CSV Cleaner

About CSV Cleaner & Data Sanitizer

CSV Cleaner is a powerful online tool that automatically sanitizes and cleans your CSV and JSON data files. Remove empty rows and columns, trim whitespace, strip special characters, eliminate duplicates, and normalize formatting—all in your browser without uploading data to a server.

What does CSV Cleaner do?

CSV Cleaner sanitizes data by removing empty rows and columns, trimming whitespace, stripping non-printable characters, eliminating duplicate rows, and normalizing line breaks. It helps prepare messy data for analysis, import, or further processing.

Is my data secure?

Yes. All data cleaning happens locally in your browser using JavaScript. Your files never leave your device, ensuring complete privacy for sensitive information like customer lists, financial records, or confidential datasets.

What file formats are supported?

CSV Cleaner supports CSV files (with various delimiters: comma, semicolon, tab, pipe) and JSON files (arrays of objects). Both formats can be cleaned and exported to either CSV or JSON format after processing.

What does 'Remove special characters' do?

This option strips non-printable and control characters from your data, keeping only standard ASCII characters (letters, numbers, basic punctuation). It's useful for cleaning data imported from legacy systems or databases that may contain hidden formatting characters.

How are duplicate rows detected?

Duplicate rows are identified by comparing all column values in each row. If two or more rows have identical values in all columns, only the first occurrence is kept. This helps eliminate redundant data entries.

Can I preview the cleaned data?

Yes. The tool displays a preview of your cleaned data (up to 100 rows) in a table format. You'll also see a detailed cleaning report showing how many empty rows, empty columns, duplicates, and cells were cleaned.