Device Info & System Tools
Sensor Tools
Screen & Display Tools
Network Tools
Developer Tools
Track all browser events — input, change, drag, drop, keypress, and more in real-time.
Interact here — Click, move, type, or drag something below.
Active Listeners: 0Drag & Drop Files Here
No events yet.
Get a complete online device scan instantly. Detect OS, exact model, CPU cores, GPU hints, RAM, screen size, and pixel ratio directly in your browser. Ideal for developers and testers needing a quick, client-side hardware overview. No software installation required. Perfect for system diagnostics, device profiling, and responsive design checks with fast, secure, and accurate results in real-time.
Instantly check screen resolution, viewport size, and orientation online. Perfect for responsive testing and layout optimization across devices. Detect physical and CSS viewport dimensions, analyze scaling behavior, and ensure accurate design rendering. A lightweight, browser-based tool for developers, designers, and QA teams seeking fast, real-time screen information without installing apps.
Instantly identify viewport width, height, and device pixel ratio for responsive design checks. Verify CSS breakpoints, test layout adjustments, and monitor real-time changes while resizing your browser. Ideal for frontend developers and designers aiming for precise cross-device compatibility. Lightweight, browser-based, and fast for testing breakpoints without installing software.
Audit your browser privacy with an instant fingerprint check. See canvas, timezone, language, and other fingerprintable components. Helps developers, testers, and privacy-conscious users understand data exposure. Fast, browser-based, and secure for evaluating online fingerprinting risks without installing apps.
Decode user agent strings online to reveal browser, engine, and OS information. Check device compatibility, identify rendering issues, and debug cross-browser problems quickly. A fast, browser-based solution for developers needing accurate, client-side metadata without extra installations.
Detect dark or light mode preferences in real-time. Preview CSS media query results for theme-aware web design. Perfect for responsive developers ensuring accurate theme rendering across devices. Lightweight, fast, and browser-based for immediate testing without any installation.
Calculate device pixel density (DPR) and PPI instantly for better image optimization and UI clarity. Helps designers, developers, and testers ensure precise visual rendering on all screens. Fast, online, and client-side, no software needed.
Quickly determine device timezone, local time, and UTC offset. Essential for developers handling time-based logic or global applications. Browser-based, fast, and accurate without installing extra software.
Reveal browser language and locale settings instantly for localization and internationalization testing. Perfect for developers ensuring content matches user preferences. Fast, browser-based, and no installation required.
Inspect browser storage limits, used quota, and available space for PWA development. Fast and accurate online tool to optimize storage-heavy web apps and debug capacity issues. Browser-based, no extra installation required.
Check battery level, charging state, and estimated time left online. Ideal for developers and testers monitoring battery performance and energy consumption. Fast, secure, and client-side, no software installation needed.
Track session duration and activity in real-time directly in your browser. Useful for developers testing session handling, analytics, or long-running web apps. Lightweight, fast, and secure without installation.
Monitor live memory usage and JavaScript heap size in your browser. Detect leaks, optimize performance, and debug bottlenecks efficiently. Fast, browser-based, and installation-free tool for developers and QA teams.
Run CPU performance tests and detect throttling behavior instantly. Ideal for developers and testers needing browser-side compute benchmarks. Fast, client-side, and installation-free for accurate performance analysis.
Visualize real-time gyroscope and accelerometer data directly in your browser. Ideal for developers and mobile enthusiasts testing device orientation, motion, and tilt detection for apps, games, or responsive layouts. No installation required, fully client-side and lightweight.
Access your device’s magnetometer to view compass headings and magnetic field data. Perfect for testing navigation apps, augmented reality, and location-based services, all in-browser with no extra software needed.
Monitor your microphone input visually with animated waveforms. Useful for audio engineers, podcasters, and developers checking mic sensitivity, background noise, or input quality. Fully browser-based and secure, requiring no installation.
Test custom vibration patterns on your device using the Vibration API. Ideal for mobile developers and UX designers ensuring haptic feedback works correctly for notifications, alerts, and interactive experiences.
Read real-time ambient light sensor data to test auto-brightness and theme triggers. Useful for app developers optimizing dark/light mode transitions and environmental responsiveness on modern devices.
