IMb Barcode Validator
Detect Intelligent Mail barcodes and validate their structure — free count + validity; field decode in the USPS module.
Drop a document to analyze
or browse to choose a file
PDF · AFP · PCL · PostScript · IPDS · max 25 MB · no signup
FAQ
What is an IMb?
The Intelligent Mail barcode is the USPS barcode that encodes routing and tracking data on mailpieces.
Does this check full USPS compliance?
This tool decodes and validates structure; full USPS IMb compliance — its constant-weight symbol coding and 11-bit CRC (FCS), not Reed-Solomon — is part of the dedicated USPS module.