SlingSite
Optimize your images and videos for your website in batch with full privacy. Slingsite will create compressed versions of your images and videos for all device resolutions.
About SlingSite
SlingSite is a web-based image optimization tool that accepts JPG, PNG, WEBP, and GIF uploads and generates nine output files per image: three sizes (Mobile at 450px, Tablet at 850px, Desktop at 1920px) in three formats (JPG, WebP, AVIF). Output is delivered as a zip file with named, organized assets intended for direct use in production websites.
The tool targets developers and site owners looking to improve page load speed, Core Web Vitals metrics such as Largest Contentful Paint, and SEO by serving appropriately sized and formatted images to different devices instead of a single oversized file. The site also provides an HTML5 picture element code snippet for implementing responsive image delivery using the generated files.
The source code is available, and the site includes comparison pages against Kraken.io and TinyPNG.
Key features
- Generates 9 image assets per upload: 3 sizes (Mobile 450px, Tablet 850px, Desktop 1920px) in 3 formats (JPG, WebP, AVIF)
- Smart analysis engine balances quality vs. file size based on visual complexity
- Delivers output as a tidy, organized .zip file ready for production
- Supports upload of JPG, PNG, WEBP, and GIF via click or drag-and-drop
Frequently asked questions
Why do I need separate mobile-sized images instead of just using the desktop version?
Downloading a 1920px desktop image on a ~390px phone forces the browser to fetch 25x more pixels than needed, which spikes LCP and hurts page speed. SlingSite's mobile versions are optimized for the 350px-450px screen range.
What image formats does SlingSite generate?
It generates AVIF (up to 50% smaller than JPG with superior quality), WebP (supported by 97% of browsers, ~30% smaller than JPG, supports transparency), and JPG as a universal fallback.
Will using SlingSite help my SEO?
Yes, because Google treats page speed as a ranking factor, and reducing image payload by up to 85% via AVIF and correct sizing leads to faster page loads and higher rankings.
What file types can I upload?
SlingSite supports JPG, PNG, WEBP, and GIF uploads.
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