Jampack – Optimizes static websites as a post-processing step
Hi! Jampack is a post-processing tool that takes the output of your Static Site Generator (aka SSG) and optimizes it for best user experience and best Core Web Vitals scores. As of today it can: - Optimize local images, CDN images or external images - Optimize above-the-fold vs below-the-fold - Limit images max width - Inline critical CSS - Prefetch links on scroll - Improve browser compatibility - Auto-fixes HTML issues - Warn for HTML accessibility issues - Compress all assets in the end It processes directly the static output so it's compatible with any SSG or framework. We are…
In plain words
Jampack is a post-processing tool that optimizes static website output from any static site generator for performance and user experience. It handles image optimization for local and external sources, inlines critical CSS, prefetches links, compresses assets, and auto-fixes HTML issues while warning about accessibility problems. The tool works directly on generated static files, making it compatible with any framework, and allows developers to focus on code quality while delegating performance optimization to the tool.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hi! Jampack is a post-processing tool that takes the output of your Static Site Generator (aka SSG) and optimizes it for best user experience and best Core Web Vitals scores. As of today it can: - Optimize local images, CDN images or external images - Optimize above-the-fold vs below-the-fold - Limit images max width - Inline critical CSS - Prefetch links on scroll - Improve browser compatibility - Auto-fixes HTML issues - Warn for HTML accessibility issues - Compress all assets in the end It processes directly the static output so it's compatible with any SSG or framework. We are intensively using it as a post-processing step to our Astro websites for example. With Jampack, we end-up focusing more on how simple, readable and maintainable our code is, throw images of any size, and let it optimize for maximum performance. We hope this can be helpful to lot of people! Cheers, Georges and the ‹div›RIOTS team!
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