Free Excel to CSV Converter & Data Cleaner: Remove Duplicates Online
The All-in-One Data Cleaning Tool
Data Transformer is the professional way to clean, validate, and convert messy spreadsheets instantly. Whether you are trying to convert Excel to CSV, remove duplicate rows, or validate email lists, this tool acts as your personal data firewall.
✨ Excel to CSV Converter
Upload .xlsx or .xls files directly. We convert them to a clean, standard CSV format ready for import into any software.
🗑 Remove Duplicate Rows
Don't pay for duplicates in your marketing list. Click the "Remove Dupes" button to instantly scan and delete identical rows.
⚡ Auto-Fix Errors
One click to strip text from number columns, fix email formatting, and standardizes boolean values (Yes/No to True/False).
🔒 100% Private & Secure
We are a "client-side" tool. Your sensitive customer data never leaves your browser and is never stored on our servers.
Why use Data Transformer?
Bad data costs money. If you upload a messy file to tools like Salesforce, HubSpot, or Mailchimp, it can ruin your segmentation or cause account suspensions.
By using our Auto-Fix and Validation features, you guarantee that the output file is always formatted correctly, removing the risk of "bad data" polluting your systems.
Frequently Asked Questions
How do I remove duplicate rows from Excel online?
Simply upload your file above. Click the "Remove Dupes" button in the toolbar. The tool will scan every row and keep only the unique entries, allowing you to download a clean list.
Can I convert Excel (.xlsx) to CSV?
Yes. This tool supports standard CSV files as well as binary Excel data. The final download will always be a universally compatible, UTF-8 encoded CSV file.
Is this tool free?
Yes, this is a free utility for validating and cleaning data. We help developers and non-technical users alike save hours of manual checking in Excel.
Free Excel to CSV Converter & Data Cleaner: Remove Duplicates Online
The Professional Data Cleaning Tool
Data Transformer is the fastest way to clean, validate, and convert messy spreadsheets in your browser. Whether you need to convert Excel to CSV for a software import, remove duplicate rows from a mailing list, or validate messy data, this tool acts as your personal data firewall.
✨ Excel to CSV Converter
Upload .xlsx or .xls files directly. We convert binary Excel data into a clean, standard UTF-8 CSV format ready for any database.
🗑 Remove Duplicate Rows
Clean your data instantly. Click the "Remove Dupes" button to scan thousands of rows and delete identical entries automatically.
⚡ Auto-Fix Errors
One click to strip text from number columns, fix email formatting, and standardize boolean values (Yes/No to True/False).
🔒 100% Private & Secure
We use Client-Side processing. Your sensitive data (financials, customer lists) never leaves your browser and is never stored on our servers.
Why use Data Transformer?
Bad data breaks software. If you try to upload a messy Excel file to Salesforce, QuickBooks, Shopify, or Mailchimp, it will often be rejected due to formatting errors or hidden characters.
Instead of spending hours manually checking rows in Excel, use our Auto-Fix and Validation engine. We flag errors in red and provide tools to repair them instantly, ensuring your file import works the first time.
Frequently Asked Questions
How do I remove duplicate rows from Excel online?
Simply upload your file to the Data Transformer above. Click the "Remove Dupes" button in the toolbar. The tool will scan every row for exact matches and keep only the unique entries, allowing you to download a clean, deduplicated list.
Can I convert Excel (.xlsx) to CSV?
Yes. This tool functions as a robust Excel to CSV converter. It supports standard CSV files as well as binary Excel sheets (.xlsx, .xls). The final download will always be a universally compatible CSV file.
Is this data cleaner free?
Yes, this is a free utility for validating and cleaning data. We help developers, marketers, and data analysts save hours of manual work without needing to install heavy software.