How to join 2 jpegs together losslessly without decoding using a hex editor?

This is very much doable. I did it on a lot of Google map image tiles to join those and form a poster size image. There is a package for Unix called JPEG Tools for doing exactly this.

The program is called jpegjoin . Pure C source, with Windows binaries available. When compiled it creates a command line application which when run joins two jpeg images loselessly among many other things.

It does NOT de-compress any image, just merges the compressed data together and fixes the header accordingly. I used it to merge 100 images to create 50 strips and then merged those strips again to create a large image.

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