Certify vs Guarantee - What's the difference?

As verbs the difference between certify and guarantee

is that certify is to attest to as the truth or meeting a standard while guarantee is to assure that something will get done right.

anything that assures a certain outcome.

to attest to as the truth or meeting a standard

* (to attest as to) attest, witness, vouch for, approve, confirm

* certifiable * decertify

(en noun)

Anything that assures a certain outcome.

Can you give me a guarantee that he will be fit for the match?

A written declaration that a certain product will be fit for a purpose and work correctly.

The cooker comes with a 5-year guarantee .

A person who gives such a guarantee; a guarantor.

(South)

The person to whom a guarantee is made.

(d)

To assure that something will get done right.

To assume responsibility for a debt.

To make something certain.

The long sunny days guarantee a good crop.

* assure * warrant