Definition
What is a blurhash?
Short answer
A compact placeholder representation of an image that displays while the full image loads.
Full definition
A blurhash is a short string (~30 characters) that encodes a heavily-blurred version of an image. The browser decodes it into a soft-color placeholder that appears immediately, then the real image fades in over the top once it has loaded. Blurhashes prevent the empty-grey-box flash of a slow image load and make galleries feel polished on slow connections.
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