How to Fix File Thumbnails Not Showing — Icons Instead of Previews on Windows
Image and video thumbnails showing as generic icons, thumbnail previews broken, or File Explorer not generating previews? Fix thumbnail cache issues.
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Main Troubleshooting Guide
How to Fix Slow Computer →Complete symptoms, causes, and step-by-step solutions
Symptoms
You might be experiencing this problem if you notice:
- •Images show generic icon instead of thumbnail preview
- •Videos show white/generic icon instead of frame preview
- •Thumbnails work for some files but not others
- •Thumbnails briefly appear then revert to icons
- •PDF thumbnails not showing in File Explorer
- •Thumbnail loading very slowly in large folders
Common Causes
- ⚠Thumbnail cache corrupted
- ⚠Folder view set to list/details instead of thumbnail view
- ⚠"Always show icons, never thumbnails" option enabled
- ⚠Disk Cleanup keeps clearing thumbnail cache
- ⚠File type doesn't have a thumbnail handler registered
- ⚠Thumbnail cache database too large or fragmented
Solutions
Solution 1: Enable Thumbnail Previews
- 1File Explorer → View → check that you're in a view that shows thumbnails
- 2Icons, Tiles, or Content view — not Details or List
- 3File Explorer → Options (or Tools → Folder options) → View tab
- 4UNCHECK "Always show icons, never thumbnails"
- 5Apply to all folders: "Apply to Folders" button
- 6Also check: Settings → System → About → Advanced system settings → Performance Settings
- 7Ensure "Show thumbnails instead of icons" is checked
Solution 2: Clear and Rebuild Thumbnail Cache
- 1Disk Cleanup (cleanmgr) → check "Thumbnails" → Clean up
- 2Or CMD:
- 3taskkill /f /im explorer.exe
- 4del /f /s /q /a %LocalAppData%\Microsoft\Windows\Explorer\thumbcache_*
- 5start explorer.exe
- 6Navigate to a folder with images — thumbnails will regenerate
- 7This process can take a few minutes for large libraries
Solution 3: Fix Specific File Type Thumbnails
- 1PDFs: need a PDF reader that registers a thumbnail handler (Adobe Reader, SumatraPDF)
- 2Raw photos: install Microsoft Raw Image Extension from Store (free)
- 3HEIC images: install HEIF Image Extensions from Store
- 4Videos: ensure proper codecs installed — K-Lite Codec Pack or VLC
- 5PSD files: install Photoshop or a PSD thumbnail handler
- 6If a specific format never showed thumbnails: the app needs to register a handler
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