Documents
Convert CSV to XLSX locally and privately
Transform your CSV text, sheets, or structures into XLSX format in the blink of an eye. CSV is the basic tabular standard of cell and row values separated by commas, used for data exchange. The local engine compiles and processes your data directly in your RAM securely.
What is CSV?
Plain text data file with comma-separated values.
- ✓ Universally importable into databases and Excel
- ✓ Ultra-lightweight and 100% readable as pure text
- ✓ Ideal for data migration
- ✗ Does not preserve styles, colors or formulas
- ✗ Parsing issues if text data contains commas
Why convert to XLSX?
Powerful spreadsheet workbook by Microsoft Excel.
- ✓ De facto industry standard for spreadsheets
- ✓ Supports powerful formulas and millions of rows
- ✓ Efficient XML compression
- ✗ Complex formulas may not render the same in other programs
- ✗ Not legible at a glance without an office suite
Other popular Document conversions
Local-First Philosophy
Your files stay at home. By pure architecture.
I designed Nua Convert with a very simple golden rule: the best way to protect your files is to never have them. That's why all processing is executed 100% in your browser using modern JavaScript, Canvas, and WebAssembly APIs.
The server only sends you the web page to load. Once you're inside, you can disconnect from the internet if you feel like it: the workspace will continue to function perfectly locally. No tricks, no catches, no strings attached.
Web vs Desktop
Use web for fast tasks. Download the App for heavy duty.
The browser is great for quick, daily tasks like optimizing a PNG, formatting code in a pinch, or compiling a fast PDF. But if you need to convert gigabytes of video, transcode entire folders of music, or compress giant files, the Nua Convert desktop app takes full advantage of every core of your processor, without the memory limits imposed by Chrome or Firefox tabs.
Nua Convert Web
Your local document converter in the browser
- Local conversion of CSV to XLSX
- Page size settings for A4, Letter, Legal, and margins
- 100% offline conversion after loading Wasm engine
- Instant conversion of extremely heavy files
- Mass merging, splitting, and compression of multiple PDFs
- Unattended background processing without slowing down PC
Nua Convert Desktop
Full local power of your computer
- Instant conversion and rendering of extremely heavy files
- Complete PDF suite to merge, split, and compress locally
- Native batch processing of multiple folders at once
- Use without internet, bypassing heavy engine download wait times
- Fluid integration with the system's file explorer