SEO & Performance Tools
19 browser-based seo & performance tools. Pick one to get started — most run entirely in your browser.
Tools in this category
- SEO & Performance
Cache-Control Builder
Build a Cache-Control response header from your caching intent, with live explanations and copyable output.
Open tool - SEO & Performance
Cache-Control Explainer
Paste any Cache-Control header to get a plain-English breakdown of every directive, plus warnings for conflicts and mistakes.
Open tool - SEO & Performance
Canonical URL Checker
Compare a page URL with its canonical URL and flag common canonicalization problems, entirely in your browser.
Open tool - SEO & Performance
Compression Ratio Calculator
Compare original, gzip, and Brotli sizes to see compression ratios and percentage savings.
Open tool - SEO & Performance
Hreflang Generator
Generate hreflang link elements for locale and region combinations from a base URL and URL pattern — entirely in your browser.
Open tool - SEO & Performance
Image Savings Calculator
Compare image dimensions and formats in your browser to see transfer savings across page views.
Open tool - SEO & Performance
JSON-LD Validator Helper
Validate JSON-LD syntax and flag common structural omissions in your structured data — entirely in your browser.
Open tool - SEO & Performance
Page Weight Budget Planner
Set a total page-weight budget, split it across resource categories, and track actual sizes against each cap in your browser.
Open tool - SEO & Performance
Preload / Preconnect Generator
Generate preload, preconnect, dns-prefetch, prefetch, and modulepreload resource hints for your page head.
Open tool - SEO & Performance
Resource Size Calculator
Paste a list of JS, CSS, image and font resources to total them and see the size breakdown by category.
Open tool - SEO & Performance
Robots.txt Generator
Build a valid robots.txt with allow/disallow rules, crawl-delay and sitemap — with a live preview in your browser.
Open tool - SEO & Performance
Robots.txt Tester
Check whether a URL is allowed or blocked for a chosen user-agent under pasted robots.txt rules.
Open tool - SEO & Performance
Schema.org Generator
Build common schema.org JSON-LD structured data with guided fields and copy it straight into your pages.
Open tool - SEO & Performance
SEO Head Analyzer
Paste your page's head markup to find missing, duplicate, or conflicting SEO metadata — entirely in your browser.
Open tool - SEO & Performance
SERP Snippet Preview
Preview your title, description, and URL as a Google-style search snippet at desktop and mobile widths.
Open tool - SEO & Performance
Service Worker Cache Planner
Map asset and request categories to service-worker caching strategies and get ready-to-ship Workbox or vanilla code.
Open tool - SEO & Performance
Sitemap XML Generator
Turn a list of URLs into valid sitemap XML with live validation, copy, and download — entirely in your browser.
Open tool - SEO & Performance
Social Preview Tester
Preview Open Graph and Twitter Card metadata live, with length checks and copy-ready meta tags.
Open tool - SEO & Performance
Web App Manifest Generator
Build a valid web app manifest interactively with a live preview, installability checks, and copyable JSON.
Open tool