Free Affect or Effect Checker
Affect is almost always a verb (to influence). Effect is almost always a noun (a result). The checker below scans your text, locates every instance of either word, and flags ones that look like they're being used the wrong way — based on the surrounding context.
Flagged Issues
How the Affect or Effect Checker Works
The checker locates every occurrence of 'affect' or 'effect' in your text. For each match, it examines the surrounding words (articles, prepositions, modals) to guess whether the noun or verb form is expected. When the form looks wrong, the issue is flagged with a suggestion.
Rules & Best Practices
1Look for the article test
If 'the,' 'an,' 'a,' or a possessive comes right before the word, it should be 'effect' (noun). 'The effect,' 'an effect,' 'its effects.' Never 'the affect.'
2Look for the modal test
After 'will,' 'can,' 'might,' 'may,' 'would,' you need a verb — so use 'affect.' 'Will affect,' 'can affect,' 'might affect.'
3Side effects, not side affects
'Side effects' is the only correct form. The checker always flags 'side affects' as an error.
4Watch for the rare 'effect' as a verb
'To effect change' (meaning 'to bring about change') is correct — effect can rarely be a verb. The checker flags these for human review but does not auto-correct.
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