Description
Crumbler is a hosted cookie consent service. This free, open-source plugin is the WordPress connector for it: enter your Site Key, enable the widget, done. The plugin provides:
- Cookie consent banner with configurable design
- Automatic script blocking before consent
- Automatic iframe blocking (e.g. YouTube, Google Maps)
- Cookie cleanup for non-accepted categories
- Google Consent Mode v2 support
- Cookie declaration (Gutenberg block and shortcode) with all detected services and cookies
- Multi-language support (DE, FR, IT, EN)
Free plugin, paid service (no trialware)
The plugin itself is free and completely open source — none of its functionality is locked, time-limited or restricted to a paid tier. The cookie consent service behind it (operated by Compresso AG) requires a Crumbler account and subscription; a free trial is available. See External services below for exactly what data is exchanged.
How it works
- Create an account at crumbler.ch
- Add your domain and copy the Site Key
- Install and activate this plugin
- Enter the Site Key under Settings > Crumbler
- Enable the widget — done!
The settings screen shows a live connection status, so you can see right away whether your domain is set up and active in Crumbler.
External services
This plugin connects your website to Crumbler, a hosted cookie consent service operated by Compresso AG. The plugin is a free, open-source client; the service requires a Crumbler account and subscription (a free trial is available). The plugin contains no locked or paid functionality.
The plugin does not contact the service until you enter a Site Key and enable the widget. It communicates with the Crumbler service (cmp.compresso.ch) in three ways:
-
Consent widget script. On every front-end page (once enabled and a Site Key is set) the plugin loads the consent widget from
https://cmp.compresso.ch/widget/cmp.min.js. The widget renders the consent banner, blocks third-party scripts and iframes before consent, applies Google Consent Mode v2, and records the visitor’s anonymised consent decision with the service. Data sent: your Site Key and the visitor’s consent interaction. -
Cookie declaration data. When the cookie declaration block or shortcode is displayed, the visitor’s browser requests the list of detected services and cookies from
https://cmp.compresso.ch/api/public/cookies. Data sent: your Site Key and the requested language. -
Connection status check. On the plugin’s settings screen (administrators only), the plugin requests
https://cmp.compresso.ch/api/public/configto show whether your domain is set up and active. Data sent: your Site Key and your site’s domain. The result is cached temporarily.
No data is sent to any party other than the Crumbler service.
- Service provider: Compresso AG
- Terms of Service: https://crumbler.ch/agb.php
- Privacy Policy: https://crumbler.ch/datenschutz.php
Credits
This plugin bundles the Press Start 2P font by Cody Boisclair, licensed under the SIL Open Font License 1.1. The full license is included at assets/fonts/Press-Start-2P-OFL.txt.
Screenshots
Blocks
This plugin provides 1 block.
- Cookie Declaration Displays the Crumbler cookie declaration with all detected services and cookies.
Installation
- Upload the
crumbler-cookie-consentfolder to/wp-content/plugins/, or install the plugin through the WordPress Plugins screen. - Activate the plugin through the “Plugins” menu in WordPress.
- Go to Settings > Crumbler.
- Enter your Site Key and enable the widget.
FAQ
-
Do I need a Crumbler account?
-
Yes. The plugin is the connector to the Crumbler service; the consent banner, blocking and cookie declaration are provided by that service. You can start with a free trial at crumbler.ch.
-
Where do I find the Site Key?
-
In your Crumbler dashboard, under the respective site. It is a UUID in the format
af232e06-59c2-4810-b09d-7a2b25632d1b. -
Do I need to manually tag scripts?
-
No. The widget automatically detects third-party scripts based on provider patterns from the Crumbler database. You can also tag scripts manually:
<script type="text/plain" data-cmp-category="analytics" data-cmp-src="https://example.com/script.js"></script> -
Does the plugin support Google Consent Mode v2?
-
Yes. The widget sets
gtag('consent', 'default', {...})and updates the consent status after the user’s decision. -
Two options:
- Gutenberg block: add the “Cookie Declaration” block. The language can optionally be overridden in the block settings.
- Shortcode: use
[crumbler_cookies]on any page or post, optionally with a language parameter:[crumbler_cookies lang="fr"].
-
Can I hide the widget for administrators?
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Yes. Under Settings > Crumbler there is an option to hide the widget for logged-in administrators.
Reviews
There are no reviews for this plugin.
Contributors & Developers
“Crumbler – Cookie Consent” is open source software. The following people have contributed to this plugin.
Contributors
Translate “Crumbler – Cookie Consent” into your language.
Interested in development?
Browse the code, check out the SVN repository, or subscribe to the development log by RSS.
Changelog
1.0.0
- Initial public release.
- Settings page with Site Key, language and advanced options.
- Live connection status check against the Crumbler service.
- Automatic widget integration on the front end.
- Cookie declaration as Gutenberg block (block.json) and shortcode.
- Multi-language support (DE, FR, IT, EN).