How to reduce the file sizes

[johnesquivel]

Hello,
I'm using XnView to convert BMPs to JPGs. But I wonder how I can reduce the file sizes of around 150 JPGs by about half. Where do you enter the script to do this ?
Hope that someone can help me. Thanks in advance!

[cday]

If you are new to XnView software, or even if your are not, it would probably be best to install XnView MP, the current software, and use Tools > Batch convert... , on the Output tab select the JPEG save options that work best for you: you'll probably want to test different Quality values.

If you only actually need batch conversion, the very neat standalone XnConvert software is the batch conversion component of XnView MP. .

[michel038]

Sometimes I export photos in Webp format, this often divides their size by 5 or 10.

[Tapio]

Sometimes I export photos in Webp format, this often divides their size by 5 or 10.

Say goodbye to webp and aim for more compatibility - jpeg via the jpegli encoder. It's impressive. Example: I created picture with webp at -60 for my 4K HDTV in the native resolution. Now I replaced them by jpegli (-45) - still look as awesome, but are a bit smaller. Around 1 MByte. And jpegli encodes lightning fast.

[michel038]

Right, jpegli encoding seems faster, and the size can be 10% smaller than webp (xn V1.8.0)
- At 80% quality, appearance is nearly the same as the original jpg, even when zooming 400x. (jpegli and webp)
- Best compatibility
jpegli : Iptc and xmp metadata ok, opening file in an old photo editor is ok
webp : can't edit metadata in Xnviewmp, only preserves xmp. Can't open webp with an old software.

Thank you Tapio