Layout Pest icon

Layout Pest

by Martin Sherwood · Developer Tools
Manifest V3 Free
View in Chrome Web Store Data as of 16 Oct 2026

A Chrome extension that helps you visualize and debug layouts by adding outlines to elements.

Users
67
+11 in 30 days
Rating
5.0 / 5
unchanged in 30 days
Ratings
1
0 in 30 days
Store rank
#97K
#81K among extensions
Version
1.1
updated 8 Apr 2025

Users

monthly, 2 years
03774Mar 2025Jan 2026Oct 2026
Latest, 16 Oct 2026: 67 usersMove the mouse over the chart for any month

Ratings count

monthly, 2 years
001Mar 2025Jan 2026Oct 2026
Latest, 16 Oct 2026: 1 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Layout Pest

Layout Pest is a useful tool for web developers and designers that helps visualize and debug page layouts by adding colorful outlines to all HTML elements. This extension is inspired by the popular Pesticide extension. Key Features: • Instantly toggle colored outlines around all HTML elements on any webpage • Interactive hover effects that highlight specific elements you're examining • Detailed tooltip showing element information including: - Element tag, ID, and classes - Exact dimensions and position - Margin, padding, and border values - Z-index and display properties - Complete CSS selector path • Customizable outline thickness (1-5px) • Badge indicator shows when the extension is active • Zero impact on page performance when disabled Perfect for: • Frontend developers debugging layout issues • Web designers checking element spacing and alignment • CSS troubleshooting and development • Teaching and learning about HTML structure • Responsive design testing Layout Pest is lightweight and easy to use. Simply click the extension icon to toggle outlines on any webpage, or use the context menu for additional options. Privacy Note: Layout Pest operates entirely within your browser and doesn't collect any data or require any special permissions beyond what's needed to function.

Growth

WindowUsersChangeRatingsRating
7 days−13−16.2%00.00
30 days+11+19.6%00.00
6 months+21+45.7%00.00
1 year+43+179.2%00.00

Chrome Web Store search rankings

Where Layout Pest appears when people search the store, with the 30 day change
Search phrasePosition30 days
layout#23+7

Version history

2 versions recorded
1.18 Apr 2025
1.019 Mar 2025

Details

Category
Developer Tools
First seen
19 Mar 2025
Size
37 KB
Languages
en-GB
Pricing
Free
Extension ID
jlomgoeojfnbjbgfmileolmhljmcnfpl

Permissions and risk

Minimal riskimpact 0, likelihood 1
Permissions
activeTabscriptingcontextMenusstorage

Alternatives to Layout Pest

Extensions that rank for the same store searches or share the Developer Tools category, ordered by users