How to identify the biggest contributors to excel file bloat
- Step 1Upload your large XLSX file — Drop the oversized workbook onto the Weight Analyzer.
- Step 2Review the size breakdown — The report shows compressed and decompressed sizes by category and lists the top 10 largest files.
- Step 3Take action based on results — Images → compress or remove them. VBA → use VBA Macro Stripper. Comments → Comment Purger.
- Step 4Re-analyze after cleanup — Upload the optimized file to confirm the size reduction.
Frequently asked questions
What is the most common cause of Excel bloat?+
Embedded images are the most common cause. Excel stores images at full resolution inside the ZIP. Compress images in Excel (Picture Format → Compress Pictures) before saving.
Does the Weight Analyzer modify the file?+
No — it is purely diagnostic. It reads the ZIP structure and reports sizes without making any changes.
Privacy first
Every JAD Excel tool runs entirely in your browser using SheetJS and ExcelJS. Your spreadsheets, formulas, and data never leave your device — verified by zero outbound network requests during processing.