Responsive Viewer
Responsive Viewer previews, screenshots, annotates, and compares website layouts across multiple screen sizes.
About Responsive Viewer
Responsive Viewer is a tool for checking how a website's layout looks across several screen sizes at once. It runs as a Chrome browser extension and also has an online version. Users place multiple screen previews on an infinite canvas, using a preset or a custom screen size, and can drag screens into different arrangements. Sync scrolling and navigation are available across the screens. Users can take a screenshot of a preview, add comments and drawings on top of it, and then share it or download it.
The core extension is free to install. The homepage describes a premium subscription that unlocks all available screens and all device mockups and removes ads. Specific subscription prices are not confirmed in this entry, and the mockup list is updated periodically.
Key features
- Preview a website on multiple screens simultaneously within an infinite canvas
- Use a preset screen layout or add a custom screen
- Set custom screen dimensions for any screen size
- Sync scrolling and navigation across previewed screens
- Drag and drop screens to organize the workspace
- Take screenshots of previews and add annotations and comments
Best for: Web developers and designers who need to check responsive layouts across different screen sizes.
Good for
- Shows several screen sizes in one view without repeated browser resizing
- Screenshots can be annotated with comments and drawings and then shared or downloaded
- The core extension is free to install
Watch out for
- All available screens and device mockups require the premium subscription
- The free version includes ads, which premium removes
Responsive Viewer at a glance
- Website
- responsiveviewer.org
- Category
- Development › Developer Tools
- Type
- Online tool
- Pricing
- Not confirmed. Check the site
- Platforms
- Browser extension, Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Responsive Viewer FAQ
Is Responsive Viewer free to use?
The homepage says Responsive Viewer is free. A premium subscription provides access to all available screens and removes ads.
Can I share screenshots taken in Responsive Viewer?
Yes. After taking a screenshot of a device mockup, users can add comments, share it with someone, or download it to their computer.
Can I test screen sizes that are not in the preset list?
Yes. Users can create a custom screen and set its dimensions to match any screen size they are working with.
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