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A font test without hinting (upper rows) and with hinting (lower rows) at both true size and 400% scaling. Note the increased edge contrast with the hinted text but more faithful character shape and more natural inter-character spacing in the unhinted text.

Font hinting, also known as instructing, is the use of mathematical instructions to adjust the display of an outline font so that it lines up with a rasterized grid. At low screen resolutions, hinting is critical for producing clear, legible text. It can be accompanied by antialiasing and (on liquid crystal displays) subpixel rendering for further clarity.