"Convince" = to cause someone to believe or think something (focus on belief); "persuade" = to cause someone to do something (focus on action).
Verb: to cause someone to believe or accept that something is true, through argument or evidence. The result of "convince" is a CHANGE IN BELIEF or OPINION. "I convinced her that the plan was safe" = I caused her to BELIEVE the plan was safe. "Convince" focuses on WHAT someone thinks.
After showing her the statistics, he finally convinced her that the investment was too risky.
I am not convinced that this approach will solve the underlying problem.
It took three separate demonstrations to convince the skeptical scientist that the device actually worked.
Verb: to cause someone to do something through argument, emotional appeals, or incentives. The result of "persuade" is an ACTION. "I persuaded her to try the plan" = I caused her to TRY the plan (I got her to DO it). "Persuade" focuses on WHAT someone does. From Latin "persuadere" = to make someone agree to something.
She persuaded her reluctant colleague to present at the conference by offering to co-author the paper.
Nothing could persuade him to leave the house during the storm — he refused to budge.
The salesperson persuaded the hesitant couple to upgrade to the premium package with a limited-time offer.
Common mistake
The most common error: "convince someone to do something." In strict prescriptive English, CONVINCE is followed by "that" or "of" (it changes a BELIEF), and PERSUADE is followed by "to" + infinitive (it triggers an ACTION). "I convinced her to go" = widely accepted in modern usage, but in strict formal use it should be "I persuaded her to go" (got her to act). "I convinced her that it was a good idea" = correct; the "that" signals a change in BELIEF. In everyday practice, both verbs are used with "to" without criticism.
Trick to remember it
CONVINCE = change a CONVICTION (what someone thinks or believes). PERSUADE = move someone toward ACTION (what someone does). Grammar test: CONVINCE + that/of (belief). PERSUADE + to do (action). "I convinced her THAT the plan was safe" (she now BELIEVES it). "I persuaded her TO try the plan" (she now ACTS on it). If the outcome is a belief, use CONVINCE. If the outcome is an action, use PERSUADE. In everyday speech, "convinced to do" is accepted — but in formal writing, "persuaded to do" is the technical choice.
Quick rule
Convince = to change what someone BELIEVES (followed by "that" or "of"). Persuade = to get someone to ACT (followed by "to" + infinitive).
Did you know?
The prescriptive rule "do not use convince with to + infinitive" was particularly insisted upon by 20th-century style guides (including Fowler and the AP Style Guide). However, modern corpus linguistics shows "convinced to do" appearing frequently in formal 19th-century English writing. Modern prescriptivism has relaxed: the Chicago Manual of Style (17th edition) no longer flags "convince to do" as an error. The believe/act distinction remains useful for precision, but "convinced to" is no longer forbidden.
Exercise 1 · Pick the right one
After presenting extensive data and case studies, the researcher finally _____ the committee that the new approach was scientifically sound.
Exercise 2 · Pick the right one
She spent an hour on the phone _____ her elderly father to install the security updates on his computer.
Exercise 3 · Form the word
Convince = to change what someone BELIEVES (followed by "that" or "of"). Persuade = to get someone to ACT (followed by "to" + infinitive).
The most common error: "convince someone to do something." In strict prescriptive English, CONVINCE is followed by "that" or "of" (it changes a BELIEF), and PERSUADE is followed by "to" + infinitive (it triggers an ACTION). "I convinced her to go" = widely accepted in modern usage, but in strict formal use it should be "I persuaded her to go" (got her to act). "I convinced her that it was a good idea" = correct; the "that" signals a change in BELIEF. In everyday practice, both verbs are used with "to" without criticism.
CONVINCE = change a CONVICTION (what someone thinks or believes). PERSUADE = move someone toward ACTION (what someone does). Grammar test: CONVINCE + that/of (belief). PERSUADE + to do (action). "I convinced her THAT the plan was safe" (she now BELIEVES it). "I persuaded her TO try the plan" (she now ACTS on it). If the outcome is a belief, use CONVINCE. If the outcome is an action, use PERSUADE. In everyday speech, "convinced to do" is accepted — but in formal writing, "persuaded to do" is the technical choice.
Bryan López
Founder of SpeakUP Academy