CSV to Excel Converter
Opening a raw CSV in Excel often breaks dates, drops leading zeros and jams everything into one column depending on your regional separator. Converting to a proper XLSX workbook first means the file opens cleanly on any machine, on any locale.
Runs in your browser — the file is never uploaded
Drop any file to begin
Images · Documents · Data · Audio · Video — processed locally in your browser
How to convert CSV to XLSX
- 1Drop your .csv file onto the converter above.
- 2Choose XLSX as the output format.
- 3Convert and open the workbook in Excel, Numbers or Google Sheets.
Things worth knowing
- Commas, semicolons and tabs are detected automatically.
- Quoted fields containing commas or newlines are kept intact.
CSV to XLSX — frequently asked questions
Will my ID and postcode columns stay intact?
Yes. Values that look numeric but start with a zero are written as text, so 00123 stays 00123 instead of becoming 123.
Are my files uploaded to a server?
No. AllConverter runs the whole conversion inside your browser tab using WebAssembly and the Canvas API. Your file never travels over the network, which you can confirm by watching your browser's Network tab while you convert.
Is there a file size or daily limit?
There is no daily cap and no account. The only practical limit is your device's memory, since the file is processed locally — very large videos are the one case where a desktop browser handles the job far better than a phone.