Check your device’s proximity sensor for gesture detection or call-handling features. Perfect for developers and QA testers ensuring correct functionality without requiring additional apps or hardware.
Visualize audio frequencies in real-time for music, podcasts, or sound analysis. This browser-based tool helps audio engineers, musicians, and testers identify frequency ranges and troubleshoot sound issues easily.
Test webcam and camera functionality including FPS, autofocus, and device permissions securely in your browser. Perfect for video call setup, streaming, and webcam troubleshooting without installing software.
Check your display’s color bit depth and gamut range instantly. Perfect for designers, photographers, and digital artists who need precise color calibration. Browser-based, fast, and client-side, it ensures accurate representation of colors for digital content without requiring any software installation.
Visually test your screen’s brightness and contrast using guided patterns. Helps users, designers, and developers optimize display settings for clarity, readability, and accurate color reproduction. Fully browser-based and easy to use without additional apps or tools.
Compare different display resolutions like HD, FHD, and 4K to check aspect ratios and responsive layouts. Ideal for web designers, front-end developers, and UI testers ensuring content scales correctly across devices. Quick, client-side, and installation-free testing.
Detect your device’s current screen orientation and test rotation events in real-time. Useful for developers creating responsive designs or mobile apps, ensuring layouts adapt correctly when switching between portrait and landscape modes.
Verify fullscreen API support and detect multiple display setups directly in your browser. Essential for developers and QA teams testing immersive experiences, video apps, or multi-monitor configurations, all without installing extra software.
Calculate your screen’s DPI and pixel density for UI scaling and responsive design optimization. Helps designers and developers ensure content looks sharp and correctly sized across devices of different resolutions, all client-side in the browser.
Measure your screen’s actual refresh rate to ensure smooth visuals and accurate frame rendering. Useful for gamers, developers, and display testers to verify monitor performance, detect issues, and optimize rendering quality without installing software.
Identify dead or stuck pixels on your screen using cycling colors. Perfect for monitor, laptop, and phone testing to detect defective pixels. Quick, browser-based, and no installation required, ensuring your display meets quality standards.
Detect display flicker frequencies and PWM issues that may cause eye strain. Ideal for developers, designers, and health-conscious users to assess monitor comfort and visual performance. Browser-based, fast, and installation-free testing.
Simulate device notches, cutouts, and rounded corners to ensure UI elements remain visible. Essential for app and web designers optimizing layouts for modern devices with irregular screen shapes. Fast, client-side, and easy to use in your browser.
Measure your internet speed instantly in your browser. Get accurate download and upload rates, latency, and connection quality without installing software. Ideal for checking Wi-Fi, mobile data, or wired connections. Fast, reliable, and client-side, this tool helps you optimize your network performance and troubleshoot slow connections effortlessly.
Discover your local IP address, public IP, connection type, and geographical region instantly. Perfect for network diagnostics, security checks, and configuration purposes. Fast, browser-based, and installation-free, it provides all essential network details directly in your browser.
Check real-time network responsiveness with instant ping and latency tests. Monitor your connection speed to servers worldwide and detect network delays. A lightweight, browser-based tool for gamers, developers, and IT professionals aiming to troubleshoot latency issues quickly and efficiently.
Test and compare the response times of multiple websites or servers simultaneously. Identify slow hosts, monitor uptime, and detect network issues instantly. A fast, browser-based dashboard for IT professionals and developers needing real-time multi-host connectivity insights.
Verify WebSocket connections in real-time directly from your browser. Test message responses, connection stability, and communication performance for apps using WebSockets. Ideal for developers and QA teams ensuring real-time data delivery works perfectly without installing software.
Inspect website HTTP headers, response codes, and caching behavior instantly. Ideal for web developers, testers, and SEO specialists to debug requests and optimize web performance. Browser-based and fast, it provides complete response details without external software.
Test if websites use secure HTTPS connections and detect expired, invalid, or weak SSL certificates. Perfect for developers, IT professionals, and security-conscious users ensuring safe browsing. Fast, online, and installation-free for instant SSL verification.
