OneDrive File Issues

How to Fix Word Changing Document File Names to ASCII Characters

Maira Mehtab Sep 21, 2026 868 views

Question details

Microsoft Word automatically changes document file names to ASCII characters during or after the first save, requiring the user to repeatedly rename the files.

Product: Microsoft Word / OneDrive
Device & OS: not provided
Scenario: Saving new Word documents to OneDrive after a recent Microsoft Office update.
Observed behavior: The file name transforms into ASCII characters upon saving, replacing the intended document name.

Before you start

Verify if your document name contains any special characters, as cloud storage services often enforce strict naming conventions that can trigger automatic renaming.

Solution 1Recommended

Review OneDrive Naming Conventions and Remove Invalid Characters

OneDrive automatically changes file names containing unsupported characters to their ASCII equivalents to prevent cloud synchronization errors.

Microsoft OneDrive does not support certain characters in file names. If a document is saved with these characters, OneDrive may automatically rename the file to a supported ASCII equivalent.

If this behavior started after a recent Office update, it could be the result of a stricter enforcement of Microsoft's cloud synchronization rules.

Check the original file name

Review the file name you are attempting to use for any special characters or symbols.

Rename without special characters

When saving the file in Word, strictly use alphanumeric characters, dashes, or underscores. Avoid characters like asterisks, question marks, or slashes.

Verify synchronization in File Explorer

Open File Explorer, navigate to your OneDrive folder, and confirm that the document name displays correctly without reverting to ASCII characters.

Microsoft Support Reference: Microsoft maintains a specific support article explaining why filenames change in OneDrive, detailing the complete list of restricted characters.

Solution 2

Save the Document Locally Before Moving to OneDrive

Bypassing direct saves to OneDrive can prevent Word from automatically renaming the file during the initial document save process.

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Switch to WPS Office for Hassle-Free Document Management

If you are tired of frustrating sync bugs and unexpected file renaming in Microsoft Word, consider switching to WPS Office. It provides a lightweight, highly compatible, and free alternative with intuitive cloud storage solutions.

1. Download the software: Visit the official WPS Office website and download the free installer for your operating system.
2. Install and Launch: Run the downloaded installation file and launch the WPS Writer application.
3. Open existing files natively: WPS Office automatically recognizes and opens your existing Microsoft Word documents flawlessly, preserving your original file names and formatting.

Fully compatible with Microsoft Word (.docx), Excel, and PowerPoint formats.No unexpected automatic file renaming or strict ASCII character conversions.Lightweight installation and familiar user interface for a seamless migration.Built-in robust cloud storage alternative (WPS Cloud) for easy cross-device syncing.

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Frequently Asked Questions

Why does OneDrive change my document file names?

OneDrive automatically changes file names when they contain invalid or restricted characters to ensure the file can sync correctly across all servers and platforms without causing directory errors.

Can I stop Word from changing my file name to ASCII?

You can prevent this by ensuring your initial file name only uses supported alphanumeric characters. Alternatively, saving the file to a local directory before moving it to OneDrive can sometimes bypass strict application-level renaming.

Did a recent Office update cause this file renaming issue?

It is highly possible. Microsoft frequently updates OneDrive and Office sync policies. Stricter enforcement of naming conventions in a recent update might cause files that previously saved without issue to be automatically renamed.

What characters are not allowed in OneDrive file names?

Characters such as quotation marks, asterisks, colons, less than, greater than, question marks, slashes, and pipes (" * : < > ? / \ |) are strictly prohibited in OneDrive and SharePoint file names.

Document & File Issues