All your baseline are belong to us
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All your baseline are belong to us

Baseliner is a Chrome extension for perfectionist Front-End Developers and UX Designers.

This tool will add grid layer on top of any website to be used as a guidance when developing interfaces.


You can set the horizontal guides to match your specification as well as the starting point, in case you're only concerned about individual modules of your site.

For better experience, you can now change the colour of the lines as well as the opacity, making it easier to compare the grid with your website design.

Persistent Data

As of v5.3, Baseliner will save current configuration values into the Chorme Storage API. This enables the user to have a persistent experience when the extension is closed and opened later on.

Force height

Some websites set height: 100% to the body tag making its size to match the viewport. If you scroll down, Baseliner won't be repeated anymore due to being attached to the body tag.

By ticking the Force height checkbox, we overwrite that property: body {height: auto}, enabling Baseliner to repeat itself until the bottom of the page.


Baseliner is a Chrome extension and can be found at the Chrome Web Store -

Manual Installation

You can also install Baseliner without using the Chrome Store, this is helpful if you want to use a new feature that was no published yet.

  1. Download this repo as a Zip file and extract it into a folder
  2. Open Chrome Extensions page: chrome://extensions/
  3. Click Load unpacked extension
  4. Find the folder from #1 and select it