Add Text to Excel Cells Online — Free, No Upload, 1 Click

How to Add a Prefix or Suffix to Excel Cells Online

1. Drop one .xlsx, .xlsm, or .xls workbook — everything is processed locally and never uploaded.
2. Type a prefix, a suffix, or both — leave the other box empty when you only need one side.
3. Keep “Only change text cells” on (the default) to leave numbers, dates, and booleans untouched; turn it off to convert them to text and wrap them as well.
4. Choose whether the first row is a header — with it on (the default), header cells are never changed.
5. Click Add text — every sheet is processed, then download the result as your-file-name-with-text.xlsx.

Prefix, Suffix, or Both: What Each Does

When You Need This

• Adding a currency symbol such as $ or € in front of every price.
• Numbering rows with a prefix such as 001-, NO.-, or [A].
• Completing domains or links by wrapping names with https:// and .com.
• Batch-tagging labels, categories, or campaign codes with a shared prefix or suffix.

Text Cells Only vs. Every Value

By default only text cells change. Numbers stay numeric, so SUM and other formulas keep working; dates stay real dates and booleans stay TRUE/FALSE.

Turn “Only change text cells” off to stringify every non-empty value before adding text: 123 becomes “123”, TRUE becomes “true”, and dates are rendered as English date strings (such as Mon Jan 15 2024 00:00:00 GMT+0000) — the exact text depends on your browser’s time zone. These cells become plain text and can no longer be used in numeric formulas. The output is a value-level .xlsx rebuilt from your data, so cell styles, merged cells, and charts are simplified; use the online editor when formatting must be preserved.

Empty Cells Are Never Changed

Truly empty cells — null, undefined, or an empty string — are never touched, so blank space is never turned into a prefix-only fragment.

A cell containing only spaces (such as “ ”) is a non-empty text cell: it IS wrapped, becoming, for example, “# ”. If you want whitespace-only cells left alone or cleaned first, run the trim-whitespace tool before this one.

Limitations

• The same prefix and suffix apply to every matching cell in every sheet — different text per column is not supported here; use the online editor for that.
• When “text cells only” is off, dates are stringified in the browser’s English date format, not the workbook’s display format.
• Styles, formulas, merged cells, and charts are simplified in the output file.
• Encrypted workbooks (a password is required to open) cannot be read.
• Legacy .xls files are supported, but are converted to .xlsx on output.