CSV Cleaner & Merger combines multiple CSV files into one clean output file, with the cleanup and matching logic built in so you don't have to do it by hand in a spreadsheet. Import and match columns Bring in as many CSV files as you need, even if their column headers don't match exactly. The app auto-matches similar headers across files and shows you where a column is missing data, so you can fix mismatches before you merge instead of after. Two ways to combine files Append stacks every file's rows into one long list. Match & combine joins files on a key column (like a customer ID or order number), the way a database join works — with Inner, Left, Right, and Full Outer options depending on which rows you want to keep. Clean your data as you go Apply cleaning to every column or just one: trim whitespace, normalize text case, and standardize dates, times, and numbers into a consistent format (including currency and percentages). Remove duplicate rows by key column, filter rows down to what you need, and sort the output — all with a live preview before you save. Reuse your setup Save a column mapping, join settings, and cleaning rules as a template, then re-run it on next week's files in one click. Local and private Your files are never uploaded anywhere. Everything — import, cleaning, merging, and export — happens on your PC. Export to CSV or Excel (XLSX). Pricing This is a one-time purchase, not a subscription. Try the full app free for 14 days; after that, buy it once through the Microsoft Store to keep using it.