Developer builds free before/after image slider on Cloudflare Workers after imgsli went offline

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A game modder created imgi.co, a free before/after image comparison tool, after the widely used service imgsli went offline, leaving mod creators without a reliable way to showcase visual changes. The tool supports draggable sliders, shareable permanent links, iframe embeds, GIF/MP4/WebP exports, and comparisons of up to ten images at once. Built on Next.js 15 running on Cloudflare Workers via the OpenNext adapter, the project uses Cloudflare R2 storage — which charges no egress fees — as the key factor in keeping the service free and financially sustainable. Images are compressed using AVIF and WebP formats to minimize file sizes, while expensive encoding tasks are offloaded to a background worker to stay within Cloudflare's 10ms CPU limit per request. The developer has opened the tool to the public beyond game modding, calling it useful for AI upscales, photo edits, and any before/after visual comparison.

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