Sudoku Solver and Scanner is an online puzzle-solving service offering more than 50 free solvers for a wide range of Sudoku formats. Users can enter numbers or letters directly into a grid, upload an image, or scan a puzzle using a mobile device camera, then solve it instantly. The site supports standard Sudoku in multiple grid sizes, from 6x6 through larger formats, as well as alphabet-based puzzles and Wordoku.

Its collection also includes overlapping puzzles such as Samurai and Butterfly Sudoku, diagonal and irregular variants, and specialized formats including Hyper, Windoku, Odd-Even, Toroidal, and Disjoint Groups Sudoku. Tools let users solve individual cells, undo a cell’s solution, reset a board, and save progress automatically so they can return to a puzzle later. The site also provides help and support information, contact details, donation options, and a privacy policy.

For users who prefer an uncluttered experience, it offers an ad-free option