Overview of Keep-Only-Specified-Extensions
A Windows freeware tool that keeps only files with specified extensions and deletes all others. Supports recursive folder processing, image size filtering, and optional Recycle Bin deletion.
- You can specify multiple file extensions to exclude from deletion (e.g. jpg, png, webp).
- Even excluded image extensions can be deleted if their display size is smaller than the specified threshold.
- Processes files in subfolders recursively.
- You can choose whether to move files to the Recycle Bin or delete them permanently.
Supported OS
Windows 11 / Windows 10 / Windows 7
Screenshot
Download (100% Free & Safe)
VirusTotal Scan Results:
KOSE.exe – VirusTotal Result (Score: 1/71)
Note on the Security Scan:
There is a single detection on the result, which is a false positive caused by a minor security engine’s heuristic analysis. It is very common for newly released or minor software to be misidentified as a threat.
Major antivirus vendors like Microsoft, Kaspersky, and Bitdefender have flagged this file as completely clean. This software is completely safe to use.
If this software has been helpful to you, I’m truly glad.
If you’d like to show your support, a small tip would be greatly appreciated!
Notes (Terms of Use)
- This software is provided as freeware. It may be used free of charge for personal or commercial purposes.
- Please read and agree to the terms of use before using this software.
- Bug reports and feature requests are welcome via email.
FAQ
I don’t understand the purpose of this tool. When would it be useful?
For example, it’s helpful when you’ve completely saved a web page that contains many photos (images) and you only want to keep the image files while deleting everything else.
When a web page is saved completely, it usually includes not only photo (image) files but also many other files such as HTML files, CSS files, JavaScript files, icon or button images, and thumbnail images.
This tool allows you to delete all those unnecessary files. Moreover, even if some of the files have the same extensions as the images you want to keep, you can automatically remove small-sized images such as icons, buttons, or thumbnails at the same time.
Change Log
ver 2.3.0 (January 1, 2026)
- Added the ability to cancel the deletion process while it is running
- Made minor UI adjustments
- Updated some log messages
- Changed the advertisement display method
ver 2.2.0 (October 26, 2025)
- Prevented the software from running multiple instances
ver 2.1.0 (September 25, 2025)
- Added a feature to delete small images even if their extensions are excluded
- Fixed so that settings cannot be changed during processing
- Modified some of the log display contents
ver 2.0.0 (August 16, 2025)
- Updated to prevent linked folders from being moved to the Recycle Bin together with HTML files
- Added logging functionality to display and save processing results
ver 1.0.0 (July 21, 2025)
- Initial release
