For transactional email
Consider SMTP2GO for website-generated messages, form notifications, account notices, and other outbound system email.
Explore SMTP2GOAvailableFree browser-local analysis
CSS Optimization Checker
SiteTend CSS Optimization
Find blocking stylesheets, duplicate loading, imports, oversized blocks, font inefficiencies, and CSS organization risks.
Your input stays private.CSS and HTML are analyzed in your browser.
Paste CSS or stylesheet markup
Add CSS, HTML, style blocks, or link elements.
Review CSS risks
Start with blocking resources, imports, and repeated loading.
Your analysis will appear here
Paste CSS or markup and select Analyze CSS.
How to improve
Reduce unused work without obscuring ownership
Keep critical styles discoverable, remove dead rules, scope media-specific CSS accurately, and control font loading. Confirm heuristics with coverage, transfer, and render-timing measurements.
Questions
CSS Optimization Checker FAQ
What does the CSS Optimization Checker analyze?
It reviews stylesheet count, duplicate references, blocking patterns, inline styles, imports, selector repetition, font loading, size signals, and organization heuristics.
Are duplicate selectors always a problem?
No. Repeated selectors can support intentional cascade behavior. The checker identifies them for contextual review rather than assuming they are incorrect.
Should all stylesheets be combined?
No. Consolidation is useful only when it reduces critical requests without increasing unused CSS or weakening caching and loading boundaries.
Can SiteTend detect unused external CSS?
No. Version 1 does not fetch stylesheets or observe runtime coverage, so framework and unused-code findings remain heuristics.
Apply the result
From finding to verified fix
Interpret the finding
Review blocking and duplication findings in the context of the cascade. Repetition can be intentional and consolidation can hurt caching.
Common causes to inspect
- Multiple framework bundles
- Repeated component rules
- Imports and font declarations discovered after the main stylesheet
Practical next steps
- Measure stylesheet transfer and coverage
- Remove verified duplication
- Preserve cascade order and retest key layouts
What this check cannot prove
The checker cannot calculate runtime coverage, specificity interactions, rendering cost, or visual regressions.
Recommended resources
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