How are transformations counted in the Filestack system?

The way transformations work, and the caching system works, is that the first time a URL is used to make a conversion, we tally one conversion and cache the result. Then the next time that same url is requested, we return the cached version and no conversion is tallied. We maintain the cached version for 30 days. After 30 days, the cache of that transformation is purged, so on day 31 if that same url is requested, we tally another conversion against your plan limit and cache a new version of the converted file.