Convert CSV files to .xlsx spreadsheets with proper formatting. Runs in your browser.
Click to upload a CSV file or drag & drop
Accepts .csv files
A CSV file is just plain text with commas (or other separators) between values — it has no formulas, no cell formatting, and often looks messy when opened directly. Converting it to a proper .xlsx spreadsheet gives you a real Excel file you can format, sort, filter, and build formulas or pivot tables on top of.
This is especially useful when you've exported data from an accounting system, a database, or a web form, and need to turn that raw export into something presentable or ready for further analysis.
How do I know which delimiter to choose?
Most CSV files use commas, but files exported from European software or certain banking systems often use semicolons instead. If the preview looks like everything is in one column, try switching the delimiter.
Will formulas be added automatically?
No — this converts your raw data into spreadsheet format only. You can add formulas, formatting, and charts yourself once it's open in Excel or Google Sheets.
Can it handle very large CSV files?
Since everything is processed in your browser rather than on a server, very large files (well over 100,000 rows) may take a while depending on your device's performance.
Does the header row get any special formatting?
Yes — if you check "First row is header," that row is bolded in the resulting spreadsheet automatically.