DatumFuse
Merge two spreadsheets online
Upload two files and let AI align the columns and join them for you — no formulas, no manual mapping.
Open AI Data Harmonizer →Merging two spreadsheets is rarely as simple as pasting one under the other. The files usually come from different systems, so the columns are named differently, ordered differently, and only partly overlap. The traditional fix is a VLOOKUP or INDEX/MATCH formula — fiddly to write, easy to break, and painful to audit when the result looks wrong.
DatumFuse takes a different approach. Upload both files and the AI reads the structure of each, recognizes which columns correspond even when the names do not match, and proposes how to join them. You confirm the mapping and the key, and it returns a single merged file. No formulas, no manual column-matching table, and a result you can actually review before you trust it.
How it works
- 1
Upload both spreadsheets
Add the two CSV or spreadsheet files you want to combine.
- 2
AI aligns the columns
It matches equivalent columns across the files automatically, even with different names.
- 3
Confirm the join key
Review the suggested mapping and the column to join on, and adjust if needed.
- 4
Download the merged file
Get one combined dataset ready for analysis or import.
Use cases
CRM + billing
Join customer records from your CRM with invoice or payment data that uses different IDs.
Enrich a contact list
Attach company or attribute data from a reference file onto a working list.
Combine team exports
Unify spreadsheets maintained by different teams whose formats have drifted.
Frequently asked questions
- How do I merge two CSV files?
- Upload both files to the Data Harmonizer; confirm the suggested column mapping and join key; download the merged file.
- Do the spreadsheets need matching column names?
- No. The AI matches columns by meaning, so "Cust ID" and "customer_number" are recognized as the same field.
- Is this really a free VLOOKUP alternative?
- Yes — you can try merging without writing any formula. It performs the column alignment and join for you.
- Can I check the result before downloading?
- Yes. You confirm how the files are mapped and joined before the merge runs.
Powered by the AI Data Harmonizer
Merge datasets from different sources with AI. Claude-powered schema matching aligns your columns automatically so you can join two spreadsheets without VLOOKUP.
Try the AI Data Harmonizer →