Bulk rename - Filename changer

Bulk Rename is a lightweight tool that lets you rename every file inside a folder in one shot.

■ Features
• Bulk filename changes
- Find and replace
- Add prefix
- Add suffix (inserted before the extension)
• Bulk extension changes
- Target one specific extension
- Change every file's extension
- Remove extensions
• Live preview before applying
• Conflict detection
- Warns about duplicate target names
- Blocks invalid names
• Undo the most recent operation in one tap (session-scoped)
• Two-stage temp name strategy prevents chained-rename conflicts
- Safely handles renames like a.txt → b.txt and b.txt → c.txt

■ Design
• Material You dynamic colors (Android 12+)
• Automatic light / dark mode
• Korean / English switch in place (no restart)

■ Safe by design
• Storage Access Framework: accesses only folders you explicitly grant
• No broad file permission required
• Never reads file contents — only renames
• Everything happens locally on your device

■ Ads
A small banner ad helps keep the app free.

■ Contact
chanstar623@gmail.com