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TheSpreadFix

Remove Duplicates from Excel

Excel's built-in Remove Duplicates keeps the first row and deletes the rest without showing you what went. TheSpreadFix shows exactly which rows are duplicates, lets you choose which one to keep, and never touches your original workbook.

Drop a CSV or Excel file here

.csv, .xlsx, .tsv

Your file stays on your device. It's read and cleaned in your browser — nothing is uploaded.

How it works

  1. Step 1

    Upload the .xlsx

    Choose the sheet; blank rows above the header are skipped automatically.

  2. Step 2

    Pick key columns

    Match on whole rows, or on email, customer ID, SKU — or several columns together.

  3. Step 3

    Review & download

    See the removed rows, then download a new Excel file or CSV.

What it checks and fixes

Hidden duplicates

Duplicates Excel misses because of trailing spaces or different capitalisation.

Duplicate keys

Repeated customer IDs, SKUs, order numbers or emails, reported per column with examples.

Empty rows

Blank rows left behind by filtering and copy-paste, removed in the same pass.

Survivor choice

Keep the first, last or most complete record — not just whichever happens to be on top.

Why Excel's Remove Duplicates misses duplicates

Data → Remove Duplicates ignores capital letters but compares everything else exactly. “Ravi Kumar” and “Ravi Kumar ” (trailing space) — or an email with a non-breaking space pasted from a web page — are different values to Excel. The duplicates survive, and you don't find out until an import or a mail merge goes wrong.

It also gives you no record of what it deleted — just a count. If the wrong rows were removed, the only way back is Undo.

A safer way to remove duplicates from a spreadsheet

  1. Trim spaces and standardise case in the columns you'll match on.
  2. Decide which column really identifies a record — usually email or an ID.
  3. Choose which copy to keep: first, last or most complete.
  4. Review the rows that will be removed before saving.
  5. Keep the original file untouched in case you need to go back.

TheSpreadFix does all five in one flow.

Doing it in Excel instead

If you prefer to stay in Excel, flag duplicates first rather than deleting them: add a helper column with =TRIM(LOWER(B2)) for the key, then =COUNTIF($C$2:C2,C2)>1 to mark every repeat after the first. Filter on TRUE to review, then delete. In Excel 365, =UNIQUE(range) returns a de-duplicated copy without touching the source. See our step-by-step guide linked below for details.

Frequently asked questions

Does it remove duplicates across multiple sheets?

One sheet at a time today. Merging several files or sheets is planned.

Will my formatting be kept?

The download is a clean data file: values are preserved but cell colours, formulas and merged cells are not.

Can I undo?

Your original file is never changed, so you can always start again. You can also go back and adjust your choices before downloading.

How many rows can it handle?

The browser cleaner reads large workbooks; free downloads are limited to 500 rows until paid plans launch.