Excel Data Cleaning

The problem

Files that accumulate over time often contain duplicates, entry errors, inconsistent date or text formats, and mismatched columns across files — which makes any analysis on top of them unreliable.

The solution

I review the files, identify the sources of inconsistency, and clean and standardize the data in a traceable way, so it's ready for analysis or use in any other tool.

What I will do

• Data quality profiling and problem identification
• Deduplication and format standardization
• Handling missing or invalid values
• Consolidating multiple files into one consistent source (when needed)

What you get

• Consistently formatted data, free of duplicates
• Matching columns and data types across files
• Clear documentation of every change made to the original data
• A final file ready for analysis or import into any system

Deliverables

• A clean, standardized data file
• A change log documenting each cleaning step
• Notes on any data that couldn't be corrected with confidence

A simplified example

Illustrative sample data, not real client data.

When this service is a good fit

• When the business problem is directly related to Excel Data Cleaning.
• When the required data is available or can be provided as described below.
• When you need clear outputs that can support a decision or next step.

Requirements

• The original file(s) in Excel or CSV format
• Notes on which columns matter, or any known rules about the data (if any)

Scope & exclusions

• Data quality profiling and problem identification
• Deduplication and format standardization
• Handling missing or invalid values
• Consolidating multiple files into one consistent source (when needed)

Not included

• Does not include analyzing the data itself unless requested as part of another service
• Does not include correcting data that cannot be reliably verified

How the work is handled

1. Request reviewI review the problem and available data before confirming scope.
2. Scope confirmationWe confirm the required outputs and what is in scope.
3. Quote & timelinePrice and timeline are set based on the actual scope.
4. Execution & deliveryWork starts after agreement, followed by delivery of the agreed outputs.

Estimate your project scope

Pick what's closest to your case for an instant indicative range. This is a rough guide, not a final quote.

Estimated range — final price confirmed after reviewing the actual project scope.

Conversion is for convenience at an approximate rate, not a live exchange rate.

The timeline is confirmed after reviewing the scope of work and data size.

FAQ

Relevant proof

Data cleaning was a core part of the RFM Customer Segmentation project — you can review it as an example of the working methodology.