Zitat:

Q: How to reduce saved file size from XX to YY KB?
A: There is no one-click solution for that, sorry.
1. Open an image.
2. Go to menu Image->Resize/Resample and reduce the image dimensions in pixels.
3. Go to menu File->Save as, choose JPG and save as new file (see also JPG save options like: lower JPG quality, uncheck EXIF, etc.).
4. Look at the file size of the new file. If still too big, repeat the steps, using smaller pixel size and/or lower quality, etc.
X. For many images, use File->Batch Conversion, Advanced options.
Note: since version 4.20, a new JPG save option has been allowed: Set file size. IrfanView PlugIns must be installed.