About Merge CSV files
Merge CSV files online to consolidate compatible exports from several periods or sources. You can combine CSV files with the same headers and append their records in file order. Literal header names are preserved, the result keeps one header row, and matching rows are not removed automatically.
How to combine multiple CSV files
- Select CSV files whose header names and order match.
- Arrange the files and review formula-cell protection.
- Select Process and download the combined merged.csv.
A practical example
- Input
a.csv: name,count then Ada,2. b.csv: name,count then Lin,3.
- Result
One CSV with the name,count header followed by Ada,2 and Lin,3.
The merge appends rows. It is not a database join and does not match records by an ID.
Supported input and limitations
- Headers must match exactly and appear in the same order. Duplicate header names are rejected.
- Up to 100 files and 5 MB total are accepted. There is no column reconciliation, duplicate-row removal, or key-based join.
Processing happens on your device. Read about local processing and optional workspace recovery.
Frequently asked questions
Can I merge CSV files with different columns?
Not here. Standardize the column names and order before selecting the files. Mismatched headers produce an error rather than dropping data silently.
Does merging CSV files remove duplicate rows?
No. Every parsed record is appended. Continue to Remove duplicate CSV rows to match entire records or selected key columns before choosing the fields to export.