Combine CSV Files into One Table
When the same kind of information is saved in separate exports, a CSV combiner can bring those records together in one file. Add two or more CSV or TSV files and this tool appends their data rows while matching values by column heading. That is useful when one export lists columns in a different order from another.
The first file sets the starting order of the combined headings. Any new heading found in a later file is added at the end. Rows stay grouped in the order files were added, and the original files are not changed.
How column matching works
The combiner reads the first row of each file as its heading row. It compares heading text exactly, then places each value under the corresponding heading. If a file does not contain one of the combined columns, that field is left blank for its records. A missing field will not shift values into neighboring columns.
Name,Email,City Sam,[email protected],Leeds
City,Name,Email York,Ana,[email protected]
Name,Email,City Sam,[email protected],Leeds Ana,[email protected],York
Matching is exact and case-sensitive. For example, Email, email, and Email are treated as separate headings. The combiner does not guess that two differently named columns mean the same thing, so standardize headings first if they should become one field.
Combine files and review the rows
- Select two or more CSV, TSV, or supported delimited text files. Each file can be up to 50 MB.
- Check the file list and row counts. Add more files or remove any source that should not be included.
- Review the combined table. Use the page controls to browse records beyond the first preview.
- Choose Download Combined CSV to save a new file containing the headings and all combined rows.
The table preview is paginated so large results remain easier to navigate. Downloads contain the complete combined dataset. CSV values containing commas, quotation marks, or line breaks remain together in their cells. TSV and supported delimited text inputs are converted to comma-separated CSV output.
What the combiner keeps and changes
The tool appends records; it does not sort them, remove duplicates, or select the newest record. Every file contributes its data rows in the order it was added. If two files contain the same record, both rows remain. Remove and add source files again if you need to change their order.
Blank rows and empty fields are retained where present. If a source has a different set of headings, its data is aligned to the combined heading list and absent fields are left empty. If a file has an unmatched quotation mark, the page reports a formatting error instead of creating a misleading result.
Combiner or merger: which should you use?
Use the CSV Combiner when files share headings but may list them in different positions, or when later files introduce extra headings. For combining files strictly by column position, use the CSV Merger and turn off heading matching. Browse all CSV tools for other data tasks.
Files are read and combined in your browser. Their contents are not sent to the RomitCSV server, and the source files are left as they were. The download is a new CSV created from the selected files.
CSV COMBINER FAQ
Questions About Combining CSV Files
Can I combine files with columns in a different order?
Yes. The combiner matches values using exact heading text, so columns can appear in different positions in each file.
Which file sets the output column order?
The first file sets the initial heading order. New headings found in later files are added to the end.
What happens if one file is missing a column?
The corresponding cells are left blank for rows from that file. Other values remain under their matching headings.
Does the combiner remove duplicate rows?
No. It appends all data rows in source order. Duplicate removal is a separate cleanup step.
Are column headings matched regardless of capitalization?
No. Matching is exact and case-sensitive. Differences in capitalization or extra spaces create separate output columns.
Can I combine TSV files?
Yes. CSV, TSV, and supported delimited TXT files are accepted. The combined download is CSV.
Can I add or remove files after loading them?
Yes. Add more files or remove a listed source before downloading the combined result.
Is there a file size limit?
Each input file can be up to 50 MB.
Are the files uploaded?
No. They are processed in your browser. The original files are not modified.
Check the combined headings before importing
Before using the download in another application, scan the headings and a few records from each source. Look for columns that differ only by capitalization or spaces, new fields added at the end, and blank cells where a source did not contain a field. This quick review helps confirm that the combined table matches the structure expected by your next step.