Analyse which sheets, named ranges, images, and data areas contribute most to your XLSX file size. Pro tier.
Free is enough for most one-off jobs. Pro raises the file and batch caps; Pro + Media unlocks GB-scale streaming and unlimited duration.
Larger files supported on Developer (5 GB CSV) and Enterprise (unlimited). All processing happens in your browser — files never reach a server.
Upload your XLSX file
The ZIP structure of the XLSX is inspected — each component's size is measured
A breakdown shows sheets, embedded images, styles, shared strings, and VBA by size
0 bytes uploaded. Workbook Weight Analyzer runs entirely in your browser using SheetJS and ExcelJS. Your spreadsheets never leave your device.
Embedded images and excessive conditional formatting rules are the most common causes of bloat. Shared string tables grow with large text datasets.
The tool identifies and reports — removal tools (comment purger, VBA stripper, image extractor) handle the cleanup.