Merge TSV Files Online
Merge and concatenate multiple TSV files into one, directly in your browser.
How to merge TSV files
- Click the upload area to add your first file. It is loaded in the browser and listed with its row and column count.
- Click + Add File to add the next file, one at a time. Use Remove next to any file you added by mistake. If the files do not all have the same columns, a note says so. They still merge, matched by column name.
- Once two or more files are listed, click Merge Files. Rows are stacked in the order the files were added, and the total row count is shown.
- Check the preview of the first 200 rows, then click Download merged to save merged_result in the same format.
Your file is processed locally in your browser and is never uploaded. The free limit is 50 MB per file; larger files work if your device has the memory for them.
Worked example
Two regional teams send in their July expense sheets. The south team lists the columns in a different order and adds a category column the north team does not use. The north file is shown below.
Input (TSV)
rep expense_date amount
Ines 2026-07-01 120.5
Ines 2026-07-08 33
Marek 2026-07-02 210Settings
- File 1: north expenses (shown above)
- File 2: south expenses, columns amount, rep, expense_date, category, with rows (54.2, Kofi, 2026-07-03, meals) and (18, Kofi, 2026-07-09, parking)
Result
| rep | expense_date | amount | category |
|---|---|---|---|
| Ines | 2026-07-01 | 120.5 | NULL |
| Ines | 2026-07-08 | 33 | NULL |
| Marek | 2026-07-02 | 210 | NULL |
| Kofi | 2026-07-03 | 54.2 | meals |
| Kofi | 2026-07-09 | 18 | parking |
Columns are matched by name, not position, so the south file's amount values land under amount even though that column comes first in its file. Column order follows the first file, and category is added at the end because only the second file has it. North rows get NULL for category. Rows keep file order: first file, then second.
Frequently Asked Questions
Do all files need exactly the same columns?
No. Columns are matched by name, ignoring case. A column missing from one file is filled with NULL for that file's rows, and columns can appear in any order.
Is this a join on a key column?
No. Merge stacks rows from one file under another, which SQL calls UNION ALL. To match rows from two files on a shared ID, use the SQL Query tool with a JOIN.
Are duplicate rows removed when merging?
No. Every row from every file is kept. Run Remove Duplicates on the merged file if the inputs overlap.
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