Mobile-Friendly Simulator
Preview any URL at 8 device viewports — iPhone SE, iPhone 15 Pro, Pixel 8, Galaxy S24, iPad Mini, iPad Pro 11", Laptop 13", Desktop FHD. See exactly how your site renders at each size.
X-Frame-Options: DENY to prevent iframe embedding (Google, Facebook, X, banks). If the preview is blank, the site blocks framing. The viewport check + Lighthouse audit work regardless of framing.What powers the Mobile-Friendly Simulator
8 device presets covering modern phones, tablets, laptops, desktops
Iframe-based live preview (real CSS, real JS executes)
Device-frame styling for visual context
Pixel-accurate viewport sizes from manufacturer specs
One-click device switching
Sandboxed iframe for security
Why the Mobile-Friendly Simulator is different
Browser-native
The Mobile-Friendly Simulator runs entirely in your browser. Input is processed locally — never uploaded, never logged, never cached anywhere outside your device.
No artificial limits
No daily quotas, no character ceilings, no "upgrade for more" walls. Every feature is the complete feature — the same on the first use as the thousandth.
Production-grade quality
Built to the same engineering bar as paid SaaS tools — accurate algorithms, audited logic, responsive design and accessibility-tested interactions.
Common use contexts
- Pre-launch responsive design QA
- Showing clients how their site looks on phones
- Debugging mobile-only layout issues
- Comparing how the same site renders on phone vs tablet vs desktop
Private and secure
Zero upload
All processing happens in your browser. Input is never transmitted, logged or cached.
Works offline
Once the page loads, the tool runs without an internet connection. No network calls happen during use.
No tracking
No accounts, no cookies for tool state. Only aggregate analytics count visits at the page level.