Reading the text off a card is half the job. The other half — checking the number came through and noticing the date did not — is what this does.
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It recognises an Aadhaar card, a PAN card, a bank passbook or cheque, an invoice, a marksheet and a driving licence, and pulls out the fields each of those carries. Nothing is guessed: a number is reported only when it matches the shape its issuer defines, and where the issuer put a check digit in it — Aadhaar, PAN, GSTIN, IFSC — that check is run. Anything that did not come through is named, so you find out now rather than after the form comes back.
What kind of document it is — Aadhaar, PAN, a bank passbook, an invoice, a marksheet, a driving licence — and the fields it found, with a list of the ones it expected and did not.
Yes. An Aadhaar number is checked against its own check digit, a PAN against its format, an IFSC and a GSTIN against theirs. A number that fails is reported as failing rather than quietly accepted.
No. It corrects letters that optical recognition confuses — O for 0, I for 1 — and stops there. Guessing a digit would produce a number that passes every check and belongs to somebody else.