# Convert CSV to XLSX

> Convert CSV to XLSX online for free in seconds. Files are processed in a secure, isolated sandbox and deleted automatically. No sign-up, no watermarks.

URL: https://www.converterrr.com/csv-to-xlsx

- Runs in an isolated cloud sandbox with LibreOffice: files are deleted automatically, and the job uses cloud credits.
- Engines: LibreOffice (cloud).
- API: available. `POST /api/v1/jobs` with `"output_format": "xlsx"` (paid plans).
- More: [Spreadsheet converter](https://www.converterrr.com/spreadsheet-converter), [CSV converter](https://www.converterrr.com/csv-converter).

## How to convert CSV to XLSX

1. **Add your CSV files.** Drag and drop CSV files onto the converter, paste them, or click to browse. You can add several at once.
2. **Choose XLSX.** XLSX is already selected. Open Options if you want to change quality, size or metadata.
3. **Convert.** Click Convert. Files are processed in a secure cloud sandbox and are usually ready in seconds.
4. **Download your XLSX.** Download each XLSX file, or everything at once as a ZIP.

## Good to know

- CSV files are typically used for data exchange between spreadsheets, databases and apps, while XLSX is best for spreadsheets in Excel, Google Sheets and Numbers.
- This conversion runs on LibreOffice in an isolated cloud sandbox. Files are encrypted in transit and deleted automatically.

## CSV vs XLSX

|  | CSV | XLSX |
| --- | --- | --- |
| Full name | Comma-Separated Values | Microsoft Excel Workbook |
| Type | Spreadsheet | Spreadsheet |
| Extensions | .csv | .xlsx |
| MIME type | text/csv | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |
| Best for | data exchange between spreadsheets, databases and apps | spreadsheets in Excel, Google Sheets and Numbers |
| Properties | open standard | open standard |

**CSV:** CSV is plain-text tabular data with values separated by commas — the universal import/export format for spreadsheets and databases.

**XLSX:** XLSX is the modern Excel workbook format with formulas, multiple sheets, charts and formatting.

The other way around: [convert XLSX to CSV](https://www.converterrr.com/xlsx-to-csv).

## Related conversions

- [XLSX to CSV](https://www.converterrr.com/xlsx-to-csv) (cloud)
- [CSV to PDF](https://www.converterrr.com/csv-to-pdf) (cloud)
- [CSV to DOCX](https://www.converterrr.com/csv-to-docx) (in the browser)
- [XLS to XLSX](https://www.converterrr.com/xls-to-xlsx) (cloud)
- [ODS to XLSX](https://www.converterrr.com/ods-to-xlsx) (cloud)
- [CSV to EPUB](https://www.converterrr.com/csv-to-epub) (in the browser)
- [Numbers to XLSX](https://www.converterrr.com/numbers-to-xlsx) (cloud)
- [CSV to TXT](https://www.converterrr.com/csv-to-txt) (in the browser)
- [TSV to XLSX](https://www.converterrr.com/tsv-to-xlsx) (cloud)
- [CSV to HTML](https://www.converterrr.com/csv-to-html) (in the browser)
- [CSV to Markdown](https://www.converterrr.com/csv-to-md) (in the browser)
- [CSV to XLS](https://www.converterrr.com/csv-to-xls) (cloud)

## Convert CSV to other formats

[CSV to PDF](https://www.converterrr.com/csv-to-pdf), [CSV to DOCX](https://www.converterrr.com/csv-to-docx), [CSV to EPUB](https://www.converterrr.com/csv-to-epub), [CSV to TXT](https://www.converterrr.com/csv-to-txt), [CSV to HTML](https://www.converterrr.com/csv-to-html), [CSV to Markdown](https://www.converterrr.com/csv-to-md), [CSV to XLS](https://www.converterrr.com/csv-to-xls), [CSV to ODT](https://www.converterrr.com/csv-to-odt), [CSV to RTF](https://www.converterrr.com/csv-to-rtf), [CSV to ODS](https://www.converterrr.com/csv-to-ods), [CSV to LaTeX](https://www.converterrr.com/csv-to-tex), [CSV to IPYNB](https://www.converterrr.com/csv-to-ipynb), [CSV to FB2](https://www.converterrr.com/csv-to-fb2), [CSV to TSV](https://www.converterrr.com/csv-to-tsv), [CSV to reST](https://www.converterrr.com/csv-to-rst), [CSV to Typst](https://www.converterrr.com/csv-to-typ), [CSV to AsciiDoc](https://www.converterrr.com/csv-to-adoc), [CSV to Org](https://www.converterrr.com/csv-to-org), [CSV to MediaWiki](https://www.converterrr.com/csv-to-wiki), [CSV to OPML](https://www.converterrr.com/csv-to-opml), [CSV to DocBook](https://www.converterrr.com/csv-to-docbook), [CSV to Textile](https://www.converterrr.com/csv-to-textile), [CSV to JATS](https://www.converterrr.com/csv-to-jats), [CSV to Man](https://www.converterrr.com/csv-to-man)

## Convert other formats to XLSX

[XLS to XLSX](https://www.converterrr.com/xls-to-xlsx), [ODS to XLSX](https://www.converterrr.com/ods-to-xlsx), [Numbers to XLSX](https://www.converterrr.com/numbers-to-xlsx), [TSV to XLSX](https://www.converterrr.com/tsv-to-xlsx)

## CSV to XLSX: frequently asked questions

### How do I convert CSV to XLSX?

Drop your CSV file onto the converter above, make sure XLSX is selected, and click Convert. When it's done, download the XLSX file — it usually takes a few seconds.

### Is it safe to convert CSV to XLSX here?

Yes. Your file is sent over an encrypted connection to an isolated sandbox that's created for your job only, then both the original and the result are deleted automatically.

### Is the CSV to XLSX converter free?

Yes. Cloud conversions like this one use credits, and you get free credits every day (3 without an account, 10 with a free account).

### Will converting CSV to XLSX reduce quality?

No — XLSX preserves the content of your CSV file as faithfully as the format allows.

### Can I convert multiple CSV files at once?

Yes. Add up to 5 files at a time without an account, 10 with a free account and up to 500 on paid plans, then download them individually or as a single ZIP.

### Can I convert XLSX back to CSV?

Yes — use our XLSX to CSV converter. Note that converting back and forth between formats can't recover detail lost to lossy compression.