This is my list of the best SEO bookmarklets to use. My focus is on technical SEO, so this list will most likely contain many SEO bookmarklets which fall into the technical topic.
To use any of the bookmarklets, simply drag the title of the bookmarklet into your browser’s bookmarks.
My own bookmarklets
The following bookmarklets are my own creation. Use them if you like. They might not be super helpful for you, but they are helpful to me (at least).
Compare Google’s SERPs’ titles to pages’ actual title tags and h1 headings
This one is actually based on a bookmarklet by Federico Gomez. You can find all information on the dedicated page for this bookmarklet. Click the link to see it: Bookmarklet: Compare SERP titles to actual onpage titles and h1 heading
This bookmarklet highlights all headings <h1> to <h6> on the current page in different colors. Open the dev-tools / browser console to get an array of the headings, grouped ny heading type.
SEO Bookmarklets I have found useful
The following bookmarklets are the ones I have found to be useful in my daily work as an SEO. To use these, simply drag the title of the bookmarklet’s paragraph into your bookmark toolbar.
Here’s a list of cool SEO bookmarklets put togther by Alexander Außermayr.
This bookmarklet lets you scrape and export the entries of a Google SERP (Search Engine Results Page). It's been coded by cognitiveSEO.
The Schema Markup Validator bookmarklet will send the URL of the currently opened page to the Schema.org Markup Validator.
Use this bookmarklet to open the currently viewed page in your Google Search Console's "Performance Report". Of course, this only works for pages of websites that you have access to within GSC.
This bookmarklet wil open the currently viewed page in Google's Mobile Friendly Test Tool.
External: WOW! Awesome SEO Bookmarklet!
Check out this amazing bookmarklet... kind of like an All-In-One thing by twkm.ca.