certificates are used by Java applications to verify the authenticity and trustworthiness of other certificates presented by servers during secure communication, such as those using HTTPS. The *.CACERTS file ensures that Java applications can establish secure connections by validating the digital certificates presented by servers against a trusted list of CAs. This file format is classified as Security.

CACERTS file format details:

A file format defines how the data in the file is structured. Each file format has a unique extension and almost always a unique signature. For example, Microsoft Word documents have the extension .docx and the signature (usually the first 3 characters in this file) PK. If the file extension or signature does not match the file format, errors will occur when opening or editing the file. Exact knowledge of the format is therefore important in order to solve problems occurring in files. Our analysis of the CACERTS files produces the following result:

The CACERTS file extension is rather rarely used and mainly uses a defined CACERTS format. The file formats most commonly found in CACERTS files are:

85% of all CACERTS files start with the bytes þíþí, which are crucial for this file format. The content consists of illegible binary data, which can only be read and interpreted by the associated programs. The file size is in the range of 82 KB to 150 KB. This file type is based on cutting-edge technology. Several words can almost always be found in the files, e.g. DigiCert. A usual file name is cacerts..

All other CACERTS files (15%) have different formats. If you want to find out what your CACERTS file contains, drag and drop it onto this page.

Technical Data for CACERTS File Extension

File classification:

Settings

Related files:

jks, pem, der, crt, cer, p12, pfx, keystore, jceks, bks, certs, cert, keystore, file, ser, class

a cacerts keystore file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with CACERTS files

Associate the CACERTS file extension with the correct application.
Update your software that should actually open keystore files. Because only the current version supports the latest CACERTS file format. Search, therefore, e.g. on the manufacturer website after an available Java Keytool update.
To make sure that your CACERTS file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .CACERTS file online - secure, fast, and no downloads needed.