Filename portability checker
Check folder names for Windows reserved names, long components and potential case or Unicode conflicts.
Accepted files: see this tool’s format requirements. Multiple files supported. No total size limit.
Up to 2,000 selected files. Examines names and sizes only. These conservative Windows, macOS and Linux checks do not simulate every filesystem or permissions configuration. Up to 1,000,000 characters. Review the settings before running.
Your result
How to use Filename portability checker
- Choose the folder you want to inspect.
- Review the options and run the check.
- Read the result and download the report.
Useful next steps
Choose one local folder
Use the folder picker and confirm the files you want to inspect. Nested paths are preserved. Choosing another folder replaces the selection.
Review the result
Check folder names for Windows reserved names, long components and potential case or Unicode conflicts.
Download your report
Save the report or manifest to keep the results. Your source files are unchanged, and the processing stays in your browser.