SheetMerge
Combine sheets and CSV files into one master sheet — append the rows, keep one header, skip the hour of copy-paste.
€29 one-time · free tier, free forever · 30-day money-back
Twelve sheets, one report due
Every month the same ritual: a sheet per region, a CSV per export, and a "master" tab you assemble by hand. Copy, paste, delete the extra header row, scroll, repeat — and hope you didn't paste February over January.
SheetMerge stacks them in one click. Pick the sheets in your workbook (and CSV files from your disk), and SheetMerge appends all the rows under a single header. Pro adds a source column so every row says where it came from, and column mapping for when the headers don't quite match.
Honest scope: SheetMerge combines sheets in your open workbook plus CSV files you pick. It deliberately doesn't try to parse closed .xlsx files in the browser — open the workbook (or export to CSV) and merge reliably instead.
Free vs Pro
Free handles the monthly three-sheet merge. Pro handles the messy real world: many sources, mismatched headers, audit trails.
| Feature | Free | Pro €29 |
|---|---|---|
| Combine up to 3 sheets / CSV files | ✓ | ✓ |
| Append rows, keep a single header | ✓ | ✓ |
| Unlimited sheets & CSV files | — | ✓ |
| Merge all sheets of the workbook at once | — | ✓ |
| Add a source column (sheet/file name per row) | — | ✓ |
| Column mapping when headers differ | — | ✓ |
How it works
Install the free add-in
Two minutes, no account, no card. Upload the manifest via Insert › Add-ins — see the install guide.
Use the free tools
Stack up to three sheets or CSV files into a master. Free forever — not a trial.
Unlock Pro when you need it
Buy once on Gumroad, paste your license key into the pane. Pro tools unlock instantly, on all your devices.
Installing SheetMerge
In Excel (Windows, Mac, or web): Insert › Add-ins ›
My Add-ins › Upload My Add-in, then select the SheetMerge
manifest.xml. A SheetMerge button appears on your ribbon.
Coming to AppSource: SheetMerge is being submitted to Microsoft's add-in marketplace, after which it installs in one click from inside Excel. Sideloading works today.
FAQ
Can it merge closed .xlsx files directly?
No — and that's deliberate. Parsing .xlsx files inside the add-in would mean bundling a heavy library and fragile edge cases. SheetMerge merges the sheets of your open workbook and imports CSV files, which covers the real workflow reliably. Open the other workbook (or save it as CSV) and you're merging in seconds.
What happens to the extra header rows?
SheetMerge keeps one header at the top and skips the headers of every subsequent source — the thing you always forget when copy-pasting.
Does my data leave Excel?
No. Sheets are read locally, CSV files are read in your browser/app via the file picker — nothing is uploaded anywhere. See the privacy policy.
Refunds?
30-day money-back guarantee, no questions asked — reply to your Gumroad receipt or email [email protected].