There were numerous changes, here are only the more important things.

Version 4.70 ( - CURRENT VERSION - )

(Release date: 2024-10-11)

• New option: Keep existing alpha/transparency color (Properties->Viewing)
  Show checkerboard image; Alpha/Color also used for saving
• New option in Increase Color Depth dialog: 32 BPP (with alpha layer)
• New option in Replace Color dialog: Set transparent color (if 32 BPP image)
• New Image menu: Edit or Set alpha/transparency color>
• New option: Show Browse buttons in main window (Properties->Browsing)
• Fine Rotation option can work on selections
• New in OCR PlugIn: read QR or Barcode (thanks to ZXing guys)
• New slideshow hotkey: SHIFT + "," (comma): Toggle random and automatic time
• New Print dialog option: Reverse pages (for multipage images, page ranges)
• Support for EXIF data in WEBP files (EXIF dialog)
• Command line: "/effect" can be combined with "/slideshow", like:
  i_view64.exe /slideshow=c:\mypics.txt /effect=(30,0,0)
• Loading issues in several PlugIns fixed (thanks to Trend Micro)
  (CADImage, Formats, CamRAW, DjVu, JPM, ECW, WSQ)
• SVG PlugIn loading bugs fixed (thanks to nerty_nerty)
• EXR PlugIn loading bugs fixed (thanks to leeho and Who4mI)
• Several PlugIns are changed/updated, please install the newest versions:
  https://www.irfanview.com/plugins.htm

[ Older versions - History]