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Spreadsheet tool
Drop duplicate rows using one or more key columns. Export a clean unique table.
CSV Deduplicate removes duplicate rows by one or more key columns so merged exports and CRM dumps keep a single record per ID, email, or composite key. Choose whether to keep the first or last occurrence — all in your browser.
Duplicates sneak in when you merge monthly files, re-import the same contacts, or combine regional databases. Deduping on a business key (email, SKU, order ID) is safer than deleting “rows that look similar” by eye.
Select the columns that define uniqueness. A single email column is common for contact lists; order ID + line number may be needed for line-item tables. Keeping the first row preserves earliest data; keeping the last prefers the most recent extract in file order.
Deduplication does not magically merge conflicting field values — it drops extra rows that share the same key. If two duplicates disagree on a phone number, clean source data or filter first. Export UTF-8 CSV afterward for clean imports.
Spreadsheet tools on ezToolFlow process CSV/Excel-style data in the browser when possible. Prefer UTF-8 CSV for best compatibility.
Upload CSV (or convert Excel to CSV first). Skim the preview for the key columns you trust.
Choose one or more columns that define a duplicate. Select keep first or keep last when keys collide.
Export the deduplicated CSV and optionally sort or filter for the next workflow step.
Collapse repeated emails after merging event registration lists.
Ensure each product code appears once before bulk price updates.
Run after Merge CSV when overlapping date ranges reintroduced the same IDs.
Quick answers about tools, privacy, limits, and pricing.
About 20 MB is recommended so the browser stays responsive. Very large sheets may freeze on low-memory devices.
The tool treats the entire row (all columns) as the key, so only fully identical rows are removed.
Keep first if the file is chronological and earlier rows are authoritative. Keep last if later extracts overwrite older ones and the file order reflects recency.
Keys are compared on the exact cell text. Normalize casing with find-replace first if Email and email should match.
Deduping is designed for local browser processing so contact and order data can stay on your device.
Merge the files first, then dedupe on the shared key so cross-file duplicates are visible in one table.
Yes — rows with the same empty key values are treated as duplicates. Filter out incomplete rows first if blanks should be ignored.
Yes. CSV Deduplicate is free to use on ezToolFlow. Guests and free accounts may have daily limits on some tools; premium tiers can raise or remove those limits. AI tools may also spend credits.
For browser-based tools, processing runs on your device when possible and files are not uploaded for conversion. Optional accounts, usage limits, and AI features are described in our Privacy Policy.
No for most tools — you can start as a guest. An account helps keep higher daily limits and saved work (for example AI resumes).
Keep working with similar free tools — no signup required for most.
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