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Test CORS headers and preflight behaviour for any endpoint. Debug cross-origin request issues without writing code.
Use this security headers checker online guide to get faster results with practical steps and free browser tools from ToolToolLab.
Free online word counter. Count words, characters (with/without spaces), sentences, and paragraphs instantly. Perfect for essays, articles, and social media. No signup needed.
Count characters, words, and lines for Twitter, Instagram, Facebook, LinkedIn, and TikTok instantly. No signup.
CORS Policy Tester helps you simulate and validate Cross-Origin Resource Sharing (CORS) requests. Get instant feedback on header configurations and specific server setup guides for Nginx, Apache, and Node.js. It runs instantly in your browser with no installation, so you can get results fast. Helpful for security and network checks.
Why choose this tool on ToolToolLab
No signup, no upload wait, and no server-side storage. Everything runs safely in your browser. Free to use with no hidden limits.
Yes. Results are generated instantly from inputs.
Only checks possible in a browser environment.
No. Nothing is stored on a server.
It is designed for quick security/network workflows.
Yes. All features are available for free.
No. Processing is done locally in your browser.
Yes. The tool is fully responsive.
Simulate and validate Cross-Origin Resource Sharing (CORS) requests. Get instant feedback on header configurations and specific server setup guides for Nginx, Apache, and Node.js.
Copy a ready-to-share link for your team or community.
Embed this tool in your blog or docs so visitors can use it directly.
Generate Time-based One-Time Passwords (TOTP) for 2FA. Test your secret keys and generate QR codes compatible with Google Authenticator, Authy, and Microsoft Authenticator.
Deconstruct complex URLs into their fundamental components. Analyze protocol, hostname, port, path, and deeply nested query parameters with ease.
Deep-parse User-Agent strings to identify specific browser versions, operating systems, device types, and hardware architectures. Essential for web debugging and analytics.
Resize images by pixels, percentage, or target file size (KB). Use social presets and batch processing for fast web and social uploads.
Combine multiple PDF files into one document online. Ideal for reports, contracts, and submission packages.
Split a PDF by page ranges (e.g., 1-3,5) and download only what you need.
Advanced security tool to evaluate password complexity. Get real-time entropy calculation, crack-time estimations against supercomputers, and actionable tips to improve your digital security.
Decode and inspect PEM-encoded SSL/TLS certificates and CSRs. View validity periods, subject alternative names (SAN), issuer details, and public key information.
Verify file integrity by calculating MD5, SHA-1, SHA-256, and SHA-512 hashes. All processing happens locally in your browser—your files are never uploaded.
Comprehensive database of over 1000+ TCP and UDP ports. Quickly search for common services, official IANA assignments, and known Trojan/vulnerability associations.
Evaluate your website's HTTP security headers. Generate perfect configurations for CSP, HSTS, X-Content-Type-Options, and more to protect against XSS and clickjacking.
Professional networking tool to calculate IPv4 subnets. Find network addresses, broadcast addresses, usable host ranges, and CIDR notation details instantly.