What can the CSV cleaner fix?

It can detect common text delimiters, trim cells, remove blank rows and columns, normalize headers, normalize money and date values, protect spreadsheet formulas, preview results, and export a clean CSV.

Can I use the cleaned CSV in Excel or Google Sheets?

Yes. The exported CSV is designed for spreadsheet tools such as Excel, Google Sheets, Numbers, Airtable, and database import workflows.

Free CSV Cleaner Online - Private Browser CSV Formatter

Q: Does this CSV cleaner upload my file?

No. The CSV cleaner runs in your browser and does not send file contents to a server.

Upload CSV

Drop a CSV, TSV, or XLSX file here Upload is the default. Paste mode is below. XLSX first worksheets are supported; legacy XLS and JSON are not parsed.

Choose file

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CSV stays local. No upload. No account.

Clean Options

Trim cells

Remove blank rows

Remove blank columns

Normalize headers

Normalize money

Normalize dates

Formula-safe export

Excel UTF-8 BOM

Turn on Excel UTF-8 BOM if accents, currency symbols, or non-English characters open wrong in Excel.

Paste CSV instead

0Raw rows

0Clean rows

0Columns

0Rows removed

0Cells changed

Preview

Clean CSV Files Online Without Uploading Data

Universal CSV Cleaner is a private CSV cleaner and CSV formatter for messy spreadsheet exports. It runs locally in your browser, so order exports, inventory reports, payment CSV files, marketplace downloads, TSV files, and customer rows stay on your device.

Use it when a CSV file opens badly in Excel or Google Sheets, has duplicate headers, contains empty columns, uses comma, semicolon, tab, or pipe delimiters, mixes date formats, includes currency symbols, or needs a safer import-ready format.

What This Free CSV Cleaner Fixes

Messy spreadsheet rows

Remove blank rows and empty columns, trim extra spaces, and keep a cleaner rectangular CSV shape for spreadsheet import.

Bad or duplicate headers

Turn headers like " Order Date " and "Sale Price" into simple, unique field names such as order_date and sale_price_2.

Safer CSV exports

Protect values that can be interpreted as spreadsheet formulas, then export a clean CSV for Excel, Google Sheets, Numbers, Airtable, or database tools.

How to Clean a CSV File

Drop a CSV, TSV, or XLSX file into the upload area, choose a local file, or paste CSV/TSV text.
Keep the default clean options on, or turn off anything you want to preserve.
Check the preview table and cleaning stats before export.
Download the cleaned CSV and import it into your spreadsheet or database tool.

Before and After CSV Cleanup Example

This is the kind of cleanup the tool is built for: whitespace, duplicate headers, money formatting, blank columns, and spreadsheet formula safety.

Formula-safe export keeps dangerous spreadsheet-looking values as text.
Messy CSV value	Clean CSV value
Order Date	order_date
"$1,240.50"	1240.50
05/08/2026	2026-05-08
=SUM(A1:A2)	'=SUM(A1:A2)

The leading apostrophe before =SUM(A1:A2) is intentional. It prevents Excel, Google Sheets, and other spreadsheet tools from running the value as a formula when the CSV is opened.

Best For Common CSV Export Problems

Excel CSV cleanup before formulas, pivot tables, or reports.
Google Sheets import cleanup for ecommerce, marketplace, inventory, and order data.
CSV formatter workflows before Airtable, Notion, database, CRM, or accounting imports.
Private cleanup of sensitive business CSV files when you do not want to upload data to a server.

CSV Cleanup Guides

Clean CSV for Excel

Fix common CSV import problems before opening data in Excel, including encoding, blank columns, duplicate headers, and formula-looking values.

Clean CSV for Google Sheets

Prepare marketplace, ecommerce, and payment exports for cleaner Google Sheets imports and easier spreadsheet analysis.

CSV Delimiter Detector

Learn how comma, semicolon, tab, and pipe-delimited files differ, and why auto-detection matters before importing data.

XLSX to CSV Cleaner

Load the first worksheet from an Excel `.xlsx` workbook in your browser, clean it, and export standard CSV.

CSV Injection Examples

See formula-looking values that spreadsheets may run, and how formula-safe export keeps risky text as text.

UTF-8 BOM for Excel

Learn when the Excel UTF-8 BOM option helps accents, currency symbols, and non-English text open correctly.

CSV Delimiter Errors

Spot one-column imports, split money values, and mixed delimiter problems before spreadsheet import.

Google Sheets CSV Checklist

Check delimiters, headers, blanks, dates, money, formula safety, and row counts before importing.

Shopify CSV Cleanup

Prepare exported product or order CSV files for spreadsheet review without using any store API.

Etsy CSV Cleanup

Clean exported listing, order, or payment CSV files before sorting and checking them in a spreadsheet.

PayPal CSV Cleanup

Prepare transaction exports for spreadsheet review while preserving original files and checking totals.

Messy CSV Before and After

Compare a fake messy CSV with cleaned output for headers, blanks, money, and formula-safe values.

CSV Cleaner FAQ

Does this CSV cleaner upload my file?

No. The cleaner uses browser JavaScript and does not send CSV contents to a server. It is designed for private local cleanup.

Is this CSV cleaner free?

Yes. The public CSV cleaner page is free to use.

Can it clean CSV files for Excel and Google Sheets?

Yes. It exports standard CSV text and includes an optional UTF-8 BOM setting for Excel compatibility.

What CSV problems does it not solve?

It does not repair every possible broken export, infer missing business data, provide tax advice, or connect to private marketplace APIs.

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