Optimize and convert your document files (DOCX, XLSX, PPTX, DOCM, XLSM, XLSB, PPTM – MS Office and LibreOffice formats) to smaller size! Program optimizes your document file to new one with “_optimized” name ending (source file will remain intact). Maximum compression for office files without quality loss – up to 10-50% (Lossless)! Full compatible with original office format. The document is reduced by repacking the contents with a stronger compression algorithm. Batch processing of files (drag-n-drop). It uses 2 programs and selects the best result: ECT (Efficient Compression Tool), AdvanceCOMP. Compression mode: good (faster) or best (slowly). The main difference between Ultra7z Docx/xlsx/pptx Optimizer and other similar repackaging programs is that it saves quality of all pictures inside your documents. Full stats – saved disk space (Mb) total and for each archive in the list.