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Higher the stability of conjugate base higher is the acidity.

So, Acidic Strength order is HCOOH>C6H5COOH >CH3COOH

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How to know the stability of the conjugate bases.
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Base strength of a species is its ability to accept H+ from another species. The greater the ability of a species to accept a H+ from another species, the greater its base strength.

For acids: the stronger the acid, the smaller the pKa

For bases: the stronger the base, the larger the pKa

For example: In HCOOH the conjugate base is HCOO^- which is more stable as it accept H+

For More details see here -

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