Pretty sure everything is indie on itch.io but just in case you want something extra indie.
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PNG, or Portable Network Graphics is a common image file format that is lossless, can contain an transparency channel, and compressed. An ideal format for distributing static assets without any loss in quality.
Explore game assets tagged Indie and PNG on itch.io · Sell your game assets on itch.io to have them show up here.
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