How accurate are free online IQ tests?

I took one online for free and said I had an IQ of 139, which is considered very superior
I took a different IQ test that I had to pay for, and it said I had an IQ of 110, which is in the high average range, but I was also really tired when I took it

I consider myself pretty smart but I wouldn't consider myself gifted

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ShaythePanTransMan · 22-25, T

I only consider IQ tests administrated by licensed psychologists to be valid
The only thing my official IQ did for me was tell me I’m really smart but have nonverbal learning disability