Browser Tools & Bookmarklets Category

Browse 75 tools tagged with Browser Tools & Bookmarklets (category). Filter by pricing, platform, language and more. The list below shows every tool matching this category. Each entry links to a full page with pricing, platforms, integrations, and API availability.

All 75 tools

• ⚡ Core Web Vitals Overlay

  Visualizes LCP FID and CLS metrics directly on the page for real-time performance tuning

  free
• 🔍 Detailed SEO Extension

  Professional SEO extension providing instant insights into metadata schema markup and headers

  free
• 🤖 HARPA AI

  AI-powered automation for web monitoring data extraction and ChatGPT integration in browser

  freemiumAPI
• 🔑 KeySearch Starter

  A browser-based keyword tool for identifying low competition niches and related search terms

  paidAPI
• 🔍 Koala Inspector

  Spy on Shopify stores to see used themes apps and newest products for e-commerce SEO

  freemium
• 📱 Mobile Simulator

  Test your website responsive design across dozens of mobile devices and tablet screen sizes

  freemium
• 🏷️ Open Graph Preview

  Visualizes how your website will appear on social media platforms like Facebook and Twitter

  free
• 🔎 SEO Search Simulator

  Simulates Google searches from any location in the world to check local rank and results

  free
• 🏷️ Schema Builder

  Point-and-click tool to generate complex JSON-LD schema markup without writing code

  free
• ⚡ AMP Browser Extension

  Instantly validates Accelerated Mobile Pages and provides real-time debugging for web developers

  open-source
• 🌑 Dark Reader

  Enables dark mode for every website to reduce eye strain during long SEO audit sessions

  open-source
• 📶 Wappalyzer

  Identify web technologies on websites including CMS frameworks and payment processors

  open-sourceAPI
• 🕵️ Ghostery

  Privacy extension that shows trackers and allows you to block them to see page speed impact

  open-source
• 📏 Dimensions

  A tool for designers to measure screen dimensions in the browser for pixel perfect layouts

  open-source
• 📦 JSONView

  Formats and validates JSON responses in the browser for easier API and structured data debugging

  open-source
• 🍪 EditThisCookie

  Manage cookies for SEO testing including location spoofing and session management.

  open-source
• 🗂️ Tab Manager Plus

  Efficiently manage hundreds of tabs with search filter and deduplication features

  open-source
• 💡 LinkClump

  Allows you to open copy or bookmark multiple links at once by dragging a selection box

  open-source
• 🛡️ CSP Evaluator

  Evaluates Content Security Policies to detect bypasses and improve site security

  open-sourceAPI
• 🎨 WhatFont

  The easiest way to identify fonts on web pages by simply hovering over the text

  open-source
• 🔗 Linkclump

  Drag a box around links to open them all in new tabs or copy them to clipboard

  open-source
• 🧹 Clear Cache

  One-click cache and data clearing to test live SEO changes without browser lag.

  open-source
• 🏗️ Check My Links

  Link crawler that finds broken links on a webpage to assist in technical SEO cleanup

  open-source
• 🔲 Clear Cache Shortcut

  One-click button to clear browser cache and cookies for testing fresh site changes

  open-source
• 🎨 Eye Dropper

  Color picker that allows you to pick colors from any webpage or color picker interface

  open-source
• 🧪 A/B Trend Checker

  Calculates statistical significance for A/B testing directly within your browser session

  free
• 🔎 Ahrefs SEO Toolbar

  On-page SEO report broken link checker and link metrics for visited pages

  freemiumAPI
• 🔦 Ayima Page Insights

  Highlight on-page SEO issues directly on the page including hidden content and alt text.

  free
• 🕵️ BuiltWith Technology Profiler

  Displays all technologies used on a site including tracking pixels and hosting providers

  freemiumAPI
• 📡 BuzzSumo Extension

  Find the most shared content and top influencers for any website or keyword search

  paidAPI
• 🎨 ColorZilla

  Advanced eyedropper and color picker for analyzing website color schemes for design and SEO

  free
• 📈 Da Vinci Tools

  Enhances Google Analytics and GTM with high-level visualizations and usability features.

  free
• 🧪 Data Miner

  Scrape data from any website into Google Sheets or Excel with one click

  freemium
• 🔤 Fonts Ninja

  Identify fonts used on any website and inspect CSS properties like size and spacing

  freemium
• 📸 Full Page Screen Capture

  Capture high-resolution full-page screenshots of entire websites with one click

  freemium
• 🧪 Google Optimize (Legacy Check)

