What is an RND file?
The .RND file extension has several different technical uses. The most common use is a sound level meter data file. Companies like Rion Co., Ltd and Cirrus Research use these files to store recorded noise data.
Another frequent use is a PGP Random Seed File. Security software like PGP (Pretty Good Privacy) and GnuPG generate these files. The .RND file contains random hash data. The cryptography software uses this random data to generate strong security keys.
Less commonly, an .RND file can be a rendered CAD drawing exported by MicroStation. These drawing files usually use an internal .TIFF image format. Finally, the extension is also used for gameplay demo recordings in the game Soldat.
How to open RND files?
Because .RND files have multiple possible formats, you need to identify the file before you can open it. Do not force the file open in a random text editor, as this might corrupt sensitive data.
We recommend using viewer.online/rnd to analyze .RND files safely in your browser. The tool will identify the exact format and creator software, inspect the file structure, extract readable text, and check whether an online preview is available.
Best practices and troubleshooting
If you use encryption software, never delete or manually edit a PGP Random Seed File. If you delete the file, your software might fail to generate secure keys until it builds a new pool of random hash data.
If you have a CAD rendering saved as an .RND file, you might be able to view it simply by renaming the extension to .TIFF.
If you want to share your files, you should convert them. We recommend using convert.guru to convert your file to sensible target formats. For example, CAD renderings convert easily to .PNG or .JPG, while noise data files can often be converted to .CSV for spreadsheet analysis.
Software and tools
- NoiseTools by Cirrus Research (for noise data files)
- GnuPG and PGP (for cryptographic seed files)
- MicroStation by Bentley Systems (for rendered CAD drawings)
- Soldat (for gameplay demos)
Summary
An .RND file can contain sound level data, cryptographic seeds, CAD images, or game recordings. viewer.online/rnd is extremely useful for identifying, inspecting, and understanding .RND files without installing software or dealing with compatibility problems.