Bulk Rename & Group is a tool which allows you to easily rename and organize all your files from internal or external storage in a single operation. Batch rename and group your selection of files with a large variety of features.

Please try the FREE version before purchasing the PRO version:
https://play.google.com/store/apps/details?id=com.direstudio.utils.fileorganizerfree

If you are happy with it and you would like the support the developer you can purchase the ad-free pro version.

Note - This is not a regular file manager.
The purpose of the app is to rename and group multiple files at once in a single operation based on user's selection of features.

Rename or group all your files in three simple steps:
1. Select Input Files
Use the in-app file browser to easily select the input files.
2. Select Action type and parameters.
Customize the operation using the provided features and options.
3. Select Output Path see a preview and start.
Select the output path of the new files and see a preview of the new files before starting the operation.

★ Bulk rename / Batch Rename files with the following available options:

✓ Change Base Name - keep the original base name or set a new one for all the files
✓ Auto Indexing - Add an auto incremented number to each file. This can be customized
by choosing the start index the separator the index position (start or end) and zero
padding
✓ Capitalization - all lower case all upper case sentence case camel case
✓ Extension - keep the original extension update it or remove it completely

✓ Trim - remove all leading and trailing white spaces
✓ Remove chosen characters from the file name
✓ Remove multiple characters separated by comma
✓ Remove characters by type - numbers letters non-numeric non-letter.
✓ Remove characters at position - first n characters last n characters custom range (from position x to position y)
✓ Remove characters by regex - using the desired regex pattern
✓ Replace characters using the desired patterns
✓ Replace characters by regex - using the desired regex pattern

✓ Add Prefix - add specified prefix to all files
✓ Add Suffix - add specified suffix to all files
✓ Add Characters at position -
✓ Add date & time (configurable format) - add the last modified date before or after base name.

★ Bulk group files:

✓ By name - contains starts with or ends with specified text
✓ By modified date - customize parameters (day month year)
✓ By size - all unique sizes or specified size in B KB or MB
✓ By extension - all unique extensions or specified extensions

★ Customize Output

✓ Choose output folder.
✓ Group or rename copies of the selected files without altering the original files.
✓ Group or rename the selected files.
✓ See operation summary and confirm selection before starting.
✓ See a preview of the output files before modifying them.

★ Preferences:

✓ Adjustable application theme - auto light dark.
✓ Adjustable file browser font size.
✓ Adjustable file browser thumbnail size.

Other features:
★ In-app browser for quick file selection - list view & grid view
★ Sort files and folders by name modified date or size
★ Create & folders
★ Delete files and folders
★ Local Search - Current folder
★ Global Search - Internal & External Storages
★ Works on any type of file - audio video photos documents etc.
★ Works for internal and external storage.