How to Get macOS-Style Quick Look & 300+ File Previews on Windows 11

If you work with creative assets, documents, or media files daily, you’ve likely run into one of Windows File Explorer's most frustrating limitations: blank icons.

Whether it's a Photoshop (.psd) file, a camera RAW image (.dng), an Apple photo (.heic), an e-book (.epub), or a 3D model/CAD file, Windows often refuses to show a thumbnail preview. Instead, you are left looking at a generic app icon, forcing you to open files one by one just to find the right one.

Enter SageThumbs-2k—a free, open-source tool designed to modernize Windows File Explorer by giving you instant visual previews, quick conversions, and handy tools right inside your desktop environment.

What is SageThumbs-2k?

SageThumbs-2k is an open-source revival and upgrade of the classic, widely popular SageThumbs utility from the Windows 7 era. Because the original application was abandoned years ago, open-source developers rebuilt and modernized it specifically for current Windows operating systems.

Instead of installing dozens of separate plugins or codec packs, SageThumbs-2k acts as a single, lightweight engine that supercharges your File Explorer.

• GitHub Repository: LunarWerxs/SageThumbs-2k

Key Features That Make SageThumbs-2k a Must-Have

1. Support for Over 300+ File Types

SageThumbs-2k adds thumbnail previews for over 300 file formats that Windows cannot display natively. Some popular formats include:

• Design & Graphics: Adobe Photoshop (.psd), Illustrator (.ai), Vector graphics, and CAD files.

• Photography: Camera RAW (.dng, .cr2, .nef), modern web formats (.avif, .webp), and iPhone photos (.heic).

• Documents & Media: PDF documents, CSV spreadsheets, Videos, E-books (.epub, .mobi), and digital comic books (.cbr, .cbz).

You can easily switch your folder view to Medium Icons, Large Icons, or Extra Large Icons and see rich, accurate visual previews instantly.

2. Mac-Style Quick Preview (Spacebar Key)

One of the best features included in SageThumbs-2k is Quick Preview. Inspired by macOS Quick Look, you can select almost any file—whether it's a heavy PSD file, a PDF document, or a complex CSV file—and press the Spacebar.

An instant preview window pops up without needing to launch heavy applications like Adobe Photoshop or Excel. Pressing Space again closes it instantly, saving you valuable time and PC memory.

3. Right-Click Quick Image Converter

Need to quickly convert an uncompressed image or proprietary format to JPEG or PNG? You don't need to open an image editor. SageThumbs-2k adds a flexible right-click context menu entry that lets you:

• Convert graphics between popular formats (PNG, JPG, BMP, WebP, GIF, etc.) in a single click.

• Send converted images directly to clipboard or copy them out quickly.

• Set any supported image directly as your desktop wallpaper.

4. Built-in Screenshot Tool

SageThumbs-2k goes beyond file viewing by incorporating useful desktop utilities, including a built-in screenshot capture tool. You can quickly snap regions of your screen and save them in your desired image format without needing third-party software.

5. Highly Customizable Settings App

Don't want thumbnails for every single format? Or do you want to set maximum thumbnail file sizes so your computer runs lightning fast?

SageThumbs-2k comes with a clean control panel where you can:

• Enable or disable thumbnail generation for specific file extensions.

• Adjust cache sizes and clear old thumbnail caches.

• Customize context menu shortcuts and dark/light mode preferences.

How to Install SageThumbs-2k

Getting started takes less than two minutes:

1. Download: Head over to the SageThumbs-2k Releases Page on GitHub and download the latest .exe installer.

2. Install: Run the installer. If Windows SmartScreen displays a "Windows protected your PC" message, don't panic! This happens because open-source utilities are not signed with expensive corporate certificates. Click More info and then Run anyway.

3. Restart Explorer: Once installation finishes, restart Windows Explorer (or reboot your PC) for the new thumbnail handlers to take effect.

4. Customize: Open the SageThumbs-2k Settings app from your Start Menu to tailor file extensions and context menu actions to your liking.

I’ve also made a video on this topic — you can watch it below.

https://youtu.be/DVgjCwxV-04

Check out my other posts, I post useful tutorials and tech tips, maybe you will find something useful 😉.