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    <p>I don't know all formats so I can't say which is best. </p> <p>Some of the 1D barcodes you mention (UPC/EAN) support only a small number of numeric characters. I know Code 128 supports variable length alphanumeric values, so that probably is a good 1D candidate.</p> <p>Some barcode readers don't support 2D barcodes, this is usually a reason to use 1D. </p> <p>Of 2D you should see if there is a symbology that does not require the barcode to be a square, because that would limit your maximum size to 1.5 by 1.5 inches.</p> <p>There are several websites that let you create barcodes as images - perhaps you should just create a PDF containing those and fax them to see what happens.</p> <p>I don't know of any free libraries to render them with; there are also <a href="http://www.dafont.com/code-128.font" rel="nofollow noreferrer">fonts</a> out there that allow creating 1D barcodes, and you can <a href="https://stackoverflow.com/questions/2288246/how-can-i-bundle-a-font-with-my-net-winforms-application">embed these fonts into your winforms application</a>. </p> <p>EDIT: 200 dpi on 8x1.5 inches would give you 1600 dots horizontally and 300 dots vertically to work with. A code128 barcode with a bar width of 1 pixel would come out at under 1400 dots.</p> <p>On the <a href="http://en.wikipedia.org/wiki/QR_code#Storage" rel="nofollow noreferrer">wikipedia page for QR</a> there is an example that takes up to 174 characters that has a size of 57x57 and high error correction. If I'm not mistaking, each dot could be represented by 5x5 pixels in 200dpi.</p>
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    1. POBest Barcode Symbology for my Application
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    1. USCommunity
    1. USC.Evenhuis
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    1. COI have eliminated UPC,EAN from my list. Also I have eliminated code 39 as code 128 has better data density than code 39. But I would like to know the size of a 128 barcode that can encode 120 characters with 200dpi.<br/> The barcode reader will be decided only on the basis of the barcode which will be used in my application. <br/> Barcode fonts are used for creating low data density barcodes such as Code 39. So I need to find a good library in c# for barcode generation.
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    2. COUpdated my answer with dpi estimates, you'll have to verify them though, my calc.exe skills aren't that good.
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