Free · No sign-up · Runs in your browser
Find and Fix Spreadsheet Problems in Seconds.
Clean your Excel and CSV files, detect hidden data issues, and get organized spreadsheets without complicated software.
Your file is read by your browser on this device. It is not uploaded to our servers.
Common problems
What can you fix?
MyDataFixer looks for the issues that most often cause wrong totals, failed imports and messy reports.
Duplicate Rows
Find rows that appear more than once and keep a single copy, so totals and counts stay accurate.
Missing Data
Spot blank cells, empty rows and unused columns that break formulas, imports and reports.
Formatting Problems
Fix extra spaces, inconsistent capitalization and dates written in several different formats.
Invalid Values
Catch malformed email addresses, odd phone numbers, numbers stored as text and unusual outliers.
Formula Errors
See cells showing errors such as #N/A, #DIV/0! or #REF! so you can trace them back to the source.
CSV Import Problems
Detect wrong delimiters, broken quoting, uneven rows and duplicate headers before an import fails.
Free tools
Popular tools
Pick the tool that matches your problem. Each one works on its own, with no account.
- Spreadsheet Error DetectorScan Excel or CSV files for duplicates, blanks, bad dates, invalid emails and more.Accepts XLSX, XLS, CSV
- Spreadsheet CleanerRemove duplicates, trim spaces, fix capitalization and dates, edit cells, with undo and download.Accepts XLSX, XLS, CSV
- CSV ValidatorCheck CSV structure (headers, row lengths, quotes, separators, encoding) and repair problems with a preview.Accepts CSV, TSV, TXT
- Excel to CSV ConverterDownload a worksheet from an XLSX or XLS workbook as CSV, or every sheet at once as a ZIP.Accepts XLSX, XLS
Also available: CSV to Excel Converter
How it works
Four steps to cleaner data
No installation and no learning curve. If you can open a spreadsheet, you can use MyDataFixer.
Step 1: Open your spreadsheet
Choose an XLSX, XLS or CSV file. Your browser opens it on your device; nothing is uploaded.
Step 2: Detect problems
MyDataFixer scans every row and column for common data issues.
Step 3: Review suggested fixes
See exactly which cells are affected, preview every fix before it is applied, and undo any change.
Step 4: Download your corrected file
Get a clean copy. Your original file is never modified.
Why MyDataFixer?
Built for real people with real spreadsheets
Students, office teams, freelancers, accountants and business owners use spreadsheets every day. MyDataFixer makes fixing them quick and safe.
Free tools
Every tool is free to use, with no trial period or usage credits.
Simple interface
Plain-language results designed for people who are not data experts.
Browser-based processing
Files are read and processed on your own device instead of being uploaded to a server.
No mandatory registration
No account, email address or sign-up needed to use any tool.
Preview before applying
Every change is shown before it is applied, and nothing is changed silently.
FAQ
Frequently asked questions
Is MyDataFixer really free?
Yes. All tools on MyDataFixer are free to use and do not require an account. There are no paid plans or hidden limits on the number of files you can check.
Are my files uploaded to a server?
No. MyDataFixer reads and processes your spreadsheet inside your web browser using JavaScript running on your device. The file contents are not sent to our servers or to any third-party service.
Which file formats are supported?
You can open Excel workbooks (.xlsx and the older .xls format) and CSV files; the CSV Validator and the CSV to Excel converter also accept .tsv and .txt files. Files up to 150 MB are accepted. Because processing happens on your device, very large files can be slow, and on phones or older computers they may need more memory than the browser allows.
Will MyDataFixer change my original file?
Never. Your original file stays exactly as it is on your device. MyDataFixer works on a copy in memory and only creates a new file when you choose to download the result.
Can it fix formulas?
MyDataFixer points out cells that show formula errors such as #N/A or #DIV/0!, but it does not rewrite formulas for you. Automatic fixes never change formula cells, and formulas are never executed as code. When you download an Excel file, the formulas you didn't edit are kept.
Does it work on phones and tablets?
MyDataFixer is tested in Chrome and other Chromium-based browsers (such as Edge, Samsung Internet and Brave) on Android phones and tablets and on desktop computers. Other modern browsers should work, but they have not been tested yet. Very large files need a computer or a recent phone with enough memory, and are easier to review on a bigger screen.