Quick answer
Por looks back to cause or through the means and path. Para looks forward to a destination, recipient, or purpose.
A reliable test is to identify the job of the word before translating from English.
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What each word does
por
through, by, because of, or for
Use por for cause, means, exchange, route, duration, and action on someone’s behalf.
para
to, toward, or in order to
Use para for destination, recipient, purpose, goal, and a future deadline.
How to choose
- por: Choose por if the sentence points to cause, means, exchange, route, duration, and action on someone’s behalf.
- para: Choose para if the sentence points to destination, recipient, purpose, goal, and a future deadline.
Examples
Enviei o arquivo por e-mail.
I sent the file by email.
Este presente é para você.
This gift is for you.
Common trap
Both often translate as “for.” Ask whether the phrase explains why or how, or points to where, whom, or what goal.
Practice it in context
Pick one sentence from your real life and write it twice: once with por, then once with para. If both versions feel possible, name the meaning shift.
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