Good question — I’ve had to deal with this when we were implementing an on-premise OCR solution last year. What I found is that running it locally does give you more control, but it also means you can’t rely on a vendor’s PCI compliance certificate alone. You need to prove that your servers, storage, and even the way you transmit data internally meet PCI DSS standards
https://ocrstudio.ai/bank-card-scanner/. It can get tricky when your IT department doesn’t already have the right monitoring and logging in place. For us, one of the deciding factors was that an on-premise setup avoided sending sensitive card data over the internet, which reduced exposure. But the trade-off was extra responsibility for audits and documenting security practices.