Excel Converter Free Online, No Signup
Drop an .xlsx or a .csv and get the other one back: sheets become clean delimited text, and CSV rows become a real workbook with typed cells. The conversion runs entirely in this tab.
Convert your spreadsheet
Drop a spreadsheet here
.xlsx or .csv — the direction is detected from the file
Files are processed on this device only. Nothing is uploaded.
Excel Converter — illustrated, step by step
How to convert a spreadsheet
Three steps, no accounts, no watermarks on the output.
Drop the file
Add an .xlsx to export a sheet as CSV, or a .csv to build a workbook. The controls adapt to the format.
Set the options
For XLSX, choose which sheet. For CSV, pick the delimiter, line endings and whether to add a byte-order mark.
Download
The converted file downloads with its exact weight shown. Nothing is uploaded anywhere.
Why convert in the browser?
Because spreadsheets hold the numbers you would least like on someone else's server. Converting locally means the file never leaves your device, there is no account and no queue, and the result is ready the moment the cells are read. Details are in our file-handling policy.
Troubleshooting
Is my spreadsheet uploaded?
No. The .xlsx is unzipped and its sheet XML read in this tab, and CSV files are parsed here too. There is no upload endpoint, so budgets, client lists and payroll data stay on your device.
Which direction does it convert?
Both. Drop an .xlsx and download a CSV of any sheet; drop a CSV and download an .xlsx with the same cells, ready to open in Excel, Sheets or Numbers. The mode is detected from the file you add.
What delimiter should I choose for CSV?
Comma is the universal default and what Excel expects. Semicolon suits European locales where the comma is the decimal separator, and tab is useful when the data itself contains commas — many spreadsheet apps accept all three on import.
Will special characters survive?
Yes. UTF-8 is the default encoding and covers every language. The optional byte-order mark helps older Excel versions recognize UTF-8 correctly, so enable it if accented or non-Latin characters arrive garbled.
How are numbers and dates written?
Exactly as the sheet stored them: numbers stay numeric without thousands separators, and text keeps its leading zeros because the cell is written as text in both directions. Formulas are converted to their saved results, since CSV has no formulas.
Why did my CSV open with everything in one column?
Because the delimiter did not match. If the file was saved with semicolons but opened as comma-separated, every row appears as a single cell — reopen it choosing the delimiter this page used, or re-download with comma.
Why CSV survives and formatting does not
CSV is the lowest common denominator of spreadsheet data, and that is precisely why it has outlived every proprietary format around it. A CSV file is a grid of text with something between the columns and something at the end of each row — nothing else. No types, no formulas, no styles, no sheets. That poverty is a feature: every language that has ever existed can read CSV in a few lines, which is why it remains the interchange format between systems that have never heard of each other.
The practical consequence is that the conversion is lossy in one direction only. Moving from XLSX to CSV discards everything but the saved values; moving back rebuilds a clean, typed grid — numbers as numbers, everything else as text — but not the workbook you started with. Keep the original file when the formatting matters, and use CSV when what you actually need is the data: an import for another system, a quick diff, a database load.
| Feature | XLSX → CSV | CSV → XLSX |
|---|---|---|
| Cell values | Kept | Kept |
| Leading zeros | Kept | Kept as text |
| Formulas | Saved results only | Values |
| Bold, colors, widths | Lost | Fresh workbook |
| Multiple sheets | One per file | Single sheet |
Beyond flat files
When the destination is a document rather than a data import, the same sheets can become pages: Excel to PDF lays every sheet out as a printable table.
For working with delimited text directly — merging files, splitting columns, cleaning rows — the CSV tools on this site handle the same parsing engine without a spreadsheet in the middle.
Need the sheets as a document?
Excel to PDF lays every sheet out as a printable table: same privacy, same speed.
Open Excel to PDF