Squarespace doesn't offer a built-in spelling checker, but our supported browsers do. By enabling your browser's spelling checker, you can identify misspelled words and grammatical errors while editing page content or blog posts. Here's more information on browser spelling checkers:
Another option is spell-checking your text in an editing program before adding it to your site. Copying and pasting text from another program can carry over formatting, so we recommend visiting Fixing text formatting to avoid any issues.