Responsive Viewer
Developer Tools
Show multiple screens once, Responsive design tester
Users
400K
Rating
4.2
Reviews
348
7D Growth
+100K|33.3%
Cooling signalUnknownHigh-risk permissions
Viewport Resizer: Ultimate Device Emulator & Website Testing Tool
Emulate devices, resize screens, and perfect your web design effortlessly with this cutting-edge testing and presentation tool.
Users70KCurrent public install base
Rating4.2Store average score
Reviews285Public review volume
Manifest versionV3Extension platform version
7-day growth-10KNet users gained this week
7-day growth rate-12.5%Relative weekly velocity
Preview
6 assetsViewport Resizer: Ultimate Device Emulator & Website Testing Tool Media preview
Trend
User growth trend
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User Growth Over Time
Rating trend
7-day rating trend
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7-day rating change
Start
4.21
Latest
4.21
7-day rating change
0.00
2026年7月15日2026年7月21日
Growth overview
Daily, weekly, and monthly growth
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1-day growthNo data
----7-day growthDeclining
-10K-12.5%30-day growthNo data
----Technical snapshot
Version, languages, and crawl freshness
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Version2.0.4
ManifestV3
Size134KiB
Languages41Deutsch / English / Indonesia +38
Published
Store updated
Last crawled
DeutschEnglishIndonesiaNederlandsTiếng ViệtTürkçecatalàdanskeestiespañolfrançaishrvatski
Overview
Product summary
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Enhance your web design experience with our dynamic testing and presentation tool, designed to create, test, and showcase your digital experiences on any device, from wearables to very big screens. Customize your workspace fully and use or create your own device mockups, explore various display resolutions, and harness advanced emulation features like touch fingerprint simulation, user-agent emulation, and breakpoint guide, all within a professional-grade environment built for high-quality development and debugging. Push your limits with an intuitive zoomable workspace, precise ruler and grid tools, and a sleek presentation mode called 'Coffee Mode' — think of this tool as a first-level approximation of how your digital experience looks and feels across multiple devices.
Limitations: While our tool provides comprehensive device simulations, it does not replace the need for physical device testing.
Reviews
Recent review snapshot
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Store average score4.2Chrome Web Store aggregate rating, including ratings without synced review text
Synced text average4.1Average computed only from synced review bodies below
Reviews with text168Synced review bodies
Total ratings / reviews285Chrome Web Store public rating/review count
Store average score: 4.2. The bars below are calculated from synced review text only, so they may be empty for extensions that have public ratings but no synced comments yet.
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Не работает
Best extension for responsive design testing.
it does not resize the browser window BUT On every second click it was opening shady websites, probably malware.
Es muy bueno, a veces con alguna versión se puede trabajar pero en general es bueno
This tool is by far the best in its category. I love the "Animate" option that allows you to instantly test your work on ALL screen sizes, from the very small smartphone screen to the very large desktop screen, with a single mouse click. Congratulations to Malte Wassermann, creator of "Viewport Resizer - Responsive Testing Tool": Thank you Malte, your work is fantastic!
Useless. Clicking it just shows a link to the stupid Chrome web store, options and inspect are greyed out. No functionality. No instructions. No point.
СУпер
I did not know this tool existed. Exactly what I wanted !! Great
very halpefull and Amazing extension
Please Improve the toolbar icon, y really ugly!, the extension, it's amazing, contrats. (4 stars because of the ugly toolbar icon haha)