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Helper utility for cbz/cbr files (comic books mostly) content scaling and converting to WebP format:

source: any format recognized by 7-zip (zip, rar, tar, 7z = cbz, cbr, cbt, cb7 respectively),
conversion to WebP format with libwebp (typically 2-3 times smaller image sizes),
optional image resampling (percentage),
output: zip (cbz) with no compression.

Depending on resampling used output files are at least 2.5 times smaller than source with subjectionably neglectable quality loss. When combining conversion to WebP with 50% resampling from 1920px output files are typically 10 times smaller than source. Application is native and portable, settings are stored in local ini file, there are no dependencies on any runtime framework or non-standard dlls (except for those distributed along with it, i.e. 7z.dll).

Note: source files are immediately extracted to temporary subdirectories which allows browsing/editing content before converting. Make sure you have enough disk space to extract all queued files.

Currently application has 260 characters paths limitations. It's recommended to run application from location near to drive root if converted files have long names (application is creating temporary subdirectories with same names as file names and extracts file contents to them).