Lite-Weight, Low Color, Smallest 1×1 Pixel Graphic Formats

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One pixel graphic files, are mostly used now-days in some server-response, there are better some alternatives, such as responding with HTTP status 204 NO-CONTENT, which means the server successfully processed the request, but is not returning any content,
its usually used as a response to a successful delete request, but as alternative to responding with one-pixel size image, Google is going that way in some of the console-API services…
…but anyway, responding with an image, is still, the more common-way.

I’ve include some of the non-standard formats (such as PDF), a possible use is in a web-application where, by default, process a image-based-pdf, this way you can use/process/return the following (a.k.a minimal one).

extsizebase64
GIF37 Bytes
BMP66 Bytes
ICO78 Bytes
PNG135 Bytes
TIFF226 Bytes
JPG332 Bytes
PCX899 Bytes
PDF1372 Bytes