XLSX is the modern Microsoft Excel workbook format. It stores multiple sheets with values, styles and charts, and opens in Excel, WPS Office, Numbers and Google Sheets.
Typical use: Convert to XLSX when the data needs real spreadsheet power — sorting, filtering, formulas — or must be shared with Excel users.
About the XLSX format
XLSX is the modern Excel workbook (default since Excel 2007, same OOXML zip-package idea as DOCX). One file can carry multiple sheets, typed cells, formulas that recalculate, charts, conditional formatting and pivot caches — a small application, not just a table. LibreOffice, Google Sheets and WPS open it natively, and server-side libraries can read and write it without Excel installed.
Being a spreadsheet program's file, it is a poor plain-data exchange format: formulas reference cell positions that break when rows are reordered, hidden sheets and cached values surprise consumers, and the zip package is heavier than CSV. For analysis and finance it is the right tool; for pipelines, export the CSV.
Strengths
- ✓ Multi-sheet with formulas, charts and formatting
- ✓ Typed cells and recalculation
- ✓ Opens natively across the office ecosystem
Limitations
- ✗ Heavier and less diff-friendly than CSV
- ✗ Formulas tie data to cell positions
- ✗ Hidden state (sheets, caches) surprises downstream tools
- Structure
- Multiple sheets
- Types / schema
- Typed cells + formulas
- Compatibility
- Excel 2007+, LibreOffice, Sheets
- Best for
- Finance, analysis, models
Tools Actions on XLSX files themselves
Convert XLSX to…
27 direct directions plus 3 workflows, sorted A–Z; 🔥 marks popular targets.
Cross-engine workflows
Convert other files to XLSX…
Frequently asked questions
What is a XLSX file?
XLSX is the modern Microsoft Excel workbook format. It stores multiple sheets with values, styles and charts, and opens in Excel, WPS Office, Numbers and Google Sheets.
How do I convert XLSX files online?
Pick a target format from the "Convert XLSX to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.
Is it safe to convert XLSX files here?
Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.
Which formats can XLSX convert to?
This page lists all 31 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.