What happens when you flip exactly one bit in a file?

An open-source project called Bit Flip Lab provides a visual, deterministic fault-injection laboratory for studying the effects of changing exactly one bit in a file, following a select-mutate-decode-measure-observe workflow. The project reports experiments in which a single bit produced a measurable pixel change and another crossed a structural boundary and caused a PNG decoder failure, with the full visual demo, experiments, architecture, and methodology published on GitHub. The tool classifies consequences across raw byte changes, structural validity, integrity checks, and decoded or rendered output.