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Correct me if I'm wrong, but I don't believe Google Photos stores pictures in original size anymore.

• zo1 5y ago
  It's a setting, so you can pick. It used to be from back when Google photos offered unlimited storage for compressed photos (that they don't offer anymore Iirc).
• NoPicklez 5y ago
  They do offer both a space saving setting which changes the quality and an original size option.