Fusionner des fichiers Excel

Merge Excel: bring scattered spreadsheets into one workbook

Monthly reports from different branches, survey results split by region, inventory lists kept by separate teams — spreadsheet data has a habit of living in several files when it should live in one place. Merge Excel combines multiple Excel files into a single workbook, giving you two sensible structures to choose from: keep each source file as its own sheet, or pour all the data into one combined sheet.

The two modes serve different jobs. One-sheet-per-file is right when the sources are related but distinct — January, February, and March reports, for example — because each month stays intact and easy to compare. A single combined sheet is right when the files are really one dataset that got split apart, such as regional sales rows that should be filtered, sorted, and totalled together. Picking the wrong mode is the most common mistake: a combined sheet of incompatible tables produces a mess, while separate sheets for identical tables waste the chance to analyse everything at once.

How to merge Excel files

1. Open Fusionner des fichiers Excel and add the Excel files you want to combine.
2. Choose your structure: one sheet per file, or all data combined into a single sheet.
3. If you chose the combined sheet, make sure the files share the same columns in the same order — identical headers line up cleanly, mismatched ones do not.
4. Run the merge and download the workbook, then spot-check it: confirm row counts look right, headers appear once at the top, and no data was duplicated.

When to use it — and when not to

Use it when consolidating recurring reports, gathering team submissions, or assembling one dataset from regional or departmental files. Don't use it when the files have different column structures and you chose the combined mode anyway — standardise the headers first. Also skip it for files that need calculations reconciled rather than stacked: merging appends data, it does not deduplicate rows or resolve conflicting figures, so clean the inputs before you combine them.

Frequently asked questions

Which mode should I pick: separate sheets or one combined sheet?

Separate sheets when each file is a standalone report you want to keep distinct; one combined sheet when every file has the same columns and you want to sort, filter, or total the whole dataset together.

Do formulas survive the merge?

Values carry over reliably, but formulas that reference other workbooks or specific sheet layouts may not behave the same in the new structure. Check any calculated columns after merging.

What about formatting and column widths?

Basic formatting is preserved, but a combined sheet adopts one consistent layout, so columns may need resizing afterwards.

Where does the processing happen?

Entirely on your device, inside your browser. Your spreadsheets are never uploaded, which is exactly what you want when they hold salaries, sales figures, or customer data.

Related tools: Excel vers PDF, PDF vers Excel, Fusionner des PDF.