Is it squeek or squeak?

The correct spelling is squeak, not squeek. Squeak is the standard, dictionary-approved spelling for the high-pitched sound made by mice, doors, toys, and shoes. Squeek is a common misspelling that appears due to phonetic confusion, as people hear the ee sound and think of week, but the correct form includes a after qu, as in squeak. You can remember it because squeak contains queak like in beak and peak. The verb forms are squeaks, squeaking, squeaked, and squeaky, all spelled with ea. Squeek is not listed as a correct alternative in major dictionaries like Oxford or Merriam-Webster, though it may appear in informal brand names or nicknames intentionally misspelled for style. So if you are writing about sound, always write squeak. For example, the mouse went squeak, the door squeaks, squeaky clean, not squeek. Spell check will flag squeek as error. So answer is it is squeak, not squeek, and squeak is the only correct spelling for the noun and verb meaning high-pitched noise.