Automatic Lead-convert in Salesforce

The following example will show you how to setup an automatic lead-convert process with a custom convert criteria.

The following auto lead convert process does not create duplicate contacts / accounts (it uses to lead's email & company name to find existing contacts & accounts - similar to our mass convert actions).
You can disable/enable the auto-duplicate detection and the creation of new opportunities (disabled by default)...

Creating an automated lead conversion process with a custom convert criteria:

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Process builder - automated lead convert criteria

Process builder - automated  lead convert process