FfFilenameFixer

FREE & PRIVATE

Fix Broken Filenames

Mac creates files with decomposed Unicode (NFD). Windows can't read them properly. Fix it instantly — right in your browser.

Try It Now — FreeChrome Extension
100% Local ProcessingNo Upload Required7 Languages

100%

Local Processing

7

Languages Supported

2

Platforms Available

Convert Your Files

Drop files here or click to select

Filenames will be converted — file contents stay untouched

Got a ZIP from a Mac with broken names inside? Fix the ZIP →

Why FilenameFixer?

Fix in One Click

Upload broken files, download fixed ones instantly

Auto-detect Unicode Form

Automatically detects NFD, NFC, or Mixed forms

Batch Rename & Convert

Process hundreds of files with custom rules

What Problem Does This Solve?

This happens because macOS uses Unicode NFD while Windows uses NFC.

🇰🇷Korean한글.txt한글.txt
🇫🇷Frenchrésumé.pdfrésumé.pdf
🇩🇪GermanÜber.docxÜber.docx
🇻🇳VietnameseViệt Nam.txtViệt Nam.txt
🇪🇸SpanishEspaña.txtEspaña.txt

Supported Languages & Characters

Works with any Unicode text — Korean, French, German, Vietnamese, Spanish, and more.

🇰🇷Korean

한글

🇫🇷French

é, è, ê, ë, ç

🇩🇪German

ö, ü, ä, ß

🇻🇳Vietnamese

ồ, ứ, ễ

🇪🇸Spanish

ñ, á, é, í, ó, ú

🇯🇵Japanese

が, ぱ, ゔ

Your Privacy Matters

100% client-side processing
No files uploaded to any server
No data collection
No account or sign-up required

How It Works

Upload

Drop your files or paste text

Convert

NFD characters are converted to NFC

Download

Get your files with fixed names

Learn more about why this happens →

Frequently Asked Questions

Why do filenames break between Mac and Windows?
macOS uses Unicode NFD (decomposed form) where characters like 'e' are stored as two code points (e + accent). Windows uses NFC (composed form) where 'e' is a single code point. This difference causes filenames to appear broken.
Is it safe to use FilenameFixer?
Yes! All processing happens in your browser. No files are uploaded to any server. Your data never leaves your device.
What languages are supported?
FilenameFixer works with all Unicode characters — Korean, French, German, Vietnamese, Spanish, Japanese, and any other language that uses accented or composed characters.
Does this change my file contents?
No. Only the filename is changed. The file contents remain exactly the same.
Is FilenameFixer free?
Yes, FilenameFixer is completely free to use.