Reproducing a reported layout bug
A bug is filed at a specific width. Set that exact viewport and see the broken layout for yourself instead of guessing at the cause.
Responsive TestingComing Soon
Test Every Viewport. Stay in Flow.
Preview your web application at configurable viewport dimensions and switch between saved presets.
This extension is not published yet. An installation link will appear here once the Chrome Web Store listing is live.
app.example.dev/pricing
W768
H1024
Apply
Presets
Desktop1440 × 900
Laptop1280 × 800
Tablet768 × 1024
Mobile390 × 844
Tablet · 768 × 10243 breakpoints
Overview
The problem it solves
Viewport Resizer lets you change the size of the page you are working on without leaving it. Set an exact width and height, jump to a common desktop, tablet, or mobile size, and save the dimensions you keep coming back to. It is a small tool for a repetitive task: checking that a layout still holds up at the sizes your users actually have.
Test layouts without leaving the page — built to fit into an existing debugging workflow rather than replace it.
Capabilities
What it does
Feature areas reflect the extension's intended scope. Individual capabilities are refined as the tool develops.
Custom dimensions
Enter an exact width and height when you need to reproduce a specific reported size.
Reusable presets
Save the viewport sizes you test most often and return to them in one click.
Common device sizes
Start from familiar desktop, tablet, and mobile dimensions instead of guessing.
Responsive layout checks
Watch breakpoints, grids, and navigation patterns respond as the viewport changes.
Quick switching
Move between saved sizes without reloading the page or losing your place.
Keyboard-friendly
Adjust and cycle through presets without reaching for the mouse.
How It Helps
Realistic developer scenarios
These are the kinds of situations the extension is designed around — not guarantees about what it will find.
Checking a breakpoint change
Step through the sizes around a breakpoint to confirm the transition happens where you intended and nothing overflows in between.
Reviewing a responsive component
Cycle through your saved presets to confirm a new component behaves at every size your team supports.
Privacy
How your data is handled
Viewport Resizer changes how a page is displayed in your own browser. It is designed to operate locally and to avoid collecting information about the pages you test.
- Viewport presets are stored locally for your own use.
- The extension does not require an account or a network connection to resize a page.
- No page content or browsing history is collected.
- Any future change to data handling will be documented on this page before release.
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Follow Viewport Resizer
This extension is still being built. Explore the rest of the catalog in the meantime, or get in touch with questions.