File suffix case converter
Batch-convert file suffixes in text to upper or lower case without touching the file system.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
File names
Result
Converted names
Enter text to see results
What this tool does
- Prepare rename lists
- Normalize extensions
Example
Input
a.txt b.PDF
Output
a.TXT b.PDF
Only file-name text is changed.
Frequently asked questions
Does it modify files?
No.
Which dot is used?
The final extension dot.
What about extensionless names?
They stay unchanged.
Keywords：后缀扩展名大小写suffixextension