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WordPress Child Theme Generator

Underlay Child Theme
— free, instant, no coding

Generate a fully-working Underlay child theme instantly — free, with no coding required. Customize the name, author, colors and CSS, then download a ready-to-install ZIP.

Generate Underlay Child Theme →

Free forever. No signup. ZIP downloads in 2 seconds.

Underlay WordPress theme preview
v1.1.0
Latest version
November 2, 2026
Last updated

About Underlay

Underlay is a plain, lightweight block theme built to work seamlessly with the Blocksify block plugin. It gives your site a clean, standards-following foundation: a header and a footer you edit in the Site Editor, posts and pages, comments, pagination and a "Blank page" template for pages designed with blocks. It has no colours and no fonts of its own, and then stays out of the way. Accessible, right-to-left ready, WooCommerce supported.

By PressMaximum. Theme homepage ↗

Why use a child theme for Underlay?

Every time Underlay ships an update, any direct edits you made to its files are overwritten. A child theme isolates your changes — custom CSS, template overrides, additional functions — so the parent can update freely while your customizations stay intact.

  • ✓Survive Underlay updates without losing your edits.
  • ✓Override any Underlay template file by copying it into the child.
  • ✓Add custom hooks, shortcodes, or enqueue your own scripts.
  • ✓Roll back to the parent at any time by deactivating the child.

How to install your Underlay child theme

  1. 1

    Configure and generate

    Open the generator (already pre-filled with Underlay as the parent), enter your child theme name and any custom CSS.

  2. 2

    Download the ZIP

    The generator builds a ready-to-install ZIP containing style.css, functions.php, screenshot.png and README.txt.

  3. 3

    Upload to WordPress

    In WordPress: Appearance → Themes → Add New → Upload Theme. Choose the ZIP, click Install Now, then Activate. Make sure Underlay itself is also installed (the parent must be present).

Ready for your Underlay child theme?

No signup. No paywall. Generated and downloaded in 2 seconds.

Generate Underlay Child Theme

Frequently asked questions

What is a Underlay child theme? +

A child theme is a separate WordPress theme that inherits all functionality, design, and templates from Underlay (its parent). You make your customizations in the child so they survive updates to the parent theme.

Do I need to know code to use this generator? +

No. The generator creates a complete, valid Underlay child theme with style.css, functions.php, screenshot.png, and README.txt. You can customize via the form fields, and if you want to add custom CSS or PHP later you can edit the files directly.

Will the child theme break when Underlay updates? +

That's exactly what a child theme is designed to prevent. Underlay can be updated freely without losing your customizations, because they live in the child theme files.

Is this generator really free? +

Yes. There is no signup, no payment, and no limit on how many Underlay child themes you can generate. The zip is built on demand and downloaded directly to you.