File Explorer shows file names but not preview images — here's why and what to do

File Explorer defaults to hiding thumbnail previews to save memory and speed up folder loading, especially on older computers or when you have thousands of files. Windows lets you turn thumbnails back on in seconds, but the setting lives in a place most people never look. If you've been clicking through folders without seeing what's inside each image file, you're working harder than you need to.

The fix depends on whether thumbnails are turned off system-wide or just in one folder. Most of the time it's a single setting in View options that you'll change once and forget about.

Key Takeaways

  • File Explorer hides thumbnails by default to speed up loading, especially on computers with limited memory.
  • Turn thumbnails on by opening any folder, clicking the View tab, and selecting a thumbnail size from the Layout options.
  • If thumbnails still don't appear after changing the setting, Windows may need to rebuild its thumbnail cache, which takes a few minutes.
  • Some file types (like certain raw photo formats) won't show previews unless you install the right codec or software.
  • If one folder shows thumbnails but another doesn't, that folder has its own view setting that overrides the default.

Turn on thumbnails through the View menu

Open File Explorer and navigate to any folder with image files. At the top of the window, click the View tab. On the right side of the ribbon, you'll see a Layout section with several icons showing different ways to display files — these are your view options.

Click on Large icons, Medium icons, or Thumbnails depending on how big you want the previews. Large icons and Thumbnails both show picture previews; the difference is that Thumbnails displays more files per screen because they're smaller. If you click List or Details, you'll see only file names and no previews at all.

The view you choose applies to that folder and any subfolder inside it unless you change it again. If you want thumbnails everywhere, you only need to set it once in your main Pictures folder or Documents folder, and subfolders will inherit the setting.

Rebuild the thumbnail cache if previews still don't appear

Sometimes Windows creates thumbnail images and stores them in a hidden cache folder. If that cache gets corrupted or out of date, File Explorer won't display previews even though the setting is on. Rebuilding the cache forces Windows to create fresh thumbnails.

Open File Explorer and click the View tab again. On the far right, click Options (or Change folder and search options depending on your Windows version). A window titled Folder Options will open. Click the View tab inside that window.

Scroll down until you see a checkbox labeled Always show icons, never thumbnails. If this box is checked, uncheck it. Below that, find Show thumbnail previews, not icons and make sure it is checked. Click explore, then OK.

Close File Explorer completely and reopen it. Windows will now rebuild thumbnails as you browse folders. The first time you open a folder with many images, it may take 10 to 30 seconds while Windows creates the previews. After that, they'll load normally.

Check whether a single folder has its own view setting

If thumbnails appear in some folders but not others, the folder without thumbnails probably has its own view setting that overrides your default. Right-click inside the folder that's not showing previews and look for an option called View or View options. Some versions of Windows show this as a submenu; others open a dialog.

Select the same thumbnail or large icon view you chose for other folders. This will sync that folder to match the rest. If you don't see a View option in the right-click menu, use the View tab at the top of File Explorer instead — it will change only that folder's setting.

Disable thumbnail preview for specific file types

Windows generates thumbnails for common formats like JPG, PNG, and BMP automatically. But some file types — particularly raw photo formats from professional cameras (CR2, NEF, ARW) and certain video codecs — won't show previews unless you install additional software.

If you're working with raw photos, you may need to install the camera manufacturer's codec pack or a third-party tool like FastStone Image Viewer or IrfanView, both of which add thumbnail support for formats Windows doesn't recognize natively. After installation, restart File Explorer and thumbnails should appear.

For video files, Windows 11 shows video thumbnails by default, but Windows 10 often doesn't. If you need video previews in Windows 10, the easiest route is to use a file manager like Directory Opus or Total Commander, which handle video thumbnails without extra setup.

Speed up File Explorer if thumbnails are slowing it down

On older computers or when browsing folders with thousands of files, generating thumbnails can make File Explorer sluggish. If you notice File Explorer freezing or taking a long time to open folders, you have two options: switch to a view that doesn't use thumbnails, or disable thumbnail generation for network drives.

If you're mostly working with local files on your computer, switch to List or Details view for folders you browse frequently. You'll lose the visual preview, but File Explorer will open when ready. For folders where you do need thumbnails, keep them in Large icons or Thumbnails view.

If you access files over a network (shared drives, NAS, cloud storage), thumbnails can be especially slow because Windows has to fetch each file across the network. Go back to Folder Options (View tab → Options), find Display file icon on thumbnails, and uncheck it. This tells Windows not to generate previews for network files, which speeds up browsing significantly.

Frequently Asked Questions

Why does Windows hide thumbnails by default?

Generating and storing thumbnail images uses memory and processing power. On computers with limited resources, showing thumbnails in every folder can slow down File Explorer noticeably. Hiding them by default keeps the system responsive, and you can turn them on for folders where you actually need the preview.

Can I make thumbnails bigger or smaller?

Yes. In the View tab, click the Layout dropdown and choose from Large icons, Medium icons, or Thumbnails. You can also use the scroll wheel while holding Ctrl to resize thumbnails on the fly in some Windows versions. The size you choose applies to that folder unless you change it again.

What if thumbnails show for photos but not for documents or videos?

Windows prioritizes image file previews and generates them automatically. Documents and videos depend on the software you have installed — Word can preview DOCX files, but only if Microsoft Office is on your computer. For video thumbnails in Windows 10, you may need to install a codec pack or use a third-party file manager.

Do thumbnails take up extra storage space on my hard drive?

Yes, but not much. Windows stores thumbnails in a hidden cache folder (usually a few hundred megabytes total). You can delete this cache folder to free up space, but Windows will recreate it the next time you view thumbnails. The trade-off is worth it for most people because the cache is small compared to your total storage.

Why are thumbnails loading slowly in a network folder?

Windows has to fetch each file across the network to create a preview, which is much slower than reading from your local hard drive. Disable thumbnail generation for network drives in Folder Options, or switch to List view when browsing shared folders. This will make navigation much faster.