Free tool
Online Data Cleaner
Fix the boring problems in one pass — stray spaces, duplicate rows, empty columns, inconsistent headers and number formats — then download the clean file.
Updated September 20, 2026
Files are read in your browser. Only a small aggregated summary is sent when you ask for AI analysis.
How to use the Data Cleaner
- Load the file: Upload or paste CSV, or open an Excel file. Everything runs in your browser.
- Choose the fixes: Toggle trimming, duplicate removal, empty row and column removal, header tidying and number normalisation.
- Download the result: Export the cleaned data as CSV, or continue working on it in the GridMind workspace.
What people use it for
- Preparing an export for Power BI or a database import
- Fixing files where numbers are stored as text
- Removing duplicate records before a count
- Normalising column names before joining two files
Frequently asked questions
Does cleaning change my original file?
No. Your file is never modified; you download a new cleaned copy.
What counts as a duplicate row?
A row whose values match another row exactly across every column after trimming.
Can I undo a fix?
Yes. Toggle it off and the result is recalculated from the original data.
Related tools and guides
Analyze your data with AI
Open the GridMind workspace, bring in a CSV, Excel file or your Power BI model, and let AI build the formulas, charts and dashboards for you.