Merge TSV Files
Merge two TSV files online. Match rows by key column, choose the winning side per row, and export the merged tab-separated table. Nothing is uploaded.
Files never leave your browser.
About TSV Merge
Pick winning rows between two TSV files. Uses the same engine as CSV merge configured for tab delimiters.
How to use
- Load both TSV files.
- Configure Key columns so rows can be matched stably.
- Resolve each differing row and export the merged file.
Try a sample
A key/value config with several edits and one new entry.
What this tool doesn't handle
- Cell-level merging within a row is not supported.
- Requires consistent column counts per row.
Frequently asked questions
Do my files ever leave my browser?
No. Every comparison runs locally in your browser. Nothing you paste, drop, or load is uploaded to a server; the tool keeps working even if you go offline after the page loads.
Is this tool free to use?
Yes. All DiffResolver tools are free, with no account, sign-up, or installation. Because processing happens on your device, there are no server-imposed usage limits.
Can I merge spreadsheet data copied from Excel?
Yes. Copied spreadsheet ranges paste as tab-separated text, which this tool reads directly. Merge the rows you want, then paste the result back into your sheet.
How are conflicting rows resolved?
Rows are matched by your configured Key columns; for each row that differs you pick the left or right version, then export the merged TSV.
Is there a file size limit?
No server limit applies, because nothing is uploaded. The memory of your device sets the practical limit. Above 10 MB for text, 40 MB for images, 100 MB for documents, or 500 MB for archives, the tool warns you that the work can be slow, but it never blocks the file.
Does this tool work offline?
Yes. The browser keeps a copy of the tool after the first visit, so a page you opened before still works without a network. You can also install DiffResolver as an app from the browser menu. Installation stays optional; the site works the same in a normal tab.
Where is my data stored?
Your files are stored nowhere. They stay in the memory of the page and are gone when you close the tab. Only what you save yourself stays in this browser: a snapshot, your tool options, and your theme. To remove it, open Settings and select Clear all local data.