What are the tabs in this spreadsheet?

What the breakdown looks like

Upload the file here and we'll list every tab by name, tell you how many rows of data are on each one, and show you the column headers so you know at a glance what's where. For each tab you'll see: its name, whether it was visible or hidden, the number of rows with data, and the column headers in order. If a tab is completely empty, that shows up too — "0 rows, no columns" is a useful thing to know when you're trying to figure out why data you expected isn't there.

Real people say "tabs" — not "worksheets" or "sheets"

Excel calls them worksheets, and the technical term is sheets. But nearly everyone who isn't an Excel power user calls the little clickable things at the bottom of the spreadsheet tabs. A file from your supplier, your accountant, or a coworker could have one tab or twenty-five tabs, and figuring out which tab has which data — especially without breaking anything — takes time you might not have.

Hidden tabs

Excel lets people hide tabs so they don't appear in the tab bar at the bottom of the screen. Hidden tabs still exist in the file — they just don't show up unless you know to look. This is common in files built by someone else: formulas on a visible tab pull from data on a hidden tab, and if you don't know the hidden tab is there, you might accidentally break the file by deleting something that something else depends on.

We surface hidden tabs in the results alongside the visible ones, so you know the full picture before you start working with the file.

When this is most useful

You inherited a file from someone who left, and you need to understand it before touching anything. A vendor sent a data export and you need to know which tab to import. Someone asked you to "update the numbers in the spreadsheet" but didn't say which tab. Your file crashes before it fully opens and you want to see the structure before trying again with a bigger machine.

None of those situations require you to calculate anything or know Excel well. They just require seeing what's in there.

Once you know which tab you want to work with, you can convert it to a CSV using Convert Excel to CSV — no Office required.

Need to see what's inside from inside an AI agent or automation script? Install xlsx-for-ai and call xlsx_list_sheets to get the full tab inventory programmatically.