How to Make Excel Workbook Read Only

What this does

Excel has three different things called "read-only", and they are not equally strong. **Always Open Read-Only** sets a flag in the file: every opener sees a prompt asking whether to open read-only, and anyone can answer no. **Password to modify** (Save As ▸ Tools ▸ General Options) requires a password before edits can be saved — without it you can still open and read, but not overwrite. **Mark as Final** is only a hint; one click on "Edit Anyway" removes it. Separately, the operating system's own read-only file attribute (Finder ▸ Get Info, or the Windows file Properties dialog) blocks saving over the file regardless of what Excel thinks, which is why a workbook can open read-only with none of the Excel settings turned on. Before you run it on a workbook other people depend on, try it on a copy or a few rows first. Undo only reaches back through the current session, so a quick trial run is the cheapest way to see exactly what will change before the file is saved and shared. The difference between a quick fix and a sheet you can trust is the extra minute you spend validating “make excel workbook read only”. Start on a copy or a tiny sample, keep the affected sheet visible, and compare the result with the tool above before you touch the real workbook. When this is a ribbon command, the selection matters more than the button: confirm the range, apply the command, then spot-check the output before saving. The point is a layout choice that keeps the sheet readable and sortable, but the practical win is that someone else can open the file and understand what happened without asking you.

A worked example

A price list several people consult and one person maintains: File ▸ Info ▸ Protect Workbook ▸ Always Open Read-Only, then Save As ▸ Tools ▸ General Options ▸ Password to modify = the maintainer's password. Colleagues open it, get the read-only prompt, read the prices and cannot overwrite the file; the maintainer types the password and edits normally. Read-only is the right control when a workbook is meant to be consulted by many and maintained by one — but only the modify-password variant actually enforces that. A practical tip: try it on a copy of the sheet or a handful of sample rows first and check the result before you apply it to the real data. That one habit catches almost every surprise while it is still cheap to reverse.

In Google Sheets

This is a command rather than a formula, so there is no syntax to carry over. Google Sheets arranges its commands in menus across the top instead of a ribbon, names some of them differently and does not have every Excel command — look for the equivalent in the Sheets menus or its help before assuming the steps match. Keep this page bookmarked for the next time the same question comes up. Better still, repeat the steps once in your own workbook — doing it yourself is what turns a copied answer into something you remember. The short version of “make excel workbook read only”: the answer is at the top of this page, and the sections above explain why each step matters, so a variation of the problem does not stump you. Try it once on a copy of a real file and the steps stick far better than re-reading them.

Common mistakes

• Trusting Mark as Final as protection — it is a label, and "Edit Anyway" removes it in one click.
• Confusing "Password to open" with "Password to modify": the first stops people reading the file at all.
• Setting a modify password and losing it — Excel cannot recover it, and the workbook can then only be read.
• Blaming Excel when the read-only flag is on the file or the folder permissions, where no Excel setting will change anything.
• Assuming read-only protects the numbers: anyone can save a copy under a new name and edit that freely.

Frequently asked questions