A locked Word, Excel, or PowerPoint file
Office has collected several different "passwords" over the years, and they're not equally serious. Some are a light latch you can lift in seconds; one is real encryption. Knowing which you have is the whole game.
The three protections you might be hitting
- Password to modify. The file opens as read-only unless you enter a password. You can still read everything — this is a courtesy lock, not encryption.
- Restrict editing / protected sheet. In Word, editing is limited; in Excel, a worksheet or the workbook structure is protected. The content is fully visible; specific actions are switched off.
- Password to open (Encrypt with Password). The whole file is encrypted. You can't see anything until you enter it. This is the serious one.
If you can see the document at all, you're in the first two categories. If you're stuck at a prompt before anything appears, it's the third.
Password to modify, or restricted editing
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Open read-only and save a copy
Choose "Read Only" at the prompt, then use Save As to make a fresh copy. For a "password to modify" lock, the new copy often carries no such restriction.
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Lift the protection where you set it
In Word, Review → Restrict Editing → Stop Protection. In Excel, Review → Unprotect Sheet or Unprotect Workbook. If you're the owner and remember the password, this clears it directly.
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Rebuild from the source if it's quicker
If the material also lives somewhere unprotected — an email draft, a template, an export — starting from that can be faster than fighting the lock.
If your worry is a lost or corrupted file rather than a forgotten password, look at File → Info → Manage Document (or Version History if it's saved in OneDrive or SharePoint). An earlier, unprotected version may already be sitting there.
Password to open (encrypted)
Modern Office encryption is strong, so — as with an encrypted PDF — the honest task is finding the password rather than getting around it. There's no supported back door, and that's deliberate.
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Search your password manager
Look up the file name, the client, or the project it belongs to. If you routinely encrypt files, it may well be saved already.
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Contact whoever encrypted it
For a file a colleague or provider sent you, asking for the password — or for an unencrypted copy — is the cleanest route by far.
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Look for an earlier draft
Encryption applies to this saved copy. A pre-encryption draft in your email, a shared drive, or a backup may open with no password at all.
When none of those routes turn it up and the file uses current Office encryption, there's no legitimate way to force it open — the encryption is doing exactly what it's meant to. Recreating the document from its source is realistically the way forward, and we'd rather say so than point you toward "recovery" services that don't apply to genuine encryption.