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What is CSV Cleaner & Deduplicator?

Free CSV cleaner and deduplicator. Remove duplicate rows, trim whitespace, and drop empty rows from any CSV in one pass. Proper parsing handles quoted fields, embedded commas, and line breaks. Runs 100% in your browser — your data is never uploaded. No signup.

No file uploadsNo tracking of inputsNo account requiredWorks offline after first load

CSV Cleaner runs entirely in your browser using JavaScript (browser). Your data never leaves your device.

Free CSV Cleaner & Deduplicator

Clean up a messy CSV in seconds. Paste your data or upload a file, then remove duplicate rows, trim stray whitespace, and drop empty rows in a single pass. Proper CSV parsing handles quoted fields, embedded commas, and line breaks inside cells, with comma, semicolon, and tab delimiters supported. Everything runs in your browser, so spreadsheets with personal data stay private.

Free to embed on your website · No signup required

Handles quoted fields, embedded commas, and line breaks. Your data is parsed entirely in your browser — nothing is uploaded.

Frequently Asked Questions

The tool compares whole rows and keeps only the first occurrence of each, preserving the original order. If you enable the header-row option, the header is always kept and only the data rows are deduplicated.
Yes. It uses proper CSV parsing with full quote handling, so a value like "Smith, John" inside quotes is treated as a single field. It also handles escaped double-quotes and line breaks within quoted cells, then re-quotes fields correctly on output.
No. Your CSV is parsed and cleaned entirely in your browser. Nothing is transmitted, so it is safe for spreadsheets containing emails, customer records, or other personal data you should not paste into an online chatbot.
Comma (standard CSV), semicolon (common in European locales), and tab (TSV). Pick the one your file uses; the cleaned output is written with the same delimiter.
Yes. The cleaned output is standard CSV with correct quoting, so it imports cleanly into Excel, Google Sheets, Numbers, or any database import tool. You can copy it or download it as a .csv file.

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Clean Up a Messy CSV in Seconds

Exported data is rarely tidy. This tool parses your CSV — correctly handling quoted fields, embedded commas, and line breaks inside cells — and lets you remove duplicate rows, trim stray whitespace, and drop empty rows in one pass. Paste the data or upload a .csv file, toggle the options you want, and copy or download the clean result.

Remove Duplicate Rows

Deduplication compares entire rows and keeps only the first occurrence of each, so mailing lists, exports, and merged datasets lose their repeated entries while preserving order. With a header row enabled, the header is always kept and only the data rows are deduplicated.

Why Clean CSVs in Your Browser

CSV files frequently contain customer emails, order records, or other personal data you should not paste into an online chatbot or upload to an unknown converter. This tool runs entirely in your browser — your rows are parsed locally and never transmitted — so it is safe for spreadsheets that contain PII.

Robust Parsing

A naïve split on commas breaks the moment a field contains a comma or a line break. This tool implements proper CSV parsing with quote handling (including escaped double-quotes), supports comma, semicolon, and tab delimiters, and re-quotes fields correctly on output so the cleaned file opens perfectly in Excel, Google Sheets, or any database import.