Both amazed at and amazed by are correct. Amazed at usually focuses on the surprising thing, while amazed by often highlights the cause, person, or action creating the feeling.
Use amazed at for a fact, result, or situation that surprises you. Use amazed by for the person, skill, event, or action causing the amazement. In many contexts, both are possible.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use at with facts, results, behaviour, or situations.
Use by when focusing on what or who creates the feeling.
At is common before how, what, or that clauses.
By often appears with abilities, achievements, and performances.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
Both amazed at and amazed by are standard English.
✓ She was amazed at the change. / She was amazed by the change.Choose at for the surprising fact and by for the source or cause when the distinction matters.
✓ I was amazed by her speech.Amazed normally needs a preposition before the object.
✕ I was amazed the result. ✓ I was amazed at the result.Choose the expression that matches the intended meaning.
Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.
Often yes, although the emphasis may change slightly.
By is more common when the focus is the person causing amazement.
It is not standard in this meaning. Use amazed at or amazed by.
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