Excel to CSV

How Excel to CSV works

Convert the first sheet of an Excel file into clean CSV. Reads .xlsx, .xls and .csv locally and exports the first sheet as CSV you can paste anywhere. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

First sheet only

The workbook is read with SheetJS and the first sheet is exported as CSV. Other sheets are ignored, which catches people out on a file where the data moved to sheet 2.

That single-sheet rule is deliberate: a CSV has no concept of tabs, so exporting several sheets into one file would silently merge unrelated tables.

What survives and what does not

Cell values survive. Formulas are exported as their last computed value, because CSV stores text. Formatting, colours, merged cells, comments and charts are lost.

Merged cells are the usual source of surprise: a merged header becomes a value in the first cell and empty strings in the rest.

Encoding

The output is UTF-8. Excel on Windows may misread non-ASCII text unless you import the file rather than double-clicking it — the import dialog lets you choose UTF-8 explicitly.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions