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Neroidea
Free browser tools and games — HEIC converter, seller fee calculators, daily puzzles.
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About this project
Neroidea is a free browser toolkit that runs entirely client-side: batch HEIC conversion (JPG/PNG/WebP/PDF) with EXIF preserved and nothing uploaded, seller fee calculators for six marketplaces with 2026 official rates, daily games (Promptle, Math Party, Magic Cube), and a curated gallery of 1,100+ AI artworks with the exact prompts behind them.
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