Inkjet printers are printers that spray tiny droplets of ink onto the paper without stop, and the character representation for these printers matrix printers. Precursor of inkjet printers, technical, and medical devices that record measurements as ink curves. They were followed by the first inkjet printer, the Continuous-Ink-jet printers that use a continuous ink jet that was deflected electrostatically as needed. This method is – in an improved form – still used in some high-quality inkjet printers. In normal inkjet printers are only as required (Drop on Demand) droplets ejected from nozzles onto the paper to generate individual points (average size 0.4 to 0.3 mm). These droplets are formed either in the bubble-jet or piezo process. What is the resolution of inkjet printers achieved depends primarily on how many nozzles on the print head has and how they are controlled. Easy Printer reach about 300 to 360 dpi, 1200 dpi and more efficient. Softer curves obtained by different point sizes, a new variant of the bubble jet technology, the so-called drop modulation technology, which uses two heating elements, which influence the control of different droplet size.

Such printers are relatively inexpensive to purchase and quiet and deliver printing results in good to very good quality. Compared to other printing methods, the running costs are relatively high, in some cases, the price of a set of replacement ink reach and exceed the purchase price of the device or that is the purchase price of the device-dependent. The general rule is: more expensive printer, cheap ink, and vice versa. Prices here are not technically necessary, but by marketing. There are inkjet printers black and white and color printers (the latter are equipped with multiple print heads/ printer ink cartridges for the different primary colors).

Since printed in ink, there are some typical problems: the prints are often not fast to light and often do not (very) water resistant. Certain types of paper curled, some jewelry papers are completely unsuitable for ink jet printing because the ink does not dry to the touch and blurred. When not in use, the print heads dry out.