Excel tools
Convert CSV to Excel
Turn CSV files into a real XLSX workbook where numbers are numbers and dates are dates. Combine several CSVs into one workbook if you like.
How it works
Add one or more CSV, TSV or TXT files. The delimiter is detected, and values that look like numbers or dates are stored as real numbers and dates, so sorting, sums and charts work straight away. Several CSVs can go into one workbook, with a sheet for each file.
Why not just open the CSV in Excel?
Opening a CSV directly makes Excel guess the encoding and delimiter, and it often guesses wrong: accented letters turn into gibberish, or every row lands in column A. Converting first gives you an XLSX that opens correctly on any computer and is ready to save formatting, formulas and charts.
Leading zeros and long numbers stay intact
Values that start with a zero, such as ZIP codes, phone numbers or product IDs like 00123, are kept as text so the zeros survive. Numbers longer than 15 digits, like card or account numbers, are kept as text too, because Excel would round them.
Excel limits sheet names to 31 characters, so long file names are shortened when they become sheet names.
Your files stay on your device
CSV exports from banks, CRMs and shops are full of personal data. They're converted on your device and never uploaded. The work happens in your browser, so nothing is uploaded and nothing is stored on a server. Once the page has loaded it keeps working offline, and it's free, with no sign-up and no watermark.
Questions
Can I combine several CSV files into one Excel file?
Yes. Add all the CSVs and they can go into a single workbook, with each file as its own sheet. To stack the rows of several CSVs into one table instead, use Merge CSV first.
Will dates and numbers be recognised?
Yes. Values that look like numbers or dates are stored as typed cells, so you can sort and calculate with them in Excel right away.
Will my ZIP codes keep their leading zero?
Yes. Anything that starts with a zero, like 02134, is stored as text rather than a number, so Excel shows it exactly as it was in the CSV.
Does it work with semicolon or tab-separated files?
Yes. The delimiter is detected automatically, and TSV files are supported too.