Our free Page Speed Estimator provides a professional, high-performance solution to estimate your mobile and desktop page speed performance score, simulate page sizes, assets count, caching, and CDNs offline, 100% private directly within your browser. Engineered for maximum speed and absolute privacy, the tool operates entirely on the client side using secure local JavaScript processing—meaning your data never leaves your device and is never uploaded to any external server. Whether you are working on a desktop, tablet, or mobile phone, the responsive and premium interface delivers instant real-time results with zero wait times. Designed for daily productivity, it features fully configurable parameters, robust input verification, and offline capability to ensure a seamless, secure workflow.
Type in your page's CSS, JS, and offscreen image asset payload sizes in KB or MB.
Toggle performance optimizations such as browser caching, lazy-loading, and CDN support.
Instantly estimate your Lighthouse-grade Speed Index performance and follow diagnostic advice.
Checks technical setup configurations, canonical metadata links, regional hreflang tags, and core keyword distributions.
Configure search crawler depths, input custom domain pathways, and adjust meta-tag character limits to refine your SEO strategy.
Audit your target domains and content drafts with 100% security. No proprietary tags, URLs, or keywords are ever logged or shared.