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.
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. The same idea underpins a lot of everyday Excel work, so the few minutes spent getting it right here pay back across every sheet you build afterwards. Treat it as a pattern, not a one-off, and it stops being something you look up and starts being something you reach for. For “change excel from read only”, the reliable version is a short checking loop, not just the first command that appears to work. Run it on a deliberately small range first, watch how the affected cells change, and only then apply the same setup to the full sheet. 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. That is what makes a workflow that saves repeating the same clicks every week useful in real work: repeatable, auditable, and not dependent on memory or luck.
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. One habit worth forming early: name the cells that hold your inputs, so the formula reads in plain language instead of a string of cell addresses. A reviewer — or you in three months — can then follow the logic without decoding what B7 and D2 were supposed to mean, which is most of what makes a sheet maintainable.
In Google Sheets
Everything above works in Google Sheets too. Excel and Sheets share the formula syntax used here; only the surrounding menus are arranged differently. That portability is deliberate — learn it once and it follows you between the two tools and across Windows and Mac. 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, the tool proves it, and the detail above shows why it holds — so the next time a colleague asks, you can answer without reaching for search. The short version of “change excel from read only”: the answer is at the top of this page, the tool proves it on your own numbers, and the sections above explain why it holds so the next variation does not stump you. Excel rewards people who reference cells instead of typing values and who keep inputs separate from formulas, because that is what makes a result you can audit months later. Build it once, deliberately, with the live tool as a check, and you convert a one-off lookup into a reusable skill — which is the whole point of learning the why and not just the what.
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
This is also commonly searched as “change excel from read only” and “how do you change excel from read only”. They describe the identical operation, so you are in the right place no matter how you phrased it.
This guide also answers
- excel read only change
Why do people search for this in so many different ways?
Because the same task has many names. “change excel from read only”, “how do you change excel from read only” all point at the one operation explained on this page, which is why they all lead here.