In Excel: use File ▸ Info ▸ Protect Workbook ▸ Always Open Read-Only for a polite prompt, or Save As ▸ Tools ▸ General Options and set a Password to modify for one that cannot be dismissed.
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For a nudge: File ▸ Info ▸ Protect Workbook ▸ Always Open Read-Only, then save.
For enforcement: File ▸ Save As ▸ Browse ▸ Tools (beside Save) ▸ General Options ▸ Password to modify. Record the password — there is no recovery.
To undo either, open the file with edit rights and clear the same setting, then save.
If the file still opens read-only, check the file itself: right-click ▸ Properties ▸ uncheck Read-only on Windows, or Get Info ▸ Sharing & Permissions on macOS.
On a network share or SharePoint, also check that you have write permission and that nobody else has the file open.
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. Most people learn this as a sequence of clicks and forget it by next week; learning it as a pattern instead is what lets you apply it to the next, slightly different version of the problem without starting from scratch. That is the difference this page is trying to make. The difference between a quick fix and a sheet you can trust is the extra minute you spend validating “excel read only change”. Start on a copy or a tiny sample, keep the affected cells 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 workflow that saves repeating the same clicks every week, 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. When the result is not what you expected, undo straight away rather than repairing it by hand — undo restores the sheet exactly, while manual fixes tend to leave small inconsistencies behind that surface later.
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. The aim was to get you unstuck fast and leave you a little more capable than a copy-paste would. The answer is at the top and the detail above shows why it holds — so the next time a colleague asks, you can answer without reaching for search. If you take one thing from this page on “excel read only change”, make it the order of checks rather than the individual clicks: confirm what is selected, apply the step, and look at the result before moving on. That small routine is what keeps Excel work predictable when the same task comes back in a slightly different workbook.
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
How do I make an Excel file read-only?
File ▸ Info ▸ Protect Workbook ▸ Always Open Read-Only for a prompt, or Save As ▸ Tools ▸ General Options ▸ Password to modify to enforce it.
How do I remove read-only from an Excel file?
Open it with edit rights and clear the same setting you set, then save. If it was the file attribute, uncheck Read-only in the file's Properties (Windows) or fix permissions in Get Info (macOS).
Why does my Excel file open as read-only when I did not set it?
Usually the file or folder is marked read-only by the operating system, the file is open by someone else on a shared drive, or it came from the internet and is in Protected View.
Is read-only the same as protecting a sheet?
No. Sheet protection locks cells inside a workbook you can still save; read-only governs whether the file itself can be overwritten.
Other ways people ask this
On the way here you may have searched this as “change read only in excel” and “how to change read only excel” — it is all the same task, and this page is the single, complete answer to it.
Why do people search for this in so many different ways?
Because the same task has many names. “change read only in excel”, “how to change read only excel” all point at the one operation explained on this page, which is why they all lead here.