TGMDev Photo Renamer 4.0b is a freeware that rename your photos (on both your computers and mobiles) according to the date and the time you took the pictures (from file date and time or Exif Data) and a Highly customizable Renaming Mask. Using an Explorer-like control, browsing the files is very easy and intuitive. Renaming Masks are strings that contains up to 53 different format specifications (Day, Month, Year, Hour, Min., Sec. Photo Number, free text, picture counters, keywords, keyboard entries, ...) . File as 'IMG_01234.jpg' can be renamed as 'TGMDev-31-Dec-2011-16-51-26.jpg' or 'Lumix-FZ45-01234-2011-Dec-31-16-51-26.jpg'. PhotoRenamer 4.0b supports multiple selection filters (that can be turn case sensitive) and displays the files list with high-resolution thumbnails. Picture Preview rotates automatically the pictures according to Exif so that it appears correctly on screen. Pictures without Exif Data or with invalid/incomplete Exif data can be rotated manually. Double-Click on the picture for detailed picture view with main picture data: more than 60 Exif Metadata (including GPS data) and IPTC Metadata (if available). Duplicate Files are highlighted in customizable colors. Tooltips provide information on application features (this option can be toggle on or off). PhotoRenamer 4.0b handles the mobile devices compliant with Windows Portable Devices (WPD) Library, so that you can also rename files located in your mobiles.