If I don't have printer, Can I generate posters?
Of course. Posteriza incorporates an option to generate poster in several JPEG image  files (these are similar of the images generated with a digital camera) instead of printing the poster.  These JPEG files can be taken to any digital print  service store where  we can obtain the desired poster by a reasonable price.

This way of printing the posters can be also usefully in the case you already have a printer, but want to save money in inkjet cartridges ;-)