What is an HSH file?
An .HSH file is typically a system or data file that stores hash values, cache data, or search indexes. Because different applications use the .HSH extension, it can have multiple meanings. It is often a Windows Catalog Search Index File created by Microsoft. It can also be a drive image hash file used by backup software like O&O DiskImage and R-Drive Image, a graphic thumbnail cache for FastStone Image Viewer and The Print Shop, or a chat hash file for WhatsApp Messenger.
How to open HSH files?
You usually do not open .HSH files directly. Applications read them in the background. If you need to inspect the data, you must know the exact software that created the file. A backup hash requires the original backup software. A thumbnail cache requires an image viewer. If you do not know the source, you can use a hex editor or a command-line tool to inspect the file header.
Best practices and troubleshooting
Do not delete .HSH files if you do not know their source. They help programs run faster and verify data integrity. If a program creates too many .HSH files, check the software settings. For example, you can clear the thumbnail cache in FastStone Image Viewer to free disk space safely.
Software and tools
Different tools create and manage .HSH files. Common software includes O&O DiskImage, R-Drive Image, FastStone Image Viewer, and Microsoft Windows.
Summary
viewer.online/hsh can analyze .HSH 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 an .HSH file can be one of many formats, viewer.online/hsh helps you identify the actual format of your file. This makes viewer.online/hsh useful for identifying, inspecting, and understanding .HSH files without installing software or dealing with compatibility problems.