Free CSV Cleaner

Data Cleaning Tool

Upload a CSV file (up to 2MB / 2,500 rows) and CleanSheet detects column types, standardizes formats, and shows a before/after preview with confidence scores before you download the cleaned CSV. Free to use, no account required.

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CleanSheet Studio

Transform messy data into clean, professional spreadsheets

1 Upload

2 Preview

3 Clean

4 Export

Step 1: Upload Your Data

Drop your CSV file here to get started. We’ll automatically detect and clean your data.

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Drag & Drop Your File

Or click here to browse your files

CSV files up to 2MB / 2,500 rows (Excel coming soon)

Step 2: Cleaning Settings

Choose how you want your data cleaned. We’ve pre-selected the best options based on your file.

Email Cleaning

Standardize email formats to lowercase

Phone Numbers

Format phone numbers consistently

Names & Text

Proper case formatting for names

Dates

Standardize date formats to YYYY-MM-DD

Remove Duplicates

Find and remove duplicate rows

Empty Rows

Remove completely empty rows

💡 Quick Tips

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File Format: For best results, ensure your CSV has clear column headers in the first row.

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Performance: Files under 5MB process faster. Consider splitting larger files.

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Preview: Always preview your changes before applying them to see exactly what will be cleaned.

What gets cleaned

Data type	Before	After
Phone	555.123.4567	(555) 123-4567
Email	[email protected]	[email protected]
Date	Jan 3 2024	2024-01-03
Name	sam o’neil	Sam O’Neil
Whitespace	extra spaces	extra spaces

Frequently asked questions

What file types can I upload?

CSV files up to 2MB or 2,500 rows. Excel support is coming soon; in Excel, use File > Save As > CSV (Comma delimited) and upload that.

What if my file is bigger?

Credit packs for larger files are coming soon. Join the waitlist on the homepage to hear when they land.

Does it change my data without asking?

No. Every change is shown in a before/after preview with a confidence score, and nothing is applied until you choose to apply it. Every rule the tool uses is documented on the How Cleaning Works page.

Is my data stored?

Files are processed on our server to run your cleaning session, and exports are deleted after 24 hours. Do not upload files containing passwords, government ID numbers, health records, or other regulated data. See the privacy policy, or contact us to request deletion of a session.

What does it cost?

The tool is free up to 2MB / 2,500 rows per file. Larger files will use credit packs (coming soon). The pipeline-scale Data Engine is in development.