Check device display cutouts, notches, and safe areas for modern screen designs. Helps developers ensure UI elements don’t overlap device-specific display features. Browser-based, fast, and client-side, ideal for responsive and adaptive web or app design testing.
Test clipboard access for text, HTML, and images safely in your browser. Ideal for developers debugging copy/paste functionality or testing permissions in modern web apps.
Test fullscreen toggling and screen wake lock support for immersive web apps. Useful for gaming, media players, and presentations to ensure uninterrupted display behavior.
List all supported browser APIs and current permission statuses to debug feature access. Perfect for web developers checking browser compatibility and user consent flows.
View and manage cookies, localStorage, and sessionStorage for privacy, session, and debugging purposes. Provides instant insights into data stored by web apps.
Interactive HTML5 drag and drop sandbox for learning and testing frontend functionality. Helps developers experiment with draggable elements, drop targets, and event handling.
Monitor DOM event firing and propagation in real-time. Useful for performance tuning, bug tracking, and ensuring proper interaction handling in web applications.
Check browser support for major APIs like WebRTC, Clipboard, Notifications, and more. Helps developers verify which features can be safely used across different environments.
Visualize CPU load, memory consumption, and frame performance in real-time using the Performance API. Ideal for debugging bottlenecks and optimizing web app performance.
Test push notification prompts and layouts for Progressive Web Apps. Ensures proper permission handling and user experience across browsers.
Capture webpage elements or entire pages as PNG images using browser rendering APIs. Useful for documentation, debugging, and visual testing without extra tools.
Pick colors from your screen and generate CSS-friendly palettes instantly. Perfect for designers and developers testing UI color schemes in real-time.
View, edit, and manage localStorage JSON objects directly in your browser. Ideal for debugging web applications and testing data persistence.
Simulate various screen sizes, resolutions, and orientations for responsive design testing. Essential for front-end developers and QA testers to preview layouts across devices.
Design, preview, and copy CSS gradients with live feedback in your browser. Makes styling web apps and experimenting with color transitions fast and easy.
Preview Google Fonts and custom fonts with live text editing. Helps designers and developers test typography for readability, style, and compatibility.
Check text and background color contrast for accessibility compliance. Quickly ensure readability and adherence to WCAG standards in web design.
Inspect, edit, and delete cookies for the current domain instantly. Useful for debugging sessions, authentication, and privacy-related testing.
Run custom JavaScript snippets safely in-browser to test logic, manipulate the DOM, or experiment with APIs without needing a full development environment.
Monitor all XHR and Fetch requests in real-time. Helps developers debug API calls, network issues, and page performance directly in the browser.
Upload local files to read content, validate JSON or CSV, and inspect structure directly in the browser. Useful for developers testing data formats and integrity.
Online Event Listener Debugger for Real-Time DOM Monitoring
The Online Event Listener Debugger is a powerful browser-based tool designed for web developers to monitor and debug DOM events in real-time. Understanding how events propagate, trigger, and interact is critical for building responsive, interactive, and high-performance web applications. Developers often face challenges when multiple event listeners conflict or when unintended behavior occurs due to event bubbling or capturing.
This debugger provides a live visualization of event listeners attached to elements on a web page. Users can inspect all registered events, including click, mouseover, drag, input, and custom events. It helps identify which elements respond to specific triggers and how events propagate through the DOM tree. By observing events in real-time, developers can detect duplicates, prevent default actions, and manage event delegation efficiently.
The tool also allows filtering and searching for specific event types or elements. For example, developers can focus only on click events or all listeners attached to a form. This feature is invaluable for debugging complex web applications, ensuring smoother user interactions and eliminating unexpected behavior. Beginners, students, and professional developers benefit from understanding event propagation and optimizing event handling strategies.
In addition to monitoring, the Event Listener Debugger provides interactive feedback, allowing developers to trigger events manually and observe their behavior. This includes testing stopPropagation, preventDefault, and delegation techniques without modifying source code. It supports major browsers like Chrome, Firefox, Edge, and Safari, working entirely in-browser with no installation required.
The debugger is ideal for front-end developers, QA engineers, and learners who want to optimize their web applications. It provides detailed insight into how DOM events operate, which elements respond, and how to structure code for optimal performance. By using this tool, developers can ensure robust, efficient, and predictable user interactions across all devices and browsers.
