Workbook Optimizer
Make slow workbooks open and recalculate fast again.
Find and fix what makes a file sluggish: used ranges stretching to row a million, thousands of unique styles, orphaned defined names, unused shared strings and volatile formulas. Each finding comes with a one-click fix and an estimated saving.
- Rating
- 4.8(1.1K)
- Monthly uses
- 131K
- Price
- Free
or drag it here
.xlsx, .xlsm, .xls · processed locally, never uploaded
Files stay on your device
What it does well
- Used-range trimming that removes phantom rows and columns
- Style deduplication, often the single biggest win on old files
- Volatile formula and full-column reference reporting
How to use Workbook Optimizer
- 1
Upload the workbook that has become slow.
- 2
Review the findings, sorted by estimated impact.
- 3
Select the fixes you want to apply.
- 4
Download the optimised workbook.
Watch a walkthrough
Common problems and fixes
The file is still slow after optimising.
The bottleneck is probably calculation, not size. Check the volatile function and full-column reference findings and rework those formulas.
Conditional formatting disappeared.
Rules applied to entire columns are consolidated. Re-add them scoped to the real data range, which is faster anyway.
Frequently asked questions
What people say
Small thing, but the error messages actually tell you what to fix. Workbook Optimizer flagged a hidden character that had been breaking my lookups for weeks.
The preview before committing is the part that sold me — I could see exactly what workbook optimizer was going to change before it changed anything.
Exactly what I needed. Workbook Optimizer used to be a twenty-minute job with a macro I did not trust; now it takes one drag and one click.
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