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Excel ↔ CSV

Turn an Excel file into a CSV, or a CSV into a real Excel file that opens without any prompt. Both here in the browser, without Excel and without upload.

JavaScript is turned offThis tool works in your browser and needs JavaScript for that.

Choose an Excel file

or just drag it here.

XLSX · XLSM · UP TO 50 MB · STAYS ON YOUR DEVICE

Read

Visible rows onlyRows that are hidden or filtered out in Excel are dropped

Table

Output as

Delimiter

Character encoding

Decimal separator

Date format

Line ending

Choose a CSV file

or just drag it here.

CSV · TXT · TSV · UP TO 20 MB · STAYS ON YOUR DEVICE

Read

Delimiter

First row is the headerIt becomes bold, stays at the top when you scroll down and gets an autofilter

Read numbers as

Dates are recognized independently of this: DD.MM.YYYY or ISO (YYYY-MM-DD), both at the same time.

Autofilter on the headerArrows for filtering and sorting in Excel

Table

Text stays text if it begins with = + - @ (protection against formulas), has more than 15 digits or a leading zero.

More for tables: View, clean up and save CSV for Excel · Table as PDF

Your table stays on this device. Nothing is uploaded or saved.

How it works

01Choose the direction: load an Excel file and output it as a CSV, or load a CSV and output it as an Excel file.
02For Excel → CSV: choose the sheet, check the preview, set the output (delimiter, character encoding, decimal separator, date format, line ending).
03For CSV → Excel: the delimiter is detected, numbers and dates are recognized (not just saved as text), and the header becomes bold, frozen and gets an autofilter.

Excel → CSV. .xlsx and .xlsm are read. Old .xls files (the binary format from Excel 97 to 2003) are not understood by this page; save them once as .xlsx in Excel. A file encrypted with a password cannot be opened by this page either. The password would have to be removed in Excel first. Numbers are taken as Excel last saved them, without rounding errors from floating-point numbers. The page recognizes dates by the cell format and writes them into the CSV in the chosen format. Formulas show the last saved value, not the formula itself. If a file is opened without a saved value (this happens with some exports), the cell stays empty. Merged cells carry their value only in the first cell, the others stay empty, as in Excel. Up to 50 MB per file.

CSV → Excel. Numbers are read according to the chosen notation (German: 1.234,56 · English: 1,234.56) and saved as real numbers so that you can calculate with them in Excel. Dates (DD.MM.YYYY or ISO) become a real Excel date. Text that looks like a leading zero (01067), a very long digit sequence (more than 15 digits, such as account numbers) or a formula (starts with =, +, - or @) deliberately stays text. The four formula characters also get the same protection that Excel uses for “force as text”, so that they never turn into an executed formula. The file that is created is a validly built .xlsx (with all the internals Excel expects) and opens without a “Repair” message.

Limits. Cell colors, borders, charts, images and conditional formatting are lost in both directions. Only values, formulas as values and (for CSV → Excel) bold type, autofilter and frozen header stay. Excel itself already loses numbers with more than 15 digits when saving; this page does not change that. Nothing is calculated: formulas are never evaluated again.