Free Cross-Browser Compatibility Checker
Check web layout rendering issues on iOS Safari, Chrome, Firefox, and Edge engines with deep diagnostic checks.
How to Use Instructions:
- Input page URL to audit rendering engine issues.
- Select target browser engines (WebKit/Safari, Blink/Chrome, Gecko/Firefox).
- Click Check Compatibility to detect unsupported CSS properties or flexbox bugs.
Engine Audit Results
Engine Compatibility Status
CSS Prefix & Property Check
Engine Diagnostic Log:
Related Free Tools
Continue with related JunctionTools utilities: Mobile UX Checker · PageSpeed Analyzer · UX Layout Evaluator.
About This Tool
Use a structured compatibility checklist to review how a website feature may behave across common browsers and viewport environments. It helps surface potential differences before a release.
How to Use It
Provide the page or feature information requested by the checker and review the browser-specific findings. Reproduce important issues in the actual browser versions that your audience uses.
How It Works
Browser compatibility depends on standards support, JavaScript APIs, CSS behavior, rendering engines and device conditions. Automated checks can identify known patterns but cannot replace real browser testing.
Practical Example
A feature using a newer browser API may work in Chromium-based browsers but require a fallback for older environments. Testing the actual API and fallback path reduces release surprises.
Frequently Asked Questions
Does this test every browser version? No. Browser versions and platform combinations change continuously.
Can a compatibility result guarantee production behavior? No. Real-device testing is still required for critical features.
What should I test besides desktop browsers? Include mobile browsers, touch input, viewport changes and network conditions relevant to your users.