Renames many files at once according to a pattern — adding a sequence number, date, or common prefix, for example — instead of renaming each file by hand.
For example: You have 100 camera photos named things like IMG_1234.jpg and want them renamed to something readable, like "Vacation-01.jpg", "Vacation-02.jpg", and so on — set a pattern and rename them all at once.
Who uses it most: Photographers, archivists, document management specialists, designers
No — renaming happens locally in your browser; the files on your computer aren't touched, and the result downloads fresh with the new names.
Yes, you can set the starting number and how many digits it uses (like 001, 002, and so on).