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TheSpreadFix

Excel Cleaner

Clean .xlsx spreadsheets without formulas or macros. TheSpreadFix finds duplicates, formatting problems and invalid values across your sheet, lets you fix them in a few clicks, and gives you a clean Excel or CSV file back.

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

    Open your workbook

    Drop an .xlsx file. Pick the sheet if there's more than one; blank rows above the header are skipped automatically.

  2. Step 2

    See what needs fixing

    The Data Health Report explains every problem in plain language, with examples from your sheet.

  3. Step 3

    Download a clean file

    Get a new .xlsx (or CSV). Phone numbers and codes with leading zeros stay as text, so Excel won't mangle them.

What it checks and fixes

Header and layout issues

Blank rows above the table, blank or duplicate column names, and data that starts in column B or C.

Numbers stored inconsistently

Columns that are mostly numbers but contain text such as “N/A” or “ten”, which break formulas, pivots and imports.

Capitalisation and spacing

Names in ALL CAPS or all lowercase, and invisible leading or trailing spaces that stop VLOOKUP/XLOOKUP from matching.

Dates, phones, emails and countries

Several date formats in one column, phone numbers written many ways, messy emails and country spellings — standardised consistently.

Cleaning Excel data without formulas

The usual Excel approach — TRIM(), PROPER(), LOWER(), helper columns, Remove Duplicates and Text to Columns — works, but it's slow, easy to get wrong, and has to be rebuilt every time a new export arrives. Helper columns also have to be copied and pasted as values before you can delete the originals.

TheSpreadFix replaces those steps with a report and a checklist: you see what's wrong across the whole sheet at once, choose fixes, and download a clean copy. The fixes can be saved as a recipe and re-applied to next week's workbook.

How Excel silently changes your data — and how to avoid it

Excel tries to be helpful when it opens files, which can quietly corrupt data:

  • Leading zeros disappear from PIN codes, ZIP codes and product codes (00123 becomes 123).
  • Long numbers such as card or account numbers become scientific notation and lose digits after the 15th.
  • Phone numbers starting with + are treated as formulas or numbers.
  • Text that looks like a date (e.g. 3-4) is converted into a date.

In the Excel files you download from TheSpreadFix, only plain numbers without leading zeros are stored as numbers. Everything else — codes, IDs, phone numbers — is stored as text, so it looks exactly the way it should.

Careful capitalisation

PROPER() in Excel turns “McDonald” into “Mcdonald” and “O'BRIEN” into “O'Brien” but also “don't” into “Don'T”. TheSpreadFix only converts values that are entirely upper or lower case, leaves deliberately mixed-case names alone, and handles apostrophes sensibly (O'Brien, D'Souza, Don't).

Workbooks with several sheets, titles and formulas

If your workbook has several sheets, choose the one to clean after uploading. Blank rows above the table and empty leading columns are skipped automatically; if the sheet has a title row above the headers, delete it first so the real header row is used. Formulas are read as their last calculated values — what you want in a clean data file — and your original workbook is never changed.

Frequently asked questions

Does it support .xls files?

Not directly. Open the file in Excel and use File → Save As → Excel Workbook (.xlsx), then upload the .xlsx.

What happens to formulas?

Each cell's last calculated value is used. The cleaned file contains values, not formulas.

My workbook has several sheets. Which one is cleaned?

The first sheet by default. If the workbook has more than one sheet you can switch sheets after uploading.

Will leading zeros be preserved?

Yes. Values like 00123 are kept as text in the downloaded workbook. Only plain numbers without leading zeros are written as numbers.

Will my colours and formatting be kept?

No — the download is a clean data file. Values are preserved; cell colours, merged cells and formulas are not.

Is my workbook uploaded?

Not when you use the free cleaner: the workbook is read in your browser. Saving to a workspace is optional and requires an account.