ResponsiveTestTool
ResponsiveTestTool previews websites at mobile, tablet, desktop, and TV screen sizes.
About ResponsiveTestTool
ResponsiveTestTool is a free, web-based tool for previewing websites across mobile, tablet, desktop, and TV screen sizes to assess responsive design. No signup or account creation is required to use the service. The tool offers utilities including screen rotation, scroll toggle, built-in W3 validation, shareable preview links, QR codes, and a responsive breakpoint cheatsheet. Users can also input custom pixel width and height values for preview screens.
Key features
- Preview websites across mobile, tablet, desktop, and TV screen sizes.
- Toggle screen rotation and enable/disable scrolling for previews.
- Generate shareable links and QR codes for responsive previews.
- Run built-in W3 validation on tested website pages.
- Set custom pixel width and height for preview screens.
- Access a responsive breakpoint cheatsheet reference.
Best for: Web developers, designers, QA testers, marketers, and site owners who need to verify cross-device responsive website layouts.
Good for
- No signup or account creation required to use the tool.
- Supports previewing across four common device categories plus custom sizes.
- Includes built-in utilities like W3 validation and shareable preview links.
ResponsiveTestTool at a glance
- Website
- responsivetesttool.com
- Category
- Development › Developer Tools
- Type
- Online tool
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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ResponsiveTestTool FAQ
Do I need to sign up to use ResponsiveTestTool?
No, the tool is free to use with no signup required.
What device screen sizes are supported for previews?
Previews are available for mobile, tablet, desktop, and TV screen sizes, with custom dimension options.
What utilities are included with the responsive testing tool?
Included utilities are screen rotation, scroll toggle, W3 validator, shareable links, QR codes, and a breakpoint cheatsheet.
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