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
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User Growth Over Time
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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
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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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5
If you're a developer and you and need effective viewport viewing of multiple responsive viewports but don't want to open your Inspector every time to do so, then this application is what you need. As someone working on a MacBook Pro 15.4 inch it solved the pain of re-opening inspector or a new window when going into smaller viewports. Huge thank to the developer, thoroughly impressive work and as a full stack developer this tool has made my life easier in so many way. Best, Panoply, Amsterdam
Simple et très bien pour tester l'affichage responsive
Unfortunately, it's not a viewport resizer but viewport SCALER :( It's doesn't resize anything, just makes pages smaller proportionally. It looked pretty promising but currently it's not useful. Anyway, thanks for sharing it.
Amazing.
why iframe?
Ottimo plugin. C'è da dire che dall'ultimo update i dispositivi sono rimasti alla risoluzione dell'iPhone 5. Vi consiglio un aggiornamento perchè questo plugin è il migliore di tutti e per essere da 5 stelle serve un update ;)
Simply doesn't work. No reaction after clicking button in Chrome.
Muito Bom!!!!
I'm not a developer. I use this extension to resize the video player on Twitch. Combined with their "Theater Mode", you can resize the player to fit the streamer's resolution. This avoids further quality degradation caused by upscaling a 720p video to a higher resolution, and the ability to manually input a resolution makes it much easier to match the resolution of the stream.