Free Online Data Cleaning Service

Your data cleanup tool for formatting and cleaning
Excel spreadsheet tables and CSV files
In just a few minutes, with no sign-up required!
Get structured and error-free dataframes, ready for data analysis

Well-normalised dataframe

Correct formats, types, and value ranges

Detect missing values and anomalies

Catch near duplicates

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Drag & Drop or Click to Upload your File

Allowed format: .xlsx, .csv only
Maximum size: 100kB (~1k rows with ~10 columns)
Note: Only the active spreadsheet is processed. Excel formulas are not considered for now.

Discover What CleanMyExcel Can Do

Our model reads and understands your spreadsheets
We apply a smart sequence of data cleansing operations to prepare your files for analysis.

Spreadsheet Table Detection and Structure Analysis

Detects how many tables are present and where they're located.
Determines the boundaries of each table (e.g., empty rows/columns, specific markers).
Identifies headers, including multi-level headers where present.
Handles merged cells intelligently based on context.

Excel Table Formatting

Your data is reformatted into clean, well-structured tables with clear schema (columns and rows) following tidy data best practices.

Spreadsheet Normalization

Automatically assign appropriate data types to each column using statistical and semantic inference.

Spreadsheet Data Validation and Error Correction

Audit your data quality to spot inconsistencies, and automatically fix errors.

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