Overall, the Online Event Listener Debugger is an essential resource for mastering event handling in web development. It offers real-time visualization, interactive testing, event filtering, and compatibility with modern browsers. This tool makes learning, debugging, and implementing complex event-driven web applications faster, easier, and more reliable.
Real-Time DOM Event Debugger for Web Developers
The Real-Time DOM Event Debugger is an online tool designed for developers, students, and testers to monitor event listeners attached to web page elements. Modern web applications rely heavily on event-driven programming to create interactive user interfaces. Understanding event propagation, capturing, and delegation is critical to maintain responsive and bug-free applications.
This debugger visualizes all registered event listeners on elements, including clicks, hovers, input changes, and custom events. Users can track the origin, type, and order of events, helping to debug conflicts or unintended behavior. Developers can simulate events, inspect listener properties, and ensure that interactions behave as intended. This hands-on approach provides practical learning for both beginners and professional front-end developers.
Filtering capabilities allow users to focus on specific elements or event types, simplifying the debugging process for complex applications. Event firing sequences are clearly displayed, making it easier to identify issues caused by multiple listeners or incorrect propagation. This tool also highlights active and passive event listeners, helping developers optimize performance and avoid memory leaks.
The Real-Time DOM Event Debugger works entirely in-browser and supports major browsers like Chrome, Firefox, Edge, and Safari. No installation or server setup is required. It is ideal for QA engineers testing interactions, developers debugging complex front-end logic, or learners experimenting with event handling techniques.
By using this debugger, developers can gain insights into event propagation, improve code efficiency, and enhance application responsiveness. It ensures smooth user interactions, accurate event tracking, and better overall web performance.
In summary, the Real-Time DOM Event Debugger is a comprehensive, low-complexity tool for mastering DOM event monitoring. It provides real-time visualization, interactive testing, filtering, and browser compatibility, making it indispensable for front-end developers and learners seeking efficient debugging solutions.
Browser Event Listener Inspector for Interactive Web Pages
The Browser Event Listener Inspector is an essential online tool for developers looking to analyze and debug event listeners on interactive web pages. Web applications today heavily depend on event-driven programming, including click, drag, input, and custom events. Mismanaged events can lead to broken interactions, performance issues, and user frustration.
This tool provides a live view of all event listeners attached to DOM elements. Users can inspect listener types, the elements they are bound to, and their execution order. It allows developers to understand event propagation, capturing, and delegation while identifying duplicate or conflicting listeners. The interface also supports manual triggering of events to test behavior without changing the source code.
Filtering and search features enable developers to focus on specific events, element IDs, or classes. It shows both active and passive listeners, providing insights for optimizing performance and memory usage. This makes debugging complex web applications easier and faster.
The Browser Event Listener Inspector operates entirely in-browser and requires no installation. It supports all major browsers and ensures compatibility with modern front-end frameworks. This tool is perfect for students, QA engineers, and professional developers who want to gain a deeper understanding of event handling and optimize their code for real-time web applications.
In conclusion, the Browser Event Listener Inspector provides real-time monitoring, interactive testing, and detailed event insights. It simplifies debugging, enhances learning, and ensures smooth user experiences across all browsers and devices.
Interactive Event Listener Debugging Tool Online
The Interactive Event Listener Debugging Tool Online is a browser-based resource designed for front-end developers, students, and testers to observe and analyze event listeners on web pages. Events like clicks, hovers, input changes, and drag-and-drop are fundamental to interactive web applications. Proper management ensures responsive, bug-free experiences.
This tool allows real-time inspection of event listeners attached to DOM elements. Developers can see listener types, target elements, and the order of execution. They can simulate events, test stopPropagation, preventDefault, and delegation techniques without altering original code. This enhances learning and debugging efficiency.
The debugger includes filtering and search options to isolate specific events, elements, or listener types. Active and passive listener statuses are displayed, helping developers optimize performance and prevent memory leaks. It supports major browsers including Chrome, Firefox, Edge, and Safari, and works entirely in-browser with no downloads required.
