JPEG 2000 (.jp2) thumbnails in Windows Explorer
JPEG 2000 files (.jp2, .j2k, .j2c, .jpc, .jpf, .jpm and .jpx) get real thumbnails in File Explorer with SageThumbs 2K.
What you see
- Decoding goes through the trimmed ImageMagick engine that every SageThumbs 2K install includes.
- The Explorer preview pane and Quick preview show the image large.
Limits
- The small preview inside the right-click menu skips formats that need ImageMagick and shows the file name and size instead. Their thumbnails in Explorer are unaffected.
- In OneDrive and other synced folders, files stored on the PC get thumbnails as anywhere else. Online-only files are left to the cloud app, since nothing is downloaded just to draw a thumbnail.
More you can do
- The Convert dialog writes JP2, and turns JPEG 2000 files into PNG, JPG or WebP.
Extensions this covers
.jp2 .j2k .j2c .jpc .jpf .jpm .jpx
See every format SageThumbs 2K supports or browse all format guides.
Get SageThumbs 2K
Install it with winget:
winget install LunarWerxs.SageThumbs2KOr download the installer from GitHub and run it.
Windows 11 and 10, 64-bit, on x64 and Arm. The same page has a portable zip that needs no installing.
Free for personal use
Home, hobby and other non-commercial use is free: every format and every tool. A company, a shop or anyone doing paid work needs a business licence for each PC.
A business licence is US$49 per PC once, with 12 months of updates, or US$2.99 per PC a month. See business licence pricing
Thumbnails not showing?
- Windows caches thumbnails, and a file it failed on once stays failed. In SageThumbs, Settings ▸ Advanced ▸ Rebuild thumbnail cache clears the cache and restarts Explorer.
- Make sure File Explorer's "Always show icons, never thumbnails" option is off, and that the format is ticked in SageThumbs Settings ▸ File types.
- Run
st2k doctorin a terminal. It only reads, checks the whole chain, and prints a fix under anything that is wrong.