CSV to XLSX conversion in the browser
Convert CSV files to XLSX and back directly in your browser without uploading or signing up.
- No upload
- Runs on your device
- No sign-up
- Free, no limits
How it works
- 1
Click “Add Files” and select a CSV or XLSX file from your device.
- 2
The conversion starts automatically and runs entirely in your browser.
- 3
When processing finishes, download the resulting file to your computer.
What it does
HeyGrow Tools provides a free, browser‑only converter that transforms standard CSV files into XLSX spreadsheets and vice versa. All processing happens locally in the visitor's browser, so no data is sent to a server and no account is required. The tool works on both desktop and mobile browsers, delivering the converted file for immediate download.
Your files stay yours
Your files are processed by code running in this browser tab. They are never uploaded to HeyGrow or anyone else, and nothing is kept after you close the page.
- Convert standard CSV files to XLSX format with header rows preserved.
- Convert XLSX files back to CSV format, preserving data integrity.
- Process files entirely in-browser without transmitting data to servers.
- Access the tool without sign-up, login, or account creation.
Good to know
- Only standard CSV files are supported; formulas, macros, and multiple sheets are not preserved.
- Cell formatting and styling from Excel are not retained in the conversion.
- Very large files may be limited by browser memory and could process slowly.
Frequently asked questions
What file types can I upload?
The tool accepts .csv files for conversion to XLSX and .xlsx files for conversion back to CSV.
Can I convert files on Linux without installing software?
Yes, because the conversion runs in the browser, it works on any operating system, including Linux.
Will my data be uploaded to a server?
No. All files are processed locally in your browser; nothing is uploaded or stored.
Are there any usage limits or watermarks?
There are no usage limits, watermarks, or account requirements for the free tool.
Can the converter handle CSV files with multiple sheets?
CSV does not support multiple sheets; the tool converts a single‑sheet CSV to a single‑sheet XLSX.