Upload portals reject files — compressor that hits an exact KB target

Many web forms, marketplaces and legacy portals enforce hard byte-size caps—commonly in the 50–500 KB range—so images that exceed those limits are rejected outright, causing failed uploads, manual re-uploads and lost conversions for e‑commerce sellers, newsrooms, insurance claims teams and government services. This problem maps to a large addressable market: roughly 200 million businesses spending an average of $40/year on image optimization and delivery, implying an $8.0B opportunity for improved upload workflows. You could build a lightweight JS + WebAssembly SDK with a server fallback that compresses and, where appropriate, transcodes images to AVIF/WebP/JPEG while using perceptual ML quality metrics and an adaptive parameter search to hit an exact KB target rather than a heuristic bitrate. Delivered as a pre‑upload “preflight” module and CMS/plugins, it would eliminate round trips and rejected files, reduce server egress and improve UX by maximizing perceived quality at a hard size cap. The timing is favorable: mobile‑first content and tighter size budgets make exact‑fit compression more valuable, browser WASM enables fast client‑side execution, and perceptual ML codecs let you squeeze more quality into a fixed byte budget; combined these trends support the market score (92/100) and revenue potential (88/100) you noted. To stand out you should emphasize guaranteed exact‑byte targets with perceptual quality bounds, low CPU/latency on typical mobile devices, and turn‑key integrations for marketplaces and government portals; realistic challenges include cross‑browser WASM performance, edge cases in highly detailed imagery, potential codec patent/licensing issues, and established competitors (Cloudinary, TinyPNG, browser encoders) that may meet some needs server‑side.