JB Thumbnail Preloader Thumbnail Preloader
JB Thumbnail Preloader is a Windows app. You can buy your license right here on your phone; for the download itself, open this page on your Windows PC.

Transparency

Data processing in the app

The app works with your files. That deserves one place where it is written down plainly what happens and what does not.

Last updated: July 2026

What stays local

The Software reads your files in order to generate preview images. This reading and generating happens entirely on your device. No image content, file names, folder paths or file listings are transmitted to the Provider or to third parties.

Type of dataStoredPurpose
Generated previewslocally on the deviceDisplay in Windows Explorer
List of preloaded folderslocally on the deviceKnowing which areas are kept warm
Settingslocally on the deviceSpeed, depth, display options
Processing statisticslocally on the deviceShowing throughput and progress
License key and device identifierlocally, and with the ProviderChecking that a license is valid and tied to one device

Which connections the app makes

  • Activation and license check. Transmitted are the license key and an identifier derived from device properties. That identifier serves only to tie an activation to one device.
  • Update check. The app asks whether a newer version exists. What is transmitted is the installed version.
  • Nothing else. Outside those two cases the Software works offline.

What the app does not do

  • No transmission of image content, previews or thumbnails.
  • No transmission of file names, folder names or directory structures.
  • No advertising tracking, no passing of data on for advertising purposes.
  • No modification, moving or deletion of your original files. Access is read-only.

Deleting

You can discard previews and settings in the app at any time. Uninstalling removes them as well, see Uninstall and clean up. To delete data held by the Provider in connection with your license, please contact us through the contact form.

Payment data

Payment data is processed exclusively by the payment provider Paddle. The Provider never receives complete card or bank details. Details on processing on this website are set out in the Privacy Policy.