Excel Sheet Merger
Combine sheets by column name, so nothing lands in the wrong field.
How this reads your output
Each sheet's header row is read and the union of all column names becomes the output header, with every row rebuilt by looking up its own sheet's column positions. Matching on the name rather than the position is the whole point. A positional concatenation is what a naive merge does, and two sheets with the same columns in a different order combine into a file where half the rows have the postcode in the name field — with no error anywhere, because both files were valid and the row counts add up. Matching by name makes that impossible, and a column present in only some sheets becomes blanks rather than a shift.
What the results mean
- Matched on column name
- Not position. This is what prevents data landing in the wrong field.
- Columns missing from some sheets
- Filled with blanks. The row keeps its alignment.
- Two similar column names
- Kept separate. Guessing that Postcode and Post code mean the same thing is how a merge corrupts data.
- Sheets merged
- Every sheet in every file selected, listed so you can check before converting.
Common problems and fixes
- I have two columns that should be one
- The headers differ in spelling or spacing. Make them identical in the source sheets — merging them here would mean guessing, which is exactly the risk this tool avoids.
- A sheet's data is in the wrong columns
- That cannot happen here, since matching is by name. If it looks wrong, check that the sheet's first row really is its header.
- Working notes got merged in
- Every sheet in each file is included. Remove the sheets you do not want, or save the tables to a separate file first.
Frequently asked questions
Why match on column name rather than position?
Because position is how a merge corrupts data invisibly. Two files with the same columns in a different order concatenate into rows where fields are swapped, and nothing about the result looks wrong — the columns are there and the row count is right.
What happens to columns only some sheets have?
They become part of the output and rows from sheets without them are blank in that column. Dropping the column would lose data; shifting the row would corrupt it.
Will it merge columns with slightly different names?
No, and deliberately. Deciding that two similar headers mean the same thing is a guess, and a wrong guess merges two different fields into one. Make them match in the source.
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