ExcelToolkit Pro Blog https://exceltoolkitpro.com/blog/ Practical writing about spreadsheets: formulas, data quality, performance and privacy. en-us Tue, 08 Jul 2025 07:00:00 GMT https://exceltoolkitpro.com/og/blog.png ExcelToolkit Pro https://exceltoolkitpro.com How to merge hundreds of workbooks without writing a macro https://exceltoolkitpro.com/blog/merge-hundreds-of-workbooks/ https://exceltoolkitpro.com/blog/merge-hundreds-of-workbooks/ Monthly branch reports, regional exports, one file per client. Here is how to consolidate them reliably, including the header-mismatch problem nobody warns you about. Tue, 08 Jul 2025 07:00:00 GMT Priya Nair tutorials What your spreadsheet reveals about you when you email it https://exceltoolkitpro.com/blog/what-your-spreadsheet-leaks/ https://exceltoolkitpro.com/blog/what-your-spreadsheet-leaks/ Author names, internal folder paths, hidden sheets, tracked revisions and comment authors all travel with the file. Most people never check. Mon, 02 Jun 2025 08:00:00 GMT Daniel Osei security A repeatable process for cleaning messy CSV exports https://exceltoolkitpro.com/blog/clean-messy-csv-exports/ https://exceltoolkitpro.com/blog/clean-messy-csv-exports/ The same six problems appear in every system export. Fixing them in a fixed order takes ten minutes and never has to be reinvented. Tue, 13 May 2025 07:30:00 GMT Priya Nair data-quality Your 3,000-row workbook is 40 MB. Here is where the bytes went. https://exceltoolkitpro.com/blog/excel-file-too-large/ https://exceltoolkitpro.com/blog/excel-file-too-large/ File size rarely correlates with data volume. It correlates with style records, phantom used ranges and pivot caches nobody knew existed. Tue, 22 Apr 2025 08:00:00 GMT Daniel Osei performance Why your VLOOKUP returns #N/A when the value is clearly there https://exceltoolkitpro.com/blog/why-your-vlookup-returns-na/ https://exceltoolkitpro.com/blog/why-your-vlookup-returns-na/ Nine times out of ten it is not the formula. It is an invisible character, a number stored as text, or an approximate match you never asked for. Tue, 04 Mar 2025 09:00:00 GMT Elena Marsh formulas XLOOKUP vs INDEX/MATCH: which one, and when it actually matters https://exceltoolkitpro.com/blog/xlookup-vs-index-match/ https://exceltoolkitpro.com/blog/xlookup-vs-index-match/ XLOOKUP is better in almost every case. The exceptions are real, though, and worth knowing before you rewrite a model. Tue, 11 Feb 2025 09:00:00 GMT Elena Marsh formulas