About CSV Merger
Join any number of CSV exports into one file. Headers are matched by name (case-insensitive), so files with columns in a different order still line up.
How to use CSV Merger
- Add your CSV files.
- Decide whether to add a “Source” column.
- Click “Merge files” and download the combined CSV.
Limitations
- Everything runs in your browser’s memory, so the practical file size depends on your device. As a rough guide: up to ~50 MB or ~500,000 rows works well on a modern laptop; phones and tablets handle much less.
- Very large files can make the tab slow or crash. If that happens, split the file first or use a desktop computer.
- Outputs keep values and formulas’ results but not formatting, charts, images, pivot tables or macros.
Frequently asked questions
Do all CSVs need the same delimiter?
No, each file’s delimiter is detected separately.
Is the header row repeated?
No, the output has a single header row.
How many files can I merge?
As many as your browser’s memory allows.
Disclaimer: Excel Tools by gumber.ai is a hobby project and is completely free to use. It is provided “as is”, without warranty of any kind. Always double-check results before relying on them, and keep a copy of your original files.