Scanned study guides, university lecture handouts, and second-hand exam papers often arrive covered in distracting neon highlighter marks that make clean reading or black-and-white printing difficult. This utility restores readability to scanned document images by filtering out fluorescent ink while keeping handwritten notes and printed dark text crisp.

The tool loads your scanned page onto an HTML5 canvas and runs an RGB channel filter tailored to the optical properties of fluorescent inks. Yellow highlighters show elevated red and green values with suppressed blue, while green and pink markers show distinct spectral spikes. By replacing pixels matching these color signatures with clean white canvas background, the tool cleans up your study notes in seconds with zero data leaving your machine.