ZXing or “Zebra Crossing” is an open source multi-format 1D/2D barcode image processing library that’s been implemented in Java, and also comes with ports to other languages. It currently supports the following formats:
UPC-A and UPC-E
EAN-8 and EAN-13
Code 39
Code 93
Code 128
ITF
Codabar
RSS-14 (all variants)
RSS Expanded (most variants)
QRCode
Data Matrix
Aztec ('beta' quality)
PDF 417 ('alpha' quality)
MaxiCode
ZXing is made up of several modules, including a core image decoding library, JavaSE-specific client code, and Android client Barcode Scanner. ...
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File2QR is an Android app that let you encode any small file on the filesystem to a QRcode. Conversely, you can decode the encoded file from the generated QR, with mobile's camera. File2QR is built on ZXing library.