  Visual editor for A/B testing although sunsetted many bookmarklets still use its logic

  free
• 🔍 Hunter - Email Finder

  Find email addresses associated with the website you are visiting for outreach campaigns

  freemiumAPI
• 🔑 LastPass

  Secure password manager for managing multiple SEO tool accounts and client logins

  freemiumAPI
• 🔗 Link Miner

  Checks for broken links and pulls backlink metrics from Ahrefs or Moz for link building

  paid
• 🌐 Link Redirect Trace

  The "all-in-one" redirect path analyzer that covers headers rel-canonicals and more

  free
• 📡 LinkResearchTools Toolbar

  Evaluates link power and trust indicators directly in your browser while browsing

  freemiumAPI
• 🤖 Meta SEO Inspector

  Inspects metadata and microdata for errors and compliance with search engine guidelines

  free
• 🔗 MozBar

  SEO toolbar that provides instant metrics like Domain Authority and Page Authority

  freemium
• 🔑 OAuth 2.0 Playground

  Test and debug OAuth 2.0 APIs for Google Search Console and Analytics integrations.

  freeAPI
• 📜 Open SEO Stats

  Shows web rank and SEO stats for the current page including backlinks and indexed pages

  free
• 📡 Portent's SEO Page Review

  Review meta data and on-page content relevance with a focus on marketing intent

  free
• 🤖 Robots Exclusion Checker

  Visual indicator of robots.txt and meta-robots directives to prevent accidental deindexing.

  free
• 🗂️ Session Buddy

  Unified session and tab manager to save and export groups of SEO research tabs

  free
• 📊 SimilarWeb Extension

  Provides website traffic statistics and engagement metrics for competitive benchmarking

  freemiumAPI
• 🏗️ Structured Data Testing Tool

  Validator for Schema.org and JSON-LD markup that simulates Google's rich results

  freeAPI
• 📦 Tag Assistant Legacy

  Troubleshoot installation of various Google tags including Google Analytics and Ads

  free
• 🕵️ Ubersuggest Extension

  Keyword volume and backlink data directly on Google YouTube and Amazon results

  freemium
• 🌍 VPN Proxy Master

  Switch locations to see localized SERP results and test regional SEO performance

  freemium
• 📏 Web Developer Overlay

  Adds a toolbar to the browser with various web developer tools for accessibility and SEO testing

  free
• 🛡️ Check My Headers

  Detailed view of HTTP response headers to verify security policies and caching rules

  free
• ⚡ Fast SEO Link Checker

  Lightning fast checker for links and redirects specifically for affiliate marketers

  paid
• 🗺️ Sitemap Navigator

  Browser-based tool to quickly parse and navigate XML sitemaps for deep site analysis

  free
• 🕵️‍♂️ Whois Freak

  Check domain ownership and registration history directly from the browser bar.

  freemiumAPI
• 📄 Quick Source Viewer

  A refined view of the page source with syntax highlighting and resource grouping

  open-source
• 🧩 Extensions Manager

  Toggle browser extensions on and off quickly to avoid memory bloat and conflicts

  open-source
• 📋 Copy All URLs

  Quickly copy all open tab URLs to the clipboard in multiple formats for research sharing

  open-source
• ⏱️ Page Load Time

  Minimalist extension that displays the exact loading time of a webpage in the browser toolbar

  open-source
• 🏗️ Alt Text Tester

  Hover over images to see their alt text and identify missing attributes for accessibility

  open-source
• 🖼️ View Image Info

  Extracts image metadata including alt text, file size, and dimensions directly from the browser.

  open-source
• 💬 Word Counter Plus

  Simple tool to count words and characters in selected text on any web page

  open-source
• 🔗 NoFollow Simple

  Highlights all nofollow and sponsored links on a page to visualize internal link equity

  open-source
• 📋 Simple URL Copy

  One-click to copy current URL or all URLs from a window with clean formatting

  open-source
• 🎨 FontScanner

  Detects and lists all fonts used on a website along with their CSS properties and sizes

  free
• 🔍 Google Search Results Preview

  See how your page title and meta description will look in Google before you publish

  free
• 🏠 Home SEO Bookmarklet

  One-click bookmarklet to check on-page elements social tags and image assets

  free
• 📝 Note Anywhere

  Add virtual sticky notes to any web page that persist when you return to the URL

  free
• 📝 Note Board

  Sticky notes for websites that stay pinned to the URL for research and audit notes

  freemiumAPI
• 📱 Responsive Design Checker

  Test how your site responds to different screen resolutions and standard device sizes

  free
• 🤖 Robot.txt Viewer

  Quickly view and validate robots.txt files with syntax highlighting for better site crawling

  free
• 🛠️ Web Developer Checklist

  Interactive checklist of best practices for SEO mobile performance and security compliance

  free

Frequently asked questions