FastStone Image Viewer is an image viewer that includes some editing and format conversion tools. It is a good free alternative to ACDSee, with the advantage of being lighter.
Supports formats of images and photos more used: JPEG, BMP, PNG, PCX, PSD, EPS, TIFF, WMF, TGA, ICO and GIF, among others; And also RAW digital camera formats: CRW, CR2, NEF, RAF, PEF, MRW, SRF, ARW, ORF, SR2, RW2 and DNG.
FastStone Image Viewer allows you to rotate photos (at any angle), resize photos (with a choice of 11 algorithms), crop photos, remove red-eye effect, remove shadow effect, adjust brightness or color, apply scales Grays, add frames, apply paint or sketch effect, open files from a scanner, and various tools and effects.
It has drawing tools, to draw lines, rectangles, ovals, curves, etc.; And also the possibility of adding text on the images or watermarks.
With regard to the viewer, it has an interface similar to the Windows explorer that shows the thumbnails of an album or a certain folder. Clicking on any of the photos can be seen in full size, with the possibility of easily accessing all the functions through menus that are placed at the edges of the screen (shown when the mouse pointer is over) . It has support for high resolution monitors (4K).
FastStone lets you create presentations with photos (slideshows), to which you can add background music and select from over 150 effects to apply to transitions.
It has another very useful tool that serves to prepare photos to be sent via email, as it is preferable to send photos of a reasonable size and dimensions (in case you have photos taken with the camera using large resolutions). It also allows you to download photos from the camera to the PC.
FastStone Image Viewer 6.1 is the latest version, updated in December 2016, which can be downloaded and used free of charge for personal use. It is available for Windows (XP up to 10) in Spanish language.