What is the difference between ISNULL and ISBLANK in Salesforce

Question

Can someone explain when to use ISNULL versus ISBLANK? I’m not sure which one to choose for different field types

Answer 1

In Salesforce, the key difference between ISNULL and ISBLANK is that ISBLANK is better for text fields, while ISNULL works best for non-text fields. Here is the difference:

Function	Usage	When to Use
ISBLANK	Returns TRUE if a field is empty or contains only spaces	Best for text fields, long text areas, and formula fields where you want to check for empty or blank entries
ISNULL	Checks if a field has no value (null)	Useful for non-text fields, like date fields; always returns FALSE for text fields, even if empty
Recommendation	Use ISBLANK for new formulas as it works for more field types	ISBLANK can be a reliable replacement for ISNULL in most cases

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