# PX: Viewport Dimensions

> Displays the viewport dimensions when a browser window is resized.

Canonical page: [https://chrome-stats.com/d/px-viewport-dimensions](https://chrome-stats.com/d/px-viewport-dimensions)

## Overview

- **ID:** `px-viewport-dimensions`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Luke Peters
- **Category:** web-development,appearance
- **Daily users:** 874
- **Weekly downloads:** 9
- **Rating:** 4.59 / 5 (22 ratings)
- **Version:** 2.0
- **Last updated:** 2025-11-06
- **First published:** 2019-03-10
- **Size:** 21 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/px-viewport-dimensions/)
- **Website:** [https://github.com/LukePeters/px-viewport-dimensions](https://github.com/LukePeters/px-viewport-dimensions)

## Description

PX: Viewport Dimensions is a handy Chrome extension that shows your browser's viewport size in real-time as you resize the window. Unlike other tools, it doesn't require Developer Tools to be open, making it simple and accessible for both developers and designers. It includes an easy-to-use panel that lets you enable or disable the plugin anytime, providing flexibility based on your needs. This tool is perfect for web development, responsive design testing, and ensuring layouts look great at any screen size.

## Rankings

- #3,540 — Overall
- #49 — resize
- #72 — sport
- #150 — tons

## Permissions and access

### Permissions

- `storage`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

PX: Viewport Dimensions is praised by web developers for its simplicity and essential functionality in displaying viewport sizes for responsive design. Users appreciate its ease of use and customization options. However, recurring issues include the popup being obscured by high z-index elements, limited customization of popup size and location, occasional startup delays, and minor bugs like errors in the console or undesired popup appearances during fullscreen videos. Despite these, it remains a valuable and lightweight tool appreciated by its users.

### Pros

- Provides real-time display of viewport dimensions helpful for responsive web design.
- Simple, easy to use, and integrates well into web developer workflows.
- Small and lightweight, serving its purpose without unnecessary complexity.
- Allows customization such as changing the popup location and hide delay time.

### Cons

- Popup may be hidden behind elements with high z-index, causing visibility issues.
- Limited options for popup size and position; no pointer-event control to allow clicks through the overlay.
- Occasional initial delay before the addon activates or functions as expected.
- Can cause console errors or permission issues in some scenarios.
- Popup may appear in undesired contexts, like fullscreen videos, and lacks full control over persistence timing.

## Similar extensions and apps

- [Viewport](https://chrome-stats.com/d/viewport) — 194 users, 2.96 / 5
- [Dimension](https://chrome-stats.com/d/dimension-extension) — 4 users
- [Viewport Size Display](https://chrome-stats.com/d/viewport-size-display)
- [PX to VW](https://chrome-stats.com/d/px-to-vw) — 16 users, 5.00 / 5
- [Display Window Size](https://chrome-stats.com/d/display-window-size) — 32 users, 3.00 / 5
- [Display Div Dimensions](https://chrome-stats.com/d/display-div-dimensions) — 7 users
- [Dimensions](https://chrome-stats.com/d/dimensions_extension) — 1,091 users, 4.53 / 5
- [Window Size Helper](https://chrome-stats.com/d/window-size-helper) — 26 users
- [sbondPixels](https://chrome-stats.com/d/sbondpixels) — 1 users
- [Viewport Resizer Plus](https://chrome-stats.com/d/viewport-resizer-plus) — 33 users
- [showWindowSize](https://chrome-stats.com/d/showwindowsize) — 6 users
- [Image Size Display](https://chrome-stats.com/d/image-size-display) — 23 users

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Source: [Chrome-Stats](https://chrome-stats.com/d/px-viewport-dimensions)