Perfect for front-end learners, QA testers, and professionals, this tool helps understand event behavior, optimize interactions, and debug complex interfaces. It is an indispensable resource for mastering DOM event handling, ensuring smooth user interactions and improved web performance.
Overall, the Interactive Event Listener Debugging Tool Online provides real-time event monitoring, interactive simulation, filtering, and browser compatibility, making it ideal for learning and debugging web applications efficiently.
DOM Event Monitoring & Debugger Online
The DOM Event Monitoring & Debugger Online is an advanced browser-based tool for front-end developers and students to inspect, monitor, and debug event listeners on web pages. Event-driven programming is a core aspect of modern web development. Understanding how events propagate, fire, and interact is crucial for building responsive and interactive user interfaces.
This debugger displays all registered event listeners on DOM elements in real-time. Users can view the type, target element, and order of execution for events such as clicks, mouse movements, form submissions, and custom triggers. It allows developers to manually trigger events, observe propagation, and test stopPropagation and preventDefault methods for debugging purposes.
The tool provides search and filter options, letting users focus on specific events, element IDs, or classes. It also distinguishes between active and passive listeners, providing insights for performance optimization and memory management. By using this debugger, developers can identify duplicate listeners, prevent conflicts, and ensure predictable behavior across complex web applications.
This DOM Event Monitoring & Debugger works entirely in-browser and requires no installation. It supports all modern browsers, making it accessible to students, QA engineers, and professional developers. By providing real-time visualization, interactive simulation, and detailed insights, it simplifies the process of debugging event-driven web applications.
In summary, the DOM Event Monitoring & Debugger Online is an essential tool for mastering event handling in front-end development. It provides real-time monitoring, filtering, simulation, and browser compatibility to help developers build responsive, efficient, and bug-free web applications.
Toolpool
Online Device Info & System Scanner
Online Screen Resolution Analyzer
Viewport & Breakpoint Inspector
Browser Fingerprint & Privacy Viewer
User Agent Parser & Compatibility Checker
Dark Mode & Color-Scheme Detector
Device Pixel Density & PPI Calculator
System Timezone & UTC Offset Checker
Browser Language & Locale Detector
Storage Quota & PWA Capacity Viewer
Online Battery Health & Info Checker
Browser Session Uptime & Activity Tracker
Live Memory Usage & JS Heap Monitor
Browser CPU Benchmark & Throttle Simulator
Internet Speed & Bandwidth Test
IP Address & Network Info
Network Latency & Ping Monitor
Ping Multiple Hosts Dashboard
WebSocket Connectivity Tester
HTTP Header & Response Viewer
SSL & HTTPS Security Checker
Network Notch & Safe Area Detector
Display Color Depth & Gamut Tester
Screen Brightness & Contrast Evaluator
Aspect Ratio & Resolution Comparator
Online Screen Orientation Tester
Fullscreen Mode & Display Capability Checker
Online Screen DPI & Pixel Density Test
Frame Rate & Refresh Rate Detector
Online Dead Pixel & Stuck Pixel Tester
Screen Flicker & PWM Detection Tool
Display Safe Area & Notch Simulator
Online Gyroscope & Accelerometer Tester
Magnetometer & Compass Direction Finder
Microphone Input & Volume Level Visualizer
Vibration & Haptic Feedback Tester
Ambient Light & Lux Sensor Reader
Proximity Sensor Tester Online
Sound Frequency Spectrum Analyzer
Camera & Webcam Testing Tool
Clipboard API Tester & Copy Paste Inspector
Fullscreen & Screen Lock API Demo
Browser Permissions & API Support Checker
Cookie Storage & Session Inspector
Drag & Drop API Playground
Event Listener Debugger
Feature Detection & Compatibility Tester
Performance & Memory Usage Dashboard
Notification API Permission Tester
Web Screenshot Generator (HTML to PNG)
Color Picker & Palette Generator
Local Storage JSON Editor
Viewport & Device Simulator
CSS Gradient Generator & Preview
Font Preview & Typography Tester
Web Color Contrast Checker
Browser Cookie Inspector & Editor
JavaScript Code Snippet Runner
Network Request Logger (XHR/Fetch)
Local File Reader & JSON Validator