Validate link integrity instantly with this free browser-based bulk URL status checker. Identify 404 errors, redirects, and valid connections in real-time.
AI Generation Prompt
Technical Specification: Browser-Based Bulk URL Status Checker
Overview
A high-performance, single-file browser utility designed to perform bulk HTTP status checks on a list of user-provided URLs. The tool focuses on rapid validation of link integrity using non-blocking asynchronous requests.
Core Features
- Bulk Input: A clean, large-scale textarea for pasting lists of URLs (one per line).
- Asynchronous Processing: Multi-threaded-like execution using
async/awaitandPromise.allSettledto check multiple URLs simultaneously without freezing the UI. - Real-Time Dashboard: A responsive table showing the status icon, full URL, and HTTP status code.
- Filtering System: Tabbed navigation to quickly filter results by 'All', 'Successful (200)', 'Redirects (3xx)', 'Client Errors (4xx)', and 'Server Errors (5xx)'.
- Export Capability: A one-click CSV export button to download the validation results for offline reporting.
UI/UX Layout
- Header: A professional, centered title with a brief tool summary.
- Input Area: A prominent, rounded-corner textarea with a soft border, featuring a 'Check Links' primary button with a subtle loading spinner animation.
- Statistics Cards: A row of summary cards displaying total links, active links, and broken links, styled with distinct light-mode colors (e.g., success green, alert red, info blue).
- Results Table: A clean, striped, whitespace-rich table. Status codes are color-coded: 200 (Emerald), 3xx (Amber), 4xx (Rose), 5xx (Purple).
Color Palette (Light Mode)
- Primary Background:
#FFFFFF - Surface/Card Background:
#F9FAFB - Border Color:
#E5E7EB - Text Primary:
#111827 - Text Secondary:
#6B7280 - Accent (Primary Button):
#2563EB - Success:
#059669 - Warning:
#D97706 - Error:
#DC2626
Technical Constraints & Requirements
- Single File: Everything in one HTML file (Embedded CSS
<style>and JavaScript<script>). - Vanilla Architecture: Pure JavaScript/HTML5/CSS3. No external dependencies required (unless via lightweight CDN for iconography or Tailwind CSS for rapid styling).
- No Storage: Stateless design. No
localStorage,cookies, orIndexedDB. All state is volatile memory. - CORS Handling: Implement
mode: 'no-cors'for initial checking where standard requests are blocked, but provide clear UI messaging for failed requests so users understand browser limitations. - Responsiveness: Use CSS Flexbox/Grid for fluid layout adjustments. Mobile users should see a stacked results view.
- Animations: Use CSS transitions (
transition: all 0.2s ease-in-out) for hover states on buttons and for the entry of new result rows in the table.
Spread the word
Files being used
Frequently Asked Questions
Everything you need to know about using this application.
How does this free bulk link checker work?
This application uses the browser's native Fetch API to perform asynchronous HTTP requests to the list of URLs you provide. When you click the 'Check Links' button, the application initiates non-blocking HEAD requests to each URL to retrieve their server response status without downloading the entire page content, ensuring efficiency and speed. Once the requests are completed, the tool parses the HTTP status code (e.g., 200 for OK, 301 for Redirect, 404 for Not Found) and updates the dashboard in real-time. Because the tool runs entirely within your browser, no data is sent to external servers, providing a private and secure environment for checking your link integrity.
Why do some links report as 'Blocked' or 'Failed'?
Most browsers enforce Cross-Origin Resource Sharing (CORS) security policies, which prevent client-side web applications from accessing responses from certain external domains. If a website does not explicitly allow cross-origin requests, your browser may block the fetch attempt to protect your privacy and security. Additionally, some servers may reject HEAD requests entirely or block requests coming from browser-based tools. When a link reports as 'Blocked' or 'Failed,' it does not necessarily mean the link is broken, but rather that the browser cannot establish a connection under current security constraints. You may need to verify these specific URLs manually in a new tab.
Is this link validator compatible with mobile devices?
Yes, this tool is designed with a mobile-first, responsive interface that adapts seamlessly to any screen size. Whether you are using a desktop computer, tablet, or smartphone, the layout remains optimized for readability and interaction, allowing you to manage large lists of URLs efficiently on the go. All buttons, input fields, and result tables are sized for touch-friendly interaction and smooth scrolling. The responsive CSS ensures that columns in your results table collapse or stack intelligently on smaller devices, providing a premium experience regardless of your chosen hardware.
Does this tool store my link history or data?
This application is built with a 'privacy-first' architecture that uses zero persistent storage. We do not utilize cookies, localStorage, sessionStorage, or IndexedDB, meaning no data is saved between sessions or stored on your device. Once you close the browser tab or refresh the page, all your input data and the resulting link status report are permanently cleared from the application's memory. This design choice ensures that you can handle sensitive link lists without worrying about data remnants or privacy leaks.
