How to Open an XLSX File on Windows, Mac, or Your Phone

What opens an XLSX file

An XLSX file is a spreadsheet — a grid of rows and columns that hold numbers, text, and formulas. Microsoft Excel opens it natively, but you have other options that cost nothing. On Windows, Mac, and phones, you can open XLSX files with Google Sheets (free, online), LibreOffice Calc (free, installed software), or the mobile apps from Microsoft, Google, or Apple. The file itself is just data; what opens it depends on what you have on your device right now.

The fastest route is usually whatever program you already have. If you have Microsoft 365 or Excel installed, click the file and it opens. If you don't, Google Sheets opens it in your browser without installing anything. LibreOffice Calc is the choice if you want desktop software that works offline and costs nothing.

Key Takeaways

Microsoft Excel, Google Sheets, LibreOffice Calc, and Apple Numbers all open XLSX files without conversion or special steps.
Google Sheets opens XLSX files directly in your web browser and requires no installation or payment.
On Windows, right-click the XLSX file, select "Open with", and choose from programs already on your device.
Mobile phones have free apps from Microsoft, Google, and Apple that open XLSX files from email, cloud storage, or your phone's files.
If a file won't open, the most common cause is that the program you're using doesn't have permission to read files from that location.

Opening an XLSX file on Windows

On Windows, the simplest method is to find the XLSX file and double-click it. Windows will open it with whatever program is set as the default for spreadsheets. If you have Excel or LibreOffice Calc installed, one of those will launch. If neither is installed, Windows will offer to find a program for you — select Google Sheets from the list, or search for "LibreOffice" if you want offline software.

If double-clicking doesn't work or opens the wrong program, right-click the file. Select "Open with" and choose from the list of programs on your device. If you don't see the program you want, select "Choose another app" at the bottom. This shows every program that can read spreadsheets. Pick one and check the box that says "Always use this app to open XLSX files" if you want Windows to remember your choice.

If you see an error message saying the file is corrupted or can't be read, try opening it with a different program first — sometimes one program can read a damaged file when another cannot. Google Sheets is often more forgiving with files that have formatting problems.

Opening an XLSX file on Mac

On Mac, find the XLSX file in Finder and double-click it. If you have Excel or Numbers installed, one of those will open. If not, your Mac will show a dialog asking which program to use. Select "Google Sheets" if you want to open it online, or search the App Store for "LibreOffice" if you want free desktop software.

To change which program opens XLSX files by default, right-click the file and select "Open With". Choose the program you want, then click "Change All" at the bottom of the dialog. This tells your Mac to always open XLSX files with that program. If you want to open just this one file with a different program, select it from the list without clicking "Change All".

Numbers, Apple's built-in spreadsheet app, opens XLSX files but sometimes changes the formatting slightly. If the file looks wrong in Numbers, try opening it in Google Sheets or LibreOffice Calc instead — they preserve the original layout more closely.

Opening an XLSX file on your phone

On iPhone or Android, XLSX files usually arrive through email or cloud storage like Google Drive, OneDrive, or Dropbox. Tap the file and your phone will open it with whatever spreadsheet app you have installed. If you don't have one, your phone will prompt you to download one — Microsoft Excel, Google Sheets, and Apple Numbers are all free.

If the file is saved to your phone's local storage, open your Files app (on iPhone) or Files by Google (on Android), find the XLSX file, and tap it. Your phone will open it with the default spreadsheet app. To change which app opens it, long-press the file, select "Open With", and choose a different program. Some phones let you set a default; others ask each time.

Phone spreadsheet apps are designed for viewing and light editing, not complex formulas or large files. If the file has thousands of rows or complex calculations, open it on a computer instead — phones can slow down or crash with very large spreadsheets.

Using Google Sheets to open XLSX files

Google Sheets is the easiest option if you don't want to install anything. Go to sheets.google.com in your web browser, click the "+" button to create a new sheet, then select "File" and "Open". Choose "Upload" and select your XLSX file from your computer. Google Sheets converts it to its own format and opens it in your browser.

You can also drag and drop an XLSX file directly onto the Google Sheets home page — it will upload and open automatically. Once it's open, you can edit it, share it with others, or download it back as an XLSX file if you need to send it to someone using Excel.

Google Sheets preserves most formatting and formulas, but very complex Excel files sometimes lose features that Google Sheets doesn't support — things like certain chart types or advanced macros. For most everyday spreadsheets, Google Sheets handles them perfectly.

Using LibreOffice Calc to open XLSX files

LibreOffice Calc is free desktop software that opens XLSX files without needing the internet. Download it from libreoffice.org, install it on your computer, then open LibreOffice Calc. Click "File", then "Open", and select your XLSX file. It opens in the same window with full editing capability.

LibreOffice Calc preserves Excel formatting and formulas very closely — it's designed to be compatible with Excel files. If you work with complex spreadsheets or need to work offline, LibreOffice is a solid choice. It works on Windows, Mac, and Linux.

The main limitation is that LibreOffice Calc doesn't support every single Excel feature — some advanced macros or newer Excel functions may not work. For standard spreadsheets with formulas, charts, and formatting, it handles them well.

What to do if the file won't open

If you get an error when trying to open an XLSX file, the most common cause is that the program doesn't have permission to read files from that location. If the file is on a network drive or a shared folder, make sure you're connected to that network and have permission to access it. If it's on an external drive, make sure the drive is plugged in and recognized by your computer.

If the file is on your computer but still won't open, try opening it with a different program. Right-click the file, select "Open With", and choose Google Sheets or LibreOffice Calc. Sometimes one program can read a file that another cannot, especially if the file is slightly corrupted or uses an older Excel format.

If you're trying to open the file from an email attachment, download it to your computer first instead of opening it directly from the email. Email programs sometimes block attachments from opening, or the file may not download completely if you open it directly.

Frequently Asked Questions

Can I open an XLSX file without installing any software?

Yes. Go to sheets.google.com, click the "+" button, select "File" and "Open", then upload your XLSX file. Google Sheets opens it in your web browser. You can view and edit it without installing anything on your computer.

What's the difference between XLSX and XLS?

XLSX is the newer format that Excel has used since 2007. XLS is the older format from Excel 2003 and earlier. All modern programs open both formats the same way — double-click the file or use "Open With". The difference is internal; you don't need to do anything different to open them.

Why does my XLSX file look different when I open it in Google Sheets?

Google Sheets and Excel handle some formatting slightly differently — fonts, spacing, and colors may shift. The data itself is unchanged. If the appearance matters, open the file in Excel or LibreOffice Calc instead, which preserve Excel formatting more closely.

Can I edit an XLSX file on my phone?

Yes. Download the free Microsoft Excel app, Google Sheets app, or Apple Numbers app from your phone's app store. Open the file from your phone's storage, email, or cloud storage, and you can edit it. Phone apps are designed for light editing; complex work is easier on a computer.

What if the file is password-protected?

When you try to open a password-protected XLSX file, the program will ask you for the password. Type it in and the file opens. If you don't know the password, you cannot open the file — there is no way to bypass it. Contact whoever sent you the file and ask them for the password.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.