Developer builds browser-only image toolkit where no file ever touches a server

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A developer built SnappyKit, a suite of image tools including compression, conversion, cropping, and HEIC decoding, that processes every file entirely within the user's browser. The project uses Next.js 14, React 18, and TypeScript, relying on the Canvas API and WebAssembly to handle image operations client-side without any network uploads. To support Apple's HEIC format, which no browser can natively decode, the developer compiled the libheif library to WebAssembly and lazy-loads it only on the relevant page to avoid burdening other users. Hard browser limits on canvas dimensions and file size led to upfront validation checks, ensuring users receive clear error messages rather than silent failures. The strict no-upload constraint shaped every feature decision, with any functionality that required a server simply left out of the product.

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