SEO Bookmarklets

Remove URL Parameters
Clears any parameters of the current URL, allowing you to work on the real (canonical) version

Open Domain in Ahrefs
Does a Domain analysis on Ahrefs

Open URL in Ahrefs
Does a URL analysis on Ahrefs

Open Domain in SEMrush
Does a Domain analysis on SEMrush

Open URL in SEMrush
Does a URL analysis on SEMrush

Open Domain in Moz
Does a Domain analysis on Moz

Open URL in Majestic
Does a URL analysis on Majestic

Open Domain in SISTRIX
Does a Domain analysis on SISTRIX

Open URL in SimilarWeb
Displays the traffic analysis for the Domain

Domain Index Status on Google
Displays how many of the domain’s pages are indexed by Google

URL Index Status on Google
Checks if the page/URL has been indexed Google

Past Week Index Status
Displays the pages that were indexed in the past week for the domain

Past Month Index Status
Displays the pages that were indexed in the past month for the domain

HTTP Pages Index Status
Displays all the HTTP (insecure) pages that are still being indexed by Google

Check Page Performance
Show loading times, resources used and other performance variables for the URL (source)

Open URL in the PageSpeed Insights Tool
Runs the URL through the PageSpeed Insights tool

Open URL in the Mobile-Friendly Test Tool
Runs the URL through the Mobile-Friendly Test tool

Open URL in the Structured Data Testing Tool
Runs the URL through the Structured Data Testing tool

Open URL in the Rich Results Testing Tool
Runs the URL through the Rich Results tool

Open URL in the Wayback Machine
Shows the previous versions of URL on the Wayback Machine

Google Cache Page Viewer
Displays the cached version of the page on Google

Broken Link Checker
Runs the URL through the W3C Link Checker Tool

Highlight HTML Headers
Highlights the HTML header tags of the page (H1, H2, etc)

Highlight NOFOLLOW Links
Highlights the NOFOLLOW links in the page

Highlight DOFOLLOW Links
Highlights the DOFOLLOW links in the page

Identify Internal & External Links
Colors internal links in blue, external links in red and on-page/anchor links in orange

List All URLs
Open a window with all the links from the page

Change Anchors to Full URLs
Replace the link anchors with the actual URLs

Canonical URL Checker
Display the canonical URL of the page and whether it matches the current URL of the page

Show Robots.txt
Displays the robots.txt file for the website

Show Sitemap.xml
Displays the sitemap.xml file for the website

Keyword Stuffing Checker
Show the number of times a keyword appears on a page

Word & Character Count
Displays the word & character count for the selected text

Replace Images with Alt Text
Display the alternate text for all the images on the page

Extract Text
Extract the page’s text

Sources:

https://cognitiveseo.com/blog/5714/69-amazing-seo-bookmarklets-to-supercharge-your-internet-marketing/
https://w-shadow.com/bookmarklet-combiner/
https://mrcoles.com/bookmarklet/
https://github.com/micmro/performance-bookmarklet