XLSX File — Open & Convert .xlsx Online
What Is a .xlsx File?
XLSX (.xlsx) is a spreadsheet file format. XLSX is the default Microsoft Excel spreadsheet format. Created by Microsoft, this format is essential for analysts and accountants.
How to Open .xlsx Files
Upload your .xlsx file to OpenAnyFile and instantly view and filter it in your browser. No software installation required. Works on Windows, macOS, Linux, iPhone, and Android.
Everything About XLSX Files
Popular XLSX Conversions
Frequently Asked Questions
What is a .xlsx file?
A .xlsx file is a spreadsheet format called XLSX. XLSX is the default Microsoft Excel spreadsheet format.
How do I open a .xlsx file without installing software?
Upload your .xlsx file to OpenAnyFile. Our browser-based tool instantly detects and displays it — no downloads needed.
What program creates .xlsx files?
.xlsx files are typically created by Microsoft.
Can I convert .xlsx to another format?
Yes. OpenAnyFile converts .xlsx to CSV, JSON, PDF, ODS, XLS.
Is it safe to open .xlsx files online?
Yes. OpenAnyFile processes files in a secure, isolated environment. Files are automatically deleted and all transfers use HTTPS.
Can I open .xlsx on my phone?
Yes. OpenAnyFile works on all mobile browsers including iPhone and Android.