What is a CRX file?
A .CRX file is primarily a Chromium Extension package. Google uses this format to distribute add-ons for the Google Chrome web browser. A .CRX file contains the software code required to add specific features to the browser, including HTML, CSS, JavaScript, and image files. Under the hood, this format is a compressed archive similar to a .ZIP file, but it includes a custom header with a public key and a cryptographic signature.
A secondary, less common use for the .CRX file extension is the Compact RINEX observation data file. Scientists and surveyors use this format to store Global Navigation Satellite System (GNSS) data. These files are typically compressed using the specialized command-line tool `RNX2CRX`.
How to open CRX files?
To use a Chromium Extension, you normally install it in a compatible browser like Google Chrome, Brave, or Microsoft Edge. You can do this by opening the browser's extension management page and dragging the .CRX file directly into the window.
If you want to view the source code of the extension instead of installing it, you can rename the file extension from .CRX to .ZIP. Once renamed, you can extract the contents using standard archive software like 7-Zip or WinRAR.
Best practices and tools
Because a .CRX file can represent multiple formats, you must first verify its contents. Never install unknown browser extensions, as they can execute harmful code and access your private browsing data. Always inspect the source code if you download a .CRX file from an unofficial source. If you need to transform the archive for easier access, we recommend using convert.guru to securely convert your .CRX file into a standard .ZIP format.
Summary
viewer.online/crx can analyze .CRX files to identify the exact format and creator software, inspect the file structure, extract readable text, and check whether an online preview is available. Because a file with this extension might be a browser add-on or a scientific data archive, viewer.online/crx is useful for identifying, inspecting, and understanding .CRX files without installing software or dealing with compatibility problems.