Change Case in Excel Online — Free, No Upload, 1 Click

How to Change Case in Excel Online

1. Drop one .xlsx, .xlsm, or .xls workbook — everything is processed locally and never uploaded.
2. Pick one of five modes: UPPER CASE, lower case, Proper Case, Sentence case, or tOGGLE cASE (lower case is the default).
3. Click Change case — every non-empty text cell on every sheet is converted.
4. Review the report — each sheet lists how many cells changed, with a grand total.
5. Download the result as your-file-name-case-changed.xlsx.

How It Works

This tool changes text case in Excel cells. Internally, it reads the .xlsx workbook (a ZIP of XML parts) in the browser, applies the selected case transformation (upper, lower, title case, sentence case, etc.) to each cell’s text value in place, then repackages the modified XML parts back into a fresh .xlsx. All local — no upload. Unicode-aware, so accented letters like é and Ñ are handled correctly.

Compared to UPPER / LOWER / PROPER

Excel offers UPPER(), LOWER() and PROPER() formulas for case changes, but each only does one transformation, needs a helper column, and doesn’t cover sentence case or title case properly (PROPER capitalizes every word, which isn’t always what you want). This tool applies the chosen case directly to the source cells, across the whole sheet, with multiple case modes.

The Five Case Modes at a Glance

The same cell content under each of the five modes:

Notice how Proper Case normalizes the acronym "USA-42" to "Usa-42": it capitalizes the first letter of every word and lowercases the rest, so consecutive capitals never survive.

When You Need This

• Name and address normalization: contact lists arrive as "JOHN SMITH" or "john smith"; Proper Case turns both into "John Smith" before a mail merge.
• Email address unification: the domain part of an email address is case-independent, so lowercasing the whole column removes duplicate-looking mixed-case addresses.
• Code and identifier fields: product SKUs, country codes, and enum values exported from different systems arrive in mixed case; UPPER or lower makes joins and lookups consistent.
• Free-text cleanup: comment columns exported in ALL CAPS become readable again with Sentence case.

Latin Letters Only — and Other Things to Know

Case conversion is designed for Latin-script text (English and other European languages). Chinese, Japanese, Korean, and other scripts without uppercase/lowercase pairs are returned unchanged, as are digits and punctuation. Proper Case treats every separator as a fresh word boundary, so abbreviations and acronyms are split apart: "NASA" becomes "Nasa" and "O'BRIEN-SMITH" becomes "O'Brien-Smith". If preserving acronyms matters, use the free online editor with targeted formulas instead.

What Is and Isn’t Changed

• Only non-empty text cells are touched. Numbers (0 stays 0), booleans, real dates, empty strings, and blank cells stay exactly as they are.
• Numeric-looking text such as "123" is still text; converting it produces the same "123", so it is not counted as a changed cell.
• Accented Latin letters are covered: é becomes É in UPPER mode and Ñ becomes ñ in lower mode.
• Sheets with zero matching cells report 0 changed; completely empty sheets are kept in the output.
• The output is a value-level .xlsx: styles, column widths, merged cells, and charts are simplified, and formulas land as their cached values.
• Encrypted workbooks (a password is required to open them) cannot be read.