Choose the directory or file you wish to process. There is no need to put files into a TAR archive beforehand.
Q: Can I compress multiple files at once? A: [insert answer] razor xtool compress app
Don't just compress once. Run your files through twice. First pass at 85% quality (lossy), second pass to strip metadata. Razor XTool’s algorithm actually gains 5-7% more reduction on the second pass without visible degradation. Choose the directory or file you wish to process