Canonical Attachments — WordPress PDF Plugin
by hivedigital · WordPress.org page
Canonical Attachments has 300+ active installs on WordPress.org and 7,758 downloads all time. We have tracked it since September 4, 2026; download trends appear after 30 days of data. The last update was on August 25, 2025, tested up to WordPress 6.8.8.
Canonical Attachments at a glance
Is Canonical Attachments well maintained?
Features
The feature list from the plugin's own readme on WordPress.org, trimmed to the essentials.
- Generates an htaccess file to manage the wp-content/uploads directory where these files are being uploaded
- Updates the htaccess file with canonical tags which are delivered via a header when the attachment is called
- Creates a dashboard where you can easily filter and find attachments without canonicals or that are not attached to a post
- Creates a dashboard where you can easily attach a file to its parent post (one at a time or in bulk) or manually add/remove a canonical tag for a file
- Allows you to add a canonical url from the media file in the library or when you upload
- Creates a dashboard to edit the .htacess file directly for the uploads directory in case there are additional files in the directory that were uploaded outside…
Canonical Attachments reviews and ratings
3 reviews on WordPress.org, with the most recent ones as their authors posted them.
3 reviews
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Unsecured vulnerability since April 2025
The WordPress Canonical Attachments plugin up to version 1.8 has a known Cross-Site Scripting (XSS) vulnerability, tracked as CVE-2025-32543 and first published 2025-04-09. Because the plugin fails to sanitize user inputs, unauthenticated attackers could inject malicious scripts. As of mid-2026, no official patch is available.
Dan Knauss -
Does what it should do
Great and unique plugin for those who are into SEO. Special thanks for the support from the developer.
chidoti -
Works exactly as expected!
The plugin is easy to install and the admin interface makes it super simple to quickly add the canonical tag to pdf files. As one of the developers of the plugin, I am biased, but ... I can honestly say that it accomplishes everything that I need.
Jake Bohall
Details
Get more information from analytics and higher rankings by utilizing canonical http headers in htaccess for non image media attachments like pdfs.
The full description, screenshots and every review live on the WordPress.org page.
Rankings Canonical Attachments competes in
Tags
- attachments
- canonical
- canonical tags
- canonicalize
- Version
- 1.8
- Last updated
- Aug 25, 2025
- First published
- Jan 19, 2017
- Requires WordPress
- 4.5.1
- Tested up to
- 6.8.8
- Requires PHP
- –
- Pricing
- Free on WordPress.org
Canonical Attachments FAQ
What does Canonical Attachments do?
According to its WordPress.org readme, Canonical Attachments offers Generates an htaccess file to manage the wp-content/uploads directory where these files are being uploaded, Updates the htaccess file with canonical tags which are delivered via a header when the attachment is called, Creates a dashboard where you can easily filter and find attachments without canonicals or that are not attached to a post, Creates a dashboard where you can easily attach a file to its parent post (one at a time or in bulk) or manually add/remove a canonical tag for a file and Allows you to add a canonical url from the media file in the library or when you upload.
How many active installs does Canonical Attachments have?
WordPress.org reports 300+ active installs for Canonical Attachments as of September 7, 2026.
Is Canonical Attachments still maintained?
The last release was on August 25, 2025, more than a year ago. WordPress.org shows a warning on plugins that go this long without an update.
Is Canonical Attachments free?
Canonical Attachments is free to install from WordPress.org. Many plugins also sell a paid version or add-ons.