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Type a website address, or paste your HTML or open an .html file.
WAVESPEED AI SCREEN SIZE SIMULATOR Your code stays on your device
100% FREE
Screen Size SimulatorCompare your page on phone, tablet and desktop sizes at once.
Put a phone, a tablet, a laptop and a desktop next to each other and see your website or HTML in all of them at the same time.
Add any of more than 40 screen sizes, rotate them, scroll them together and save a screenshot of each in one ZIP file.
40+ screen sizesSide by sideScreenshots in a ZIP
No sign-up No proxy No watermark
Loading the tester…
Pasted HTML stays in your browser. Websites load directly from their own servers.
THREE SIMPLE STEPS
How to use the Screen Size Simulator
Choose the screens
Start with phone, tablet, laptop and desktop, then add, remove or rotate screens.
Compare and capture
Scroll the frames together, look for content that doesn't fit and save screenshots of your HTML.
WaveSpeed AI
From the layout to the visuals
When the page works at every size, create the images and clips it needs with WaveSpeed AI.
Image Generator
Make hero images, illustrations and banners in any aspect ratio.
Video Generator
Turn a product shot into a short clip for the landing page.
3D Generator
Turn a product photo into a 3D model for an interactive page.
- 1,000+ AI models
- Image, video and 3D
- Pay as you go
$1 in free credits for eligible new accounts. No card needed. Generators have separate account and credit requirements. The Responsive tester is free.
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Screen Size Simulator FAQ
How do I test my site on different screen sizes?
Enter your site's address or paste your HTML, and see it on a phone, a tablet, a laptop and a desktop side by side. Add more than 40 screen sizes, rotate them and scroll them together.
Are the sizes exact?
Yes. Each frame has the screen's width and height in CSS pixels, the unit your CSS uses, so breakpoints switch exactly where they would.
Can I use a size that isn't listed?
Yes. Switch to one device, choose Custom size and type a width and height, or drag the frame's edges.
Why does a website stay blank?
Some sites choose not to be shown inside other pages. Open "Why is it blank?" to check the site's headers, or paste the page's HTML instead.
Is it free?
Yes. No account, any number of screens, and no watermark on screenshots.
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Screen Size Simulator
40+ screen sizes · Side by side · Screenshots in a ZIP