File Name Batch Renamer

File Name Batch Renamer helps you rename user-selected documents with clear local rules and a full preview before anything changes. Choose individual files or open a folder through the Android document picker, build a naming pattern, check every target name, and apply the batch only after confirmation.

The workspace is designed for receipts, exported reports, downloaded documents, image sets, and work files that need consistent names. Add prefixes and suffixes, replace text, clean spacing, append dates, and generate padded counters while keeping file extensions intact.

Features:
Choose files or folders through the Android document picker
Create rename rules with prefix, suffix, find and replace, date, cleanup, case, and counters
Preview every old and new file name before applying changes
Detect duplicate, occupied, empty, or unsafe target names
Confirm before a rename batch is applied
Keep recent rename history in local app storage
Undo recent successful rename batches
No broad storage, contacts, SMS, phone, camera, microphone, location, or account permissions

File Name Batch Renamer is a focused utility for people who organize receipts, exports, documents, project files, and photo sets without sending file information to a server.