How to use Merge Excel & CSV
- Add your Excel or CSV files.
- Choose “stack into one sheet” or “one sheet per file”.
- Download the merged Excel or CSV.
Is it private?
Yes. Merge Excel & CSV runs 100% inside your web browser. Your files are never uploaded to a server, so even we can’t see them. That makes it a safe choice for sensitive spreadsheets, contracts, and personal documents.
Frequently asked questions
What if my files have columns in a different order?
Leave “align columns by header” on and matching columns line up automatically, even if their order differs.
Can I tell which rows came from which file?
Yes — keep the “Source File” column ticked.