Is converting Excel to CSV free?

Yes. Files up to 10MB convert free with no account. There is a limit of five conversions per day per IP address.

Will my Excel data keep its types in CSV?

Yes — that is the point. Whole numbers, decimals, dates and booleans are mapped to real CSV types rather than everything becoming text. The mapping table above shows exactly what you get.

Do you store my file?

No. The file is written to a temporary directory, converted, and the directory is deleted as soon as your download has been sent.

Convert Excel to CSV

Upload a .xlsx or .xls file and get back a CSV file. Types are preserved rather than flattened to text. Free, no registration, up to 10MB.

1Upload your file

Click to upload or drag and drop

CSV, Excel, SQLite, SQL, DBF (max 10 MB)

2Choose target format

How your data is typed in CSV

Generated from the converter's own CSV type mapping — this is what it actually emits, not an example.

Your data	CSV type
Whole number	text (CSV has no types)
Decimal (money)	text (CSV has no types)
Floating point	text (CSV has no types)
True / false	text (CSV has no types)
Date	text (CSV has no types)
Date and time	text (CSV has no types)
Short text	text (CSV has no types)
Long text	text (CSV has no types)
Binary data	text (CSV has no types)

Working from an Excel file

"Excel" covers two entirely different file formats, and which one you have decides how much type information survives the conversion. It is worth checking what your workbook was actually saved as before you upload it.

→Only .xls and .xlsx are recognised. A macro-enabled .xlsm, or a workbook saved as OpenDocument .ods, is refused before anything is read - save a copy as .xlsx first.
→The two extensions take different code paths inside the reader: .xlsx through openpyxl, .xls through pandas and xlrd, and they do not recover the same amount of information from the file.
→Sheet names become table names with every character outside letters, digits and underscores replaced one for one, so "Q1 Sales (2024)" arrives as Q1_Sales__2024: the space and the opening bracket each leave an underscore behind, and the trailing one is trimmed.

The shape of the CSV files you get

CSV is where the type information stops, so what is left to describe is the file itself: how a row is terminated, which fields are quoted, and how a value that used to have a type is spelled out as characters.

→Rows end with a carriage return and a line feed, the RFC 4180 ending, while a newline inside a quoted field stays the single character it always was. The encoding is UTF-8 with no byte-order mark in front of it.
→Quotes go on only where they are needed - a field holding a comma, a double quote or a newline - and a quote inside a field is doubled rather than escaped with a backslash. Every other field is written bare.
→Decimal values are written digit for digit and never through a floating-point number, so a money column that was exact in the source is still exact in the file. Booleans are written lower case, as true and false, which is the spelling this converter's own reader takes back as a boolean.

Reading Excel

→Numbers, dates and booleans are read as Excel stored them, never converted to text and re-parsed.
→Cell number formats are read out of .xlsx workbooks, so a column formatted as currency becomes a fixed-point decimal rather than a floating-point number — which is how money avoids acquiring a rounding tail. Legacy .xls is the exception: the xlrd path exposes no formats, so its currency columns come across as ordinary numbers.
→A column formatted as a date becomes a date, not a timestamp at midnight; one formatted with a time keeps its time.
→One sheet becomes one table. Empty sheets are skipped, and sheet names are sanitised for the target.

Writing CSV

→One file per table, with a header row.
→NULL is written as an empty field, never the word "None".
→Binary data is written as hex, which is reversible.

What you get

A ZIP containing <table>.csv. If anything about your data needed a judgement call, a _warnings.txt explains it.

Questions

Is converting Excel to CSV free?: Yes. Files up to 10MB convert free with no account. There is a limit of five conversions per day per IP address.
Will my Excel data keep its types in CSV?: Yes — that is the point. Whole numbers, decimals, dates and booleans are mapped to real CSV types rather than everything becoming text. The mapping table above shows exactly what you get.
Do you store my file?: No. The file is written to a temporary directory, converted, and the directory is deleted as soon as your download has been sent.