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Neroidea

Free browser tools — HEIC converter, seller fee calculators

FreeProductivityListed Oct 16, 2026

About Neroidea

Neroidea is a free browser toolkit that runs entirely client-side — no account, nothing uploaded. Batch HEIC conversion (JPG/PNG/WebP/PDF) with EXIF preserved, decoded in-tab via a WASM build of libheif. Seller fee calculators for six marketplaces (Amazon FBA, Etsy, eBay, Depop, Poshmark, Mercari) kept in sync with 2026 official rates. Daily games (Promptle, Math Party, Magic Cube) and a curated gallery of 1,100+ AI artworks published with the exact prompts behind them.

What Neroidea does

AINave analysis

Convert HEIC photos in batches, estimate marketplace seller fees, and browse AI image prompts, all inside a browser tab without uploads.

Best for
Photographers and phone users with HEIC photosMarketplace sellers on Amazon, Etsy, eBay and similar sitesPeople seeking AI image prompt ideas
Use it to
  • Batch converting a camera roll to JPG, PNG, WebP or PDF
  • Preserving EXIF metadata during image conversion
  • Estimating fees for marketplace listings
  • Copying prompts behind AI-generated images
  • Playing short browser games during a break

Based on Neroidea's listing and website.

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