Title: Interwebbi's Asset Inliner Author: Riku Turunen Published: February 25, 2026 Last modified: February 25, 2026 --- Search plugins ![](https://ps.w.org/interwebbis-asset-inliner/assets/banner-772x250.png?rev=3469428) ![](https://ps.w.org/interwebbis-asset-inliner/assets/icon-256x256.png?rev=3469428) # Interwebbi's Asset Inliner By [Riku Turunen](https://profiles.wordpress.org/rikuksf/) [Download](https://downloads.wordpress.org/plugin/interwebbis-asset-inliner.0.1.10.zip) * [Details](https://wordpress.org/plugins/interwebbis-asset-inliner/#description) * [Reviews](https://wordpress.org/plugins/interwebbis-asset-inliner/#reviews) * [Installation](https://wordpress.org/plugins/interwebbis-asset-inliner/#installation) * [Development](https://wordpress.org/plugins/interwebbis-asset-inliner/#developers) [Support](https://wordpress.org/support/plugin/interwebbis-asset-inliner/) ## Description Interwebbi’s Asset Inliner is a performance plugin that focuses on practical frontend asset optimization: * Inlines local frontend CSS from stylesheet links. * Rewrites relative CSS asset URLs so fonts/images still work after inlining. * Optional CSS minification. * Optional Google Fonts localization (detects Google Fonts stylesheets, downloads font files to local uploads, rewrites font URLs to local files, and inlines the rewritten font CSS). * Optional font-display policy override for localized Google Fonts (`keep`, `swap`,` optional`, `fallback`, `block`). * Optional preload tags for localized WOFF2 fonts. * Automatic cache busting on post/page saves, deletions, theme switches, updates, and plugin settings changes. Google Fonts localization is optional and disabled by default. ## Screenshots * [[ * Interwebbi’s Asset Inliner settings page. ## Installation 1. Upload the plugin folder to `/wp-content/plugins/` or install via the WordPress plugin uploader. 2. Activate the plugin through the “Plugins” screen in WordPress. 3. Go to `Settings -> Interwebbi's Asset Inliner`. 4. Enable only the options you want. ## FAQ ### Does this work with page caching plugins? Yes. The generated HTML (including inlined CSS) can be cached normally. Purge page cache after major style changes. ### Does this localize all Google Fonts automatically? When “Localize Google Fonts” is enabled, the plugin processes Google Fonts stylesheet URLs used on frontend pages and stores downloaded font files locally. ### Does this plugin send telemetry? No telemetry is included. Remote requests are only made when Google Fonts localization is enabled, and only to fetch Google Fonts CSS/font files required for rendering. ## Reviews There are no reviews for this plugin. ## Contributors & Developers “Interwebbi's Asset Inliner” is open source software. The following people have contributed to this plugin. Contributors * [ Riku Turunen ](https://profiles.wordpress.org/rikuksf/) [Translate “Interwebbi's Asset Inliner” into your language.](https://translate.wordpress.org/projects/wp-plugins/interwebbis-asset-inliner) ### Interested in development? [Browse the code](https://plugins.trac.wordpress.org/browser/interwebbis-asset-inliner/), check out the [SVN repository](https://plugins.svn.wordpress.org/interwebbis-asset-inliner/), or subscribe to the [development log](https://plugins.trac.wordpress.org/log/interwebbis-asset-inliner/) by [RSS](https://plugins.trac.wordpress.org/log/interwebbis-asset-inliner/?limit=100&mode=stop_on_copy&format=rss). ## Changelog #### 0.1.10 * Hardened local URL-to-file resolution with allowed-root containment checks. * Removed hardcoded include-directory assumptions from file path mapping. * Added Google Fonts remote host validation before downloading font files. #### 0.1.9 * Stored localized Google Fonts assets under `/uploads/interwebbis-asset-inliner/` for WordPress.org compliance. * Reworked local URL-to-file resolution to use WordPress directory/location functions instead of ABSPATH-based assumptions. * Sanitized `REQUEST_URI` handling for frontend request gating. #### 0.1.8 * Added Google Fonts filtering controls for localized downloads (allowed subsets, allowed weights, and optional italic variant toggle). #### 0.1.7 * Explicitly close plugin-owned output buffer on shutdown to avoid unclosed `ob_start()` flow in shared environments. #### 0.1.6 * Renamed plugin to “Interwebbi’s Asset Inliner” with slug `interwebbis-asset-inliner`. * Prefixed internal declarations and stored data keys with `interwebbiinlineassets_` for collision safety. #### 0.1.5 * Bypass all plugin optimizations on frontend requests for logged-in administrators. #### 0.1.4 * Added stricter frontend request gating so optimization logic runs only on true frontend page views. #### 0.1.3 * Renamed plugin branding/slug to remove restricted terms for WordPress.org compliance. * Removed discouraged translation loader call and aligned text domain usage. * Replaced direct database transient deletion with tracked transient key cleanup. * Replaced unlink() usage with wp_delete_file(). * Updated tested compatibility metadata and naming consistency. #### 0.1.2 * Added Google Fonts localization features (font-display policy and optional WOFF2 preload tags). * Added automatic cache busting on content/theme/update/settings events. * Added plugin settings link on Plugins page. * Improved compatibility for subdirectory WordPress installs. ## Meta * Version **0.1.10** * Last updated **2 months ago** * Active installations **Fewer than 10** * WordPress version ** 6.0 or higher ** * Tested up to **6.9.4** * PHP version ** 7.4 or higher ** * Tags * [css](https://wordpress.org/plugins/tags/css/)[fonts](https://wordpress.org/plugins/tags/fonts/) [google fonts](https://wordpress.org/plugins/tags/google-fonts/)[optimization](https://wordpress.org/plugins/tags/optimization/) [performance](https://wordpress.org/plugins/tags/performance/) * [Advanced View](https://wordpress.org/plugins/interwebbis-asset-inliner/advanced/) ## Ratings No reviews have been submitted yet. [Your review](https://wordpress.org/support/plugin/interwebbis-asset-inliner/reviews/#new-post) [See all reviews](https://wordpress.org/support/plugin/interwebbis-asset-inliner/reviews/) ## Contributors * [ Riku Turunen ](https://profiles.wordpress.org/rikuksf/) ## Support Got something to say? Need help? [View support forum](https://wordpress.org/support/plugin/interwebbis-asset-inliner/)