Convert CSV to Excel
Turn a CSV into a real Excel workbook. Numbers become numbers, codes like 007 keep their leading zeros, and the delimiter is detected for you.
Free forever · Runs on your device · 0 bytes uploaded
Speed depends on your device; big files on phones take longer. Slow or not working? Report it on GitHub
How to cSV to Excel
- Add one .csv file.
- Click “Convert to Excel”.
- Download the .xlsx.
Also good for
- open CSV in Excel correctly
- CSV to XLSX free
- keep leading zeros in CSV
- convert CSV to spreadsheet
- CSV to Excel on phone
Private by design — and you can check
Your files are never uploaded, because there is nowhere to upload them to.
- No upload step existsFiles are read and written inside this browser tab. There is no server that could receive them.
- The browser enforces itThis page’s Content Security Policy only allows connections back to this site, which serves nothing but the app itself.
- See for yourselfOpen developer tools, watch the Network tab and run a job: no request carries your document.
- Open sourceEvery line is on GitHub, built on qpdf, pdf.js & pdf-lib.
Frequently asked questions
Are my files uploaded anywhere?
No. Fizzdoc does the work inside your browser tab, using open-source engines compiled to WebAssembly and JavaScript. Your file is read from your device, processed locally, and the result is saved straight back to your device. You can check this yourself: open your browser’s developer tools, go to the Network tab, and run a job — no request carries your file.
Does it handle semicolons and tabs?
Yes. Commas, semicolons, tabs and pipes are detected automatically, as are quoted fields with line breaks inside them.
Is Fizzdoc free?
Yes, and it stays free: no sign-up, no watermark, no daily limit and no premium tier. Fizzdoc is open source under the Apache-2.0 license, so anyone can run their own copy.
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