Simple from start to finish

How MergeStudio works

Choose your files, decide how rows should combine, actively choose the match columns, review what counts as a match, pick your output columns, then preview and download the finished workbook.

Start merging →Try the sample data
Customers.xlsx+Orders.csv→Merged.xlsx ✓
1

Add your Excel or CSV files

Choose two or more files, or one Excel workbook with multiple tabs. Normal jobs are read locally in your browser.

XLSXXLSCSV
2

Choose the sheets you want to combine

Select the worksheet tabs that belong in this merge. If a file starts with a title or notes above the real column headers, use the Header row selector.

3

Choose what kind of result you want

Pick Matches Only, Master + Enrich, Keep Everything, or Stack Rows. Match-based joins are the default path; Stack Rows skips the next two matching steps.

4

Choose the match columns

For joins, actively choose the column—or up to five columns—that identify the same record in every sheet. MergeStudio does not preselect a match field for you.

Customer IDEmail + ZIPOrder ID
5

Review the matching rules

Decide whether equivalent numbers and spacing differences should count as matches. You can see the live match impact before choosing output columns.

007 = 7extra spacesignore all spaces
6

Choose the output columns

Select only the fields you want, optionally add Source File / Source Sheet provenance, and review the pre-merge summary. For Stack Rows, MergeStudio can suggest differently named columns that may mean the same thing; you decide whether to combine them.

7

Reconcile, preview and download

Review matched and unmatched rows, duplicate-key and fan-out warnings, active matching rules and the result preview, then download Excel or CSV.

Control exactly what counts as a match

Matching rules affect comparison only. MergeStudio never rewrites the values that get exported.

Match equivalent numbers
007=7

Useful when Excel dropped leading zeros from an ID. Turn it off for strict identifiers.

Normalize extra spaces
car  door=car door

Handles repeated spaces, tabs, line breaks and non-breaking spaces consistently.

Ignore all spaces · Aggressive
car door=cardoor

Off by default because it can combine identifiers that may genuinely be different.

Join or stack?

Use a join when separate files describe the same customers, orders, products or accounts. Use Stack Rows when the files have similar columns and you simply want one longer list.

Matches Only

Keep records whose match key appears in every selected source.

Master + Enrich

Keep every row from one main sheet and add data from the others when a match exists.

Keep Everything

Keep both matched and unmatched records from all selected sources.

Private browser processing

🔒
Spreadsheet contents stay on your device for normal jobs.

Parsing and merging happen in the browser using JavaScript and a Web Worker. Large jobs that exceed local safety limits are stopped rather than silently uploaded.

Ready to try it?

You do not need an account, payment method or formulas. Add your files and follow the seven steps.

Merge spreadsheets →