How to Fix Fix Thumbnail Previews Not Showing in File Explorer on Windows
File Explorer showing generic icons instead of image or video thumbnails? Thumbnail previews not loading or displaying blank? Fix thumbnail cache and preview issues on Windows 10 and 11.
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Main Troubleshooting Guide
How to Fix Computer Freezing and Hanging →Complete symptoms, causes, and step-by-step solutions
Symptoms
You might be experiencing this problem if you notice:
- •Images show generic file icons instead of thumbnail previews
- •Video files do not show frame previews in File Explorer
- •PDF thumbnails are blank or show generic PDF icon
- •Thumbnails load very slowly or only partially
- •Some folders show thumbnails but others do not
- •Thumbnail previews worked before but stopped after update
Common Causes
- ⚠Thumbnail cache is corrupted or full
- ⚠Folder Options set to "Always show icons, never thumbnails"
- ⚠Performance settings configured to disable thumbnails
- ⚠Thumbnail database file (thumbcache) is locked or corrupted
- ⚠Required codec or viewer for the file type is not installed
- ⚠File Explorer visual effects disabled for performance
Solutions
Solution 1: Enable Thumbnail Previews in Settings
- 1Open File Explorer → click the three dots menu → Options
- 2Go to the View tab
- 3Uncheck "Always show icons, never thumbnails"
- 4Click Apply → OK
- 5Also check: Win+R → sysdm.cpl → Advanced → Performance → Settings
- 6Under Visual Effects, ensure "Show thumbnails instead of icons" is checked
- 7Click Apply → OK
- 8Thumbnails should start appearing — give it a moment to generate them
Solution 2: Clear and Rebuild Thumbnail Cache
- 1Open Disk Cleanup: Win+R → cleanmgr
- 2Select C: drive → check "Thumbnails" → click OK → Delete Files
- 3Or manually clear the cache:
- 4Open Command Prompt as Administrator
- 5taskkill /f /im explorer.exe
- 6del /f /s /q /a %LocalAppData%\Microsoft\Windows\Explorer\thumbcache_*
- 7start explorer.exe
- 8Navigate to a folder with images — thumbnails will regenerate
Solution 3: Fix Specific File Type Thumbnails
- 1If only certain file types lack thumbnails:
- 2PDFs: Install Adobe Acrobat Reader or a PDF thumbnail handler
- 3Videos: Install K-Lite Codec Pack or LAV Filters for video thumbnails
- 4RAW photos: Install Microsoft Raw Image Extension from Microsoft Store
- 5PSD files: Install Adobe Photoshop or a PSD thumbnail previewer
- 6Check if the file type has a registered thumbnail provider:
- 7Some third-party viewers override Windows thumbnail handling
- 8Try setting the default app for the file type and restart Explorer
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