The "Portable" designation is a crucial differentiator for this tool.

This is unique. Windows keeps old versions of drivers "just in case." Over time, this can eat up 5–10 GB. Slimmer identifies outdated driver versions that are safe to remove.

The portable version does not auto-update. You must manually download the latest portable version to get updated bloatware lists or support for new Windows 11 features. Keep a bookmark for the source site.

. With a few clicks, the software scanned the hidden corners of the C: drive. It found gigabytes of old Windows update files—remnants of versions long past that the system no longer needed but refused to delete.