OneDrive File Issues

How to Fix OneDrive Filename or Extension Too Long Errors

Huma Ashraf Ch Oct 1, 2026 868 views

Question details

Users are encountering an error preventing them from syncing or moving files in OneDrive due to the filename or extension being too long, even when the destination path appears to be short.

How to Fix OneDrive Filename or Extension Too Long Errors

Product: OneDrive
Device & OS: not provided
Scenario: Syncing, moving, or copying folders and files within the OneDrive directory.
Observed behavior: OneDrive displays an error message stating that the filename or extension is too long and blocks the file transfer or sync process.

Before you start

Before attempting to rename your files, click on the OneDrive icon in your system tray to view the sync error list and identify the exact file causing the issue.

Solution 1Recommended

Shorten Nested Folder and File Names

Since OneDrive and SharePoint enforce a strict maximum path length of approximately 400 characters, reducing the name lengths of nested folders is the most effective fix.

Even if the immediate destination (such as E:/OneDrive) appears short, the system evaluates the entire original path length, including hidden nested directories.

When the combined characters of the drive letter, primary folders, subfolders, and the file name itself exceed 400 characters, OneDrive will stop syncing and produce this error.

Locate the problematic file path

Open File Explorer and navigate to the original file location (e.g., C:\Users\[Username]\OneDrive\) that is failing to sync.

Identify deep folder structures

Look for nested folders with excessively long names, or folders that have many layers of subfolders.

Rename folders and files

Right-click the folder or file, select 'Rename' from the context menu, and give it a concise, shorter name.

Move files closer to the root

If renaming isn't enough, cut and paste the files into a higher-level folder (closer to the main OneDrive directory) to reduce the overall path length.

Sync Resumes Automatically: Once the path length falls below the 400-character limit, OneDrive will automatically detect the change and resume syncing the files.

Solution 2

Open a Support Ticket for Microsoft 365 Business Accounts

If you are managing a Microsoft 365 business account and the path is definitively short, the error might stem from backend inconsistencies requiring administrator support.

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Frequently Asked Questions

What is the maximum file path length for OneDrive?

OneDrive and SharePoint generally support a total file path length of up to approximately 400 characters. This limit includes the entire structure: the drive letter, all folder and subfolder names, the file name, and the extension.

Why do I get a path length error when my destination folder is empty?

The error is often triggered by the original path of the file rather than the destination. Even if the immediate destination looks short, the total character count of the nested structure where the file currently resides might exceed the 400-character limit.

Does the 400-character limit apply to Mac users as well?

Yes, the path length limit is enforced by the OneDrive and SharePoint cloud server infrastructure. It applies to all files being synced, regardless of whether you are using Windows, macOS, or a mobile operating system.

Document & File Issues