CSV to Excel
Convert CSV files to XLSX using SheetJS in the browser.
Drop files here or click to upload
One file is processed at a time on the free tier. Up to 100MB, processed locally in this browser.
Step by step
How to use CSV to Excel
Open the CSV to Excel tool, drop your file into the upload area, choose any settings that match your output needs, and start the browser-side processor. For live tools, the file is read with the File API and transformed locally.
The progress bar shows each stage while the page packages your XLSX result. When processing completes, the download starts automatically and the green result card stays available as a fallback download link.
Because the workflow is browser-only, your original document is not sent to FluxFile servers. Refreshing or closing the tab clears the working file from memory.
Why use it
CSV to Excel is built for fast, no-account document work. It is useful when you need a quick XLSX output and do not want to upload private files to a third-party queue.
Tips
Keep files under 100MB on the free tier, use smaller page ranges for very large PDFs, and download the result before leaving the tab.
Privacy
The implementation lazy-loads client libraries after selection. File names are stored only in localStorage for the optional recent conversions list.
FAQ
Is CSV to Excel free?
Yes. CSV to Excel is available as a free browser tool with no signup requirement and no watermark on the output.
Are my files uploaded?
Live processors run in the browser. Your file is read locally, processed on your device, and not posted to a conversion server.
What file size is supported?
The free tier is designed around files up to 100MB. Larger files are part of the premium architecture.
What output format does this tool create?
CSV to Excel creates XLSX output. The result appears in the download panel after processing.
Do I need an account?
No. The free tools are designed to work without login, signup, or account setup.
Does it work on mobile?
Yes. The interface is responsive and supports mobile uploads where the browser and operating system allow file selection.