File Optimizer

File Optimizer

by Speed Boostr

Minify CSS, JavaScript, and Liquid files.

3.6 of 5 stars(3 reviews)

Minify your files with ease

Reduce the size of your JavaScript, Liquid, and CSS asset files for improved site performance.

No dev experience required

Anybody can minify their files with the press of a button.

Revert your changes any time

You can revert your minified files to make edits or fixes before minifying them again.

About File Optimizer

About File Optimizer

File Optimizer gives you the opportunity to optimize the theme assets of your store without any developer experience or knowledge required.

Who is this app for?

  • If you want to minify CSS, JS, or Liquid files
  • If you're getting warnings in various analysis tools for unminified files
  • If you want a quick and easy way to minify theme assets

How it works

Visit the File Optimizer app, choose the theme that you'd like to minify files in, and click on the "Minify" button.

If you need to revert your changes cause you're making edits OR your site doesn't work due to the minifications, press "Revert".

Our app can only minify local files within your theme's assets. If you're looking for ways to minify 3rd party application files and scripts, you'll have to contact your app developers to help with that.

Free installation

The app has a free trial that allows you to minify one file for free.

If you need help installing the app or making it work, contact us! We've got you covered.

Liquid Minification

Liquid JavaScript files have long been an issue for minification. Our File Optimizer is able to minify your Liquid files without breaking their functionality.

Rockstar Support

We're a team of Shopify developers with experience building apps and customizing themes. If you ever need help, give us a shout!

Media gallery



Free to install

$24.99 one-time fee to upgrade to Unlimited access

3.6 of 5 stars

The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
  • 5 of 5 stars
    67% of ratings are 5 stars
  • 4 of 5 stars
    0% of ratings are 4 stars
  • 3 of 5 stars
    0% of ratings are 3 stars
  • 2 of 5 stars
    0% of ratings are 2 stars
  • 1 of 5 stars
    33% of ratings are 1 stars

Most recent reviews


super straightforward and easy to use. Helped reduce the size of my files + good customer support as well.


After buying full version, My store became more slower than before and got a Grade F
I contacted the developer and after checking, He told me "our app did its job" at least he didn't check the theme copy before installing that useless thing.
I Don't recommend absolutely.
Return my money back.

Developer reply

February 25, 2021

Thank you for your review. Our app's main focus is to minify .css, .js, and .js.liquid files for a site, which it was able to accomplish for your store (and removed the warnings that you saw on the web analyzer tools). Unfortunately, minification is only one metric that these analyzer tools measure, so often times it's not enough to change a grade from F to an A. Regardless, I hope that the analysis of your site that I provided during our communications was helpful in determining what you should look at on your site next and I'm sorry for any miscommunication that occurred!


I Installed the app and there was a problem making it work. The team answer fast and solved the problem. Now I have my assets minify! Thanks Chris for your help and all the team!