For example: install the 32-bit version in your "Program Files (x86)" folder and the 64-bit version in your "Program Files" folder (install 32-bit PlugIns to IrfanView-32 and 64-bit PlugIns to IrfanView-64, DO NOT mix the PlugIns and IrfanView bit versions)
You can install both versions on the same system, just use different folders. Command line options for scanning (/scan etc.) work only in 32-bit ( 64-bit TWAIN drivers are rare => in case of problems, use IrfanView-32 for scanning). 
Some old 32-bit PlugIns work only in compatilibilty mode in IrfanView-64. 
All PlugIns will work: not all PlugIns are ported (yet) to 64-bit (like OCR) and some 32-bit PlugIns must be still used in the 64-bit version, some with limitations (see the "Plugins32" folder). Loads all files/images for normal needs (max. Runs 'only' on a 64-bit Windows (Vista, Win7, Win8, Win10, Win11)Īdvantages of IrfanView 32-bit over 64-bit version:. 
Faster for very large images (25+ Megapixels, loading or image operations).It can load VERY large files/images (image RAM size over 1.3 GB, for special users).Starting with IrfanView 4.40 there is also a 64-bit version available.Īdvantages of IrfanView 64-bit over 32-bit version:
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