See your website on every device — instantly
Free responsive website checker. Paste any URL and preview it on iPhone, Android, iPad & desktop side by side. No signup, no install.
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What is responsive website testing?
Responsive website testing means checking how a website looks and behaves on different screen sizes — phones, tablets, laptops and desktops. A responsive website automatically rearranges its layout, resizes text and images, and keeps buttons tappable on every device.
Over 60% of web traffic now comes from mobile devices. If your site breaks on small screens — overlapping text, tiny buttons, sideways scrolling — visitors leave and Google ranks you lower. Testing on real device widths catches these issues before your users do.
How it works
- Paste your URL — any public website address.
- Compare devices — mobile, tablet & desktop side by side on 33 real viewports.
- Fix & share — scan the QR on your phone, copy a shareable link, or send the report to your developer.
Everything you need to test responsive design
Multi-device preview
Mobile, tablet & desktop side by side — spot breakpoint issues in one glance.
37 real device presets
iPhone 16 Pro Max, Galaxy S24 Ultra, Pixel 8 Pro, iPad Pro, MacBook Pro & more with accurate viewports.
Portrait & landscape
Flip any device instantly to test both orientations.
QR for real-device test
One-click QR code — scan and verify on your physical phone in seconds.
Shareable links
Copy a link with your URL & device pre-loaded. Send to clients or teammates.
AI issue detection soon
AI that auto-detects overlapping text, tiny tap targets & suggests fixes.
Device presets
37 accurate CSS viewports for the devices your visitors actually use.
Frequently asked questions
How do I check if my website is responsive?
Enter your URL above. Responsivly shows it on mobile, tablet and desktop side by side. If text overlaps, buttons are too small, or you must scroll sideways — those are responsive issues to fix.
Is Responsivly really free?
Yes — 100% free, no signup, no usage limits. Everything runs in your browser.
Why won't my site load in the preview?
Some sites block embedding with X-Frame-Options or Content-Security-Policy headers (banks, dashboards). Most regular websites work fine — or use the QR code to test on your real phone.
Can I test my localhost dev server?
Expose it over HTTPS with ngrok or Cloudflare Tunnel, then paste that URL.
Does this replace Chrome DevTools device mode?
No — it complements it. DevTools is great for one device; Responsivly compares several real widths at once, with shareable links and QR codes for real-device verification.
What screen sizes should I test?
The big three: 375px (mobile), 768px (tablet), 1280px (desktop) — they cover 95%+ of web traffic. Responsivly's multi-view shows all three at once, plus 33 specific device presets for precision.
Can I share my test with a client or teammate?
Yes! Hit the 🔗 Share button to copy a link with your URL and device pre-loaded. Anyone opening it sees the same preview — no account needed.
Found responsive issues? We fix them.
AKCLNT builds lightning-fast, fully responsive websites, AI chatbots & automation for startups and businesses.
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