Letter Toolbox is an online word-solving resource for people working on word games, puzzles, and vocabulary activities. Its tools help users make sense of letter combinations, find words that match known clues, and check possible answers. The Word Unscrambler generates words from jumbled letters, while the Anagram Solver finds words using exactly the same letters.

For clue-based searches, users can try the Crossword Solver or Word Finder, including searches by starting letters, endings, included letters, or word length. The site also provides a Scrabble Word Finder for rack-based plays, a Wordle Solver for narrowing down possible answers, and a Word Checker that reports dictionary validity and score. Additional features include a Word Scrambler for creating jumbles and a Random Word Generator with filters.

Visitors can browse word lists by length, popular beginnings and endings, or letter characteristics, such as words containing Q, Z, X, or J. The site states that its English word collection contains 172,999 entries and also offers a Dutch word collection