Free · no install · nothing uploads
Excel formatter
Drop in a workbook and get a formatted one back. No add-in to install, no account, and the file is never uploaded — it is read and rewritten in this browser.
The file itself is never uploaded. Parsing, formatting and the .xlsx download all happen in this browser.
What “formatting” actually means here
Most tools that claim to format Excel either generate a formula for you or ask you to install an add-in and then apply a style gallery. Neither fixes the things that make a sheet look unfinished: headers that still read unit_price, currency columns left-aligned as text, a missing totals row, and columns too narrow to show their own contents.
SuperSheet works from the structure of your sheet. It infers a type for every column, then applies the treatment that type deserves — thousands separators and right alignment on numbers, an accounting-style format on currency, a real date format on dates, and a frozen header row so the labels stay put while you scroll. The result is written as native Excel formatting, so it keeps working after you edit it.
It proposes before it changes anything
Every change appears as a proposal you can untick. If your “ID” column happens to be numeric, you do not want it summed — so uncheck the totals row for it and apply the rest. Nothing is written to your file until you press apply, and the original file on your disk is never modified at all: you get a new download.
Once the sheet is formatted, the chat rail takes plain-English requests: switch themes, rename a header, sort by a column. Edits arrive as a pending change with accept and reject buttons, so a bad suggestion costs you one click.
Where it fits
If your file is mostly clean and you want it to look finished, this page is the right one. If it is genuinely messy — merged cells, numbers stored as text, stray whitespace — start with the spreadsheet cleaner, which leads with those repairs. Coming from a raw export? CSV to Excel converts and formats in the same pass.
Frequently asked questions
- Does this change my original file?
- No. Your file is read into the browser and never modified. Applying a plan produces a new .xlsx that you download; the original stays exactly as it was on disk.
- Do the formulas still work in Excel?
- Yes. The totals row is written as real SUM formulas over the data range, so it recalculates when you change the numbers. Number formats, freeze panes and conditional formatting are all written as native Excel features.
- Is there a file size limit?
- Files up to 15 MB, and SuperSheet works with the first 5,000 rows of a sheet. Formatting is structural, so wide sheets format correctly regardless of row count.
- Do I need Excel installed?
- No. The formatter runs in the browser. You do need something to open the result — Excel, Google Sheets, Numbers or LibreOffice all read the .xlsx it produces.