High Definition Stencils is a graffiti technique invented by Paolo Cirio. The technique digitally creates special stencils for high definition full color graffiti using spray paint for the reproduction of pictures and graphics.

HD Stencils employs custom-made software and laser cutters. The final stencils provide a high level of detail through tiny cut-out holes of any geometrical shape. Just as in subtractive color printing, HD Stencils has the ability to reproduce full color pictures with four stencils for each color channel (CMYB). These stencils may be used on a range of surfaces, from small pieces of paper and canvas to large walls of buildings.

The stencils are digitally generated by a simple script coded in Processing, which converts bitmap images into distinct vector files that can be printed with laser cutter machines. This technique requires custom configuration to prepare the script for the images (to cut the paper) and the resulting stencils are then used to make graffiti. The artist has released the code and the instructions of his technique with an open source license to give everyone the opportunity to create their own HD Stencils.

Paolo Cirio uses the HD Stencils for conceptual street art works that transform reproductions of unauthorized snapshots of influential individuals into graffiti. By using HD Stencils to paint on both walls and paper, the high definition graffiti street art series takes the form of murals and wheat-pasted posters to the streets of several major cities.