What is Screen Size Simulator?
Screen Size Simulator is a free online tool that preview sites on mobile/tablet. Developers and webmasters use it to speed up workflows without installing any software. It works entirely in your browser — there is nothing to download, no account to create, and no usage limits. Your data stays on your device, which makes it both fast and private.
Whether you need it once or use it every day, screen size simulator gives you instant results with a single click. It is part of KamiWeb's collection of Website Tools — all free forever.
How to use Screen Size Simulator
Using the screen size simulator could not be simpler. Follow these steps:
- Enter your input in the screen size simulator box above.
- Click the "Preview" button.
- Get instant results — copy them or download where available.
- No signup, no waiting, no catch. Use it as many times as you like.
Why use KamiWeb's Screen Size Simulator?
- 100% free forever — no hidden charges, no premium tier, no credits.
- Private by design — everything runs in your browser; nothing is uploaded to any server.
- No signup needed — open the page and start using it immediately.
- Works on all devices — mobile, tablet and desktop, with a responsive layout.
- Fast results — optimized code means answers in milliseconds, not seconds.
Tips for best results
- Bookmark this tool — developers end up using it far more often than expected.
- Double-check output before pasting into production code.
- Works offline once loaded, since everything runs in your browser.
Pro tip: combine screen size simulator with our url encoder / decoder for even better results. Many users also find the base64 encoder / decoder helpful for related tasks.
Frequently asked questions
Is Screen Size Simulator really free?
Yes. The screen size simulator is completely free with no limits on usage. KamiWeb keeps all tools free forever — no account, no subscription, no catch.
Do I need to install anything?
No. The screen size simulator runs entirely in your web browser using JavaScript. It works on Chrome, Firefox, Safari and Edge on any device.
Is my data safe?
Yes. Everything is processed locally in your browser. Your input is never sent to KamiWeb servers or any third party, so you can safely use it for sensitive content.
Can I use it on mobile?
Absolutely. The screen size simulator is fully responsive and works smoothly on phones and tablets, with touch-friendly controls.
Related Website Tools
Try these other free website tools from KamiWeb: