Extension Tracker

Viewport Resizer: Ultimate Device Emulator & Website Testing Tool

80,000 users Rated 4.21 from 286 ratings Last updated 16 Dec 2025

By Malte Wassermann Live in the Chrome Web Store kapnjjcfcncngkadhpmijlkblpibdcgm Last checked 27 Sep 2026, 04:03 UTC

The listing

What the Chrome Web Store shows, as of the last check

Emulate devices, resize screens, and perfect your web design effortlessly with this cutting-edge testing and presentation tool.Summary from the listing
Developer
Malte Wassermann
Trader status
Not declared a trader under EU law
Category
Productivity › Developer Tools
First published
13 Sep 2013
Last updated
16 Dec 2025
Version
2.0.4
Size
134 KiB
Minimum Chrome
88
Languages
41 languages

Deutsch, English, Indonesia, Nederlands, Tiếng Việt, Türkçe, català, dansk, eesti, español, français, hrvatski, italiano, latviešu, lietuvių, magyar, norsk, polski, português (Brasil), português (Portugal), română, slovenčina, slovenščina, suomi, svenska, čeština, Ελληνικά, български, русский, српски, українська, עברית, العربية, فارسی, हिन्दी, ગુજરાતી, ไทย, 中文（中国）, 中文（台灣）, 日本語, 한국어

Open in the Chrome Web Store ↗ Download the CRX from Google ↗
Users over time As shown on the Chrome Web Store

Tracking began on 27 Sep 2026. The chart appears after the second check.

Show the numbers
CheckedUsersRatingRatings
2026-09-2780,0004.21286
Users, 7 days
–
needs a week of history
Users, 30 days
–
needs a month of history
Rank
#1,902
by users, of 264,254 extensions
In its category
#169
of 27,566 in Developer Tools

What changed

Every change found on a check, newest first

No changes found since tracking began on 27 Sep 2026.

What it can access

From the extension's manifest, in plain language

Every websiteIt can read and change your data on all the sites you visit.
Sites
  • <all_urls>Every website
Browser features
  • activeTabThe tab you're on, only after you click the extension
  • declarativeNetRequestBlock or change network requests, using rules
  • scriptingRun scripts on sites it can reach
  • storageSave settings and data in your browser

About this data

Collected from the extension's public Chrome Web Store listing. It's checked every week, because it has 1,000 or more users, and again whenever a new version appears. Last checked 27 Sep 2026, 04:03 UTC; next check around 3 Oct 2026.

We don't copy descriptions, screenshots or developers' contact details. How we collect the data

Cite this page

Extension Tracker. “Viewport Resizer: Ultimate Device Emulator & Website Testing Tool” (kapnjjcfcncngkadhpmijlkblpibdcgm). Chrome Web Store data, last checked 2026-09-27. https://extensiontracker.com/extension/kapnjjcfcncngkadhpmijlkblpibdcgm. Accessed 2026-09-27.
BibTeX
@misc{extensiontracker_kapnjjcfcncngkadhpmijlkblpibdcgm,
  title   = {Viewport Resizer: Ultimate Device Emulator & Website Testing Tool (kapnjjcfcncngkadhpmijlkblpibdcgm)},
  author  = {{Extension Tracker}},
  year    = {2026},
  note    = {Chrome Web Store data, last checked 2026-09-27},
  url     = {https://extensiontracker.com/extension/kapnjjcfcncngkadhpmijlkblpibdcgm},
  urldate = {2026-09-27}
}

The data is free to reuse under CC BY 4.0.