I will build a browser tool to clean, compare and merge csv or excel files

Do you spend hours fixing messy CSV files, comparing two spreadsheets, or matching payments by hand?

I build a small tool that does it in one click, right in your browser.

What you get:

- A single HTML file. Double-click to open in Chrome, Edge or Safari (Windows / Mac)

- No install, no login, no server

- Your data never leaves your computer (the tool makes no network requests)

- Results saved to Excel or CSV

Examples of tools I have already built:

- Match bank deposits to an invoice list

- Show what changed between two Excel / CSV files (added, removed, edited rows)

- Clean customer lists: phone numbers, dates, emails, duplicates

- Turn survey or sales CSVs into tables and charts

How it works:

1. Tell me the task and send only the header row of your file (no real customer data needed)

2. I build and test the tool with dummy data

3. You get the tool and a short user guide

I use AI tools for parts of my work and personally review and test everything I deliver.