XnView Software

JPEG Lossless Rotator is the only program I know that's capable of changing the EXIF orientation tag without messing with the rest of the JPEG. It relies on 2 DLLs from Pierre-Emmanuel Gougelet's GFL SDK:

• jpgrotate.dll = GFL.DLL
• jpegrotate.dll = GFLE.DLL

Please implement the same “minimally invasive procedure” in XnView's Reset EXIF orientation field (Tools → JPEG lossless transformations).