SEO • Core Web Vitals
Website PageSpeed Checker
Lighthouse-style performance report with scores, Core Web Vitals metrics, opportunities, and diagnostics.
Lighthouse-style performance report with scores, Core Web Vitals metrics, opportunities, and diagnostics.
Responsible use: This tool provides informational results only and does not guarantee security, accuracy, or completeness. Always verify critical information through official sources and follow responsible disclosure practices.
Analyze mobile or desktop performance using Google PageSpeed Insights / Lighthouse. Get an overall performance score plus Core Web Vitals-style metrics to prioritize speed fixes.
Website PageSpeed Checker is designed for everyday tasks where speed and simplicity matter. Whether you are handling a single file or working through a batch, ConvertMastery keeps the workflow straightforward with clear settings and instant downloads.
Audit landing page speed before launch. Compare mobile vs desktop performance. Track Core Web Vitals-related metrics. These are among the most common reasons users choose this tool on ConvertMastery.
For the best outcome, start with a high-quality source file when possible. If you are preparing images for the web, consider converting to WebP or compressing after conversion. For documents, review the output before deleting originals. When privacy matters, prefer settings that strip metadata and use browser-based processing when available.
ConvertMastery is updated regularly to support modern formats and browsers. If you need help, visit our documentation guide or browse related tools linked below. Processing is private and on-the-fly — results are not saved to our servers.
Important: This tool provides informational results only and does not guarantee security, accuracy, or completeness. Always verify critical information through official sources and follow responsible disclosure practices.
Public HTTP/HTTPS URLs.
Some tools require brief server processing for advanced features. When server processing is used, files are handled securely, processed in memory, and not stored permanently. We do not sell or share your file data with advertisers.
Lighthouse runs a full lab test and often takes 15–45 seconds.
Optional. Set GOOGLE_PAGESPEED_API_KEY for higher Google API quotas.