How are duplicate headers handled?
The first header is kept; matching headers in later files are skipped.
Merge toolLocal processingHeader-aware row merge
Merge TSV
Merge TSV files by keeping the first header and appending rows from later files.
Accepted files
TSV
Add at least two valid files. The first valid file sets the format for this merge batch.
Files to merge
Use Move up and Move down to choose output order.
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Drop files here
Upload multiple TSV files, arrange them, then merge into one download.
No files added yet.
What this tool does
Merge TSV combines tab-separated files into one, keeping a single header and appending each file's rows beneath it. It is the TSV counterpart to a CSV merge, ideal for stacking same-schema exports from databases and analytics tools into one tidy file.
How it works
Add your TSV files, set the order, and the tool appends the rows in your browser, keeping the first header and skipping matching duplicates. The merged file downloads as merged.tsv. Nothing is uploaded.
When to use Merge TSV
Combining same-schema TSV exports
Stacking analytics or database dumps
Building one dataset from several TSV files
Merging TSVs without uploading them
FAQ
Does it reformat the data?
No. It appends rows in order and keeps the tab structure intact.
Are my files uploaded anywhere?
No. Everything runs in your browser and your data never leaves your device.