How Zalgo Text Works: Unicode Combining Characters Stack to Create Glitchy Effects

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Zalgo text is a visual effect produced by layering multiple Unicode combining characters onto standard letters, causing text to appear distorted or corrupted. Combining characters are designed to modify a base character — for example, adding an accent — but stacking many of them vertically creates the chaotic, stretched appearance associated with Zalgo. Generators can control the intensity and position of these marks, ranging from subtle to extreme distortion. The same Zalgo string can render differently across operating systems, browsers, fonts, and text engines due to varying Unicode support. Developers should be aware that while Unicode normalization helps standardize text, it is not a reliable way to strip Zalgo, since combining marks are legitimate characters used in many writing systems.

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