Go to File > Options > Proofing and select AutoCorrect Options. On the AutoCorrect tab, select or clear Replace text as you type.

You may be distracted from your writing task when Word for the web immediately marks misspelled words. To avoid that distraction, you can turn spell check off and perform the check spelling after …

Checking spelling and grammar in multiple languages can present unique problems, such as correctly spelled words being flagged as incorrect, or misspelled words in a different language not flagged as …

Note: Excel doesn't check spelling in cells that contain formulas, but you can spell check words in the formula, just select the words in the formula bar.

If Word finds a potential error, the Spelling & Grammar dialog box will open, spelling errors will be shown as red text, and grammatical errors will be shown as green text.

Right-click on a word with a red squiggly line underneath. Select the correct spelling from the list of suggestions. Or you can choose: Ignore All: Ignores the error and removes the red squiggly line. Add …

Word marks spelling, grammar, and stylistic issues with an underline. Right-click the underlined word, and then choose the suggestion you want, or learn more about the error and how to correct it.

Check grammar, spelling, and more in Word Microsoft Editor checks grammar and more in documents, mail, and the web

As you type, PowerPoint for the web lets you know when it detects possible spelling, grammar, or style mistakes by underlining the words.

In Word 2013 - Click File > Options > Proofing, clear the Check spelling as you type box, and click OK. To turn spell check back on, repeat the process and select the Check spelling as you type box.