I never saw that before. (Simple past) I've never seen that before. )
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I never saw that before. (Simple past)
I've never seen that before. (present perfect.)
bee airis it I never saw that before, or, I have never seen that before
In most situations you're safer with "I have never seen that before".
The opposite, by the way, is "I have already seen that".
Contracting "I have" to "I've" is so common that you should learn to use "I've" as well.
CJ