Your spreadsheet has 847 problems.
We fix them in 0.3 seconds.
Stop manually finding duplicates, bad dates, and broken emails. SpreadsheetFix cleans your data instantly — right in your browser.
No sign-up required. Your data never leaves your browser.
Three steps to clean data
Upload
Drag and drop your CSV or Excel file. We auto-detect delimiters, encoding, and column types.
Review & Clean
See a health report of issues, choose cleaning rules, and preview every change before committing.
Export
Download your cleaned file as CSV or Excel, plus a change log showing exactly what was modified.
Everything you need to fix messy data
17+ cleaning rules, instant health reports, and full change tracking log.
Remove Duplicates
Exact match or by key columns. See exactly which rows were removed.
Normalize Dates
Detect mixed date formats and convert to a single standard (e.g. YYYY-MM-DD).
Fix Numbers
Remove currency symbols, fix comma vs dot decimals, strip thousands separators.
Validate Emails
Flag invalid email addresses. Quarantine rows for review instead of deleting.
Clean Headers
Normalize column names to lowercase_underscore, remove special characters.
Change Log
Every modification is tracked: what changed, which rule applied, original value.
Strip HTML
ProRemove HTML tags and entities from cell values. Clean copy-paste artifacts.
Phone Validation
ProDetect and format phone numbers to E.164 international standard.
Saved Presets
ProSave your favourite rule configurations and re-apply them to new files instantly.
Free tools for one-off fixes
Got one specific problem? Jump straight to the tool for it.
Remove Duplicates
Remove duplicate rows from a CSV
Normalize Dates
Normalize mixed date formats in a CSV
Validate Emails
Validate and clean email addresses in a CSV
Trim Whitespace
Trim whitespace and extra spaces in a CSV
Merge CSV Files
Merge multiple CSV files into one
CSV to Excel Cleaner
Clean a CSV and get an Excel-ready file
Fix CSV Encoding
Fix garbled characters and CSV encoding
Built for total privacy
Zero Data Upload
Processing runs securely in JavaScript in your browser. No file data touches our servers. Ever.
Instant Processing
No waiting for server uploads or queues. Files are parsed and cleaned locally at lightning speed.
GDPR Ready
Based in the EU. We only store account email and billing metadata. Full data rights included.