Never Use a QR Code's Decoded Value As-Is — Error Correction Succeeding Does Not Guarantee the Value (archived 2026-08-30)

Abstract

QR code error correction is not a mechanism that guarantees the value is correct once correction succeeds. Using sample images and measurements from two different decoders, this article explains why a symbol can be read as a different value depending on where the damage lands, and what validation the business system on the receiving end needs. Archived version of https://comcomponent.com/en/blog/qr-decoded-value-validation/, as published on 2026-08-30. The live article is maintained and may change after this date. First published 2026-07-25.