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Marketing CSV Merger
Different exports. One organized file.
Bring newsletter, CRM and event contact exports together. Align your columns, keep every contact field and save a single CSV without uploading your files.
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- 1Add files
- 2Review settings
- 3Save results
01Choose two or more CSV exports
02Bring your exports together
Match output column names to align fields across files. Different fields stay separate; missing values stay blank. No subscription status is changed.
Choose your files or try the example. Review the detected columns before creating any exports.
How it works
- 01
Choose two or more contact CSVs with header rows. Preview the detected fields before merging.
- 02
Give matching fields the same output column name. Keep different subscription or source fields separate, and optionally remove completely identical rows.
- 03
Save the merged CSV, then use the cleaner to review email formatting and duplicates. Resolve conflicting subscription records in your campaign platform.
First-version limits
2–10 files, 5 MB per file, 10 MB combined, 50,000 combined data rows and 100 output columns. Header rows required. CSV/TXT/TSV only, not XLSX. Identical-row removal is optional; subscription conflicts are not resolved.
File contents are held in memory for this tool session, not saved to browser storage. Use Clear data or leave the tool to release them. Downloads remain on your device. Ordinary site cookie settings still apply; the toolkit adds no file-content analytics.
Open your browser. Get the job done.
No app to install. Save only the results you want to keep.