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To remain attached, it must maintain structural integrity under force, but to what extent and how it does so remain unclear. Under spindle forces, we find using super-resolution microscopy that inner (CENP-A) and outer (Hec1) metaphase kinetochores undergo correlated, large-scale (1 \u00b5m) deformations along the force axis, suggesting dynamic, relative sliding of parallel protein linkages. Kinetochore shape changes can be asymmetric, with centromere-facing \u201ctails\u201d correlating with hyperstabilized microtubule attachments. Applying microneedle pulling forces, we demonstrate that kinetochores are elastic, stretching under force and relaxing in seconds afterward. Finally, we show that SMC2 depletion results in more variable kinetochore deformations, despite maintained elasticity, and in reduced microtubule attachment stability. Thus, the kinetochore is structurally highly dynamic, requiring a stable centromere base to maintain structure and function under force. 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