Full TLS audit: protocols, ciphers, vulnerabilities, grade.
Enter an HTTPS URL to check TLS version (1.2/1.3) and basic connectivity. The request is made from our server; full cipher audit may require additional tools.
Enter an HTTPS URL to check TLS version (1.2/1.3) and basic connectivity. The request is made from our server; full cipher audit may require additional tools. The tool runs entirely in your browser — your data stays on your device and is never transmitted to any server, making it safe for production data and sensitive credentials. Common search terms like TLS checker, SSL checker, certificate audit all lead to this tool because it addresses the specific need for browser-based validation in the Security ecosystem. Whether your input is a compact one-liner from an API response or a multi-line configuration file with hundreds of fields, TLS Configuration Checker processes it consistently and shows the result instantly. The tool preserves all data values during validation — only the presentation changes.
Using TLS Configuration Checker takes just a few seconds — there is no signup, no download, and no configuration required. 1. Paste your Security data into the input area. 2. The validator checks syntax, structure, and format-specific rules automatically. 3. Errors appear with line numbers and descriptions pointing to the exact problem. 4. A green indicator confirms the input is valid when no errors are found. 5. Fix reported errors and re-validate until the input passes all checks. All processing happens in your browser, so your data never leaves your device. The tool works on any modern browser (Chrome, Firefox, Safari, Edge) on desktop and mobile.
Developers across all experience levels use tls configuration checker for quick validation tasks that would otherwise require writing a one-off script or installing a cli tool. Technical writers and documentation authors use tls configuration checker to prepare accurate security examples for tutorials, api docs, and developer guides.
Reach for TLS Configuration Checker when you need to tls checker; when you need to ssl checker; when you need to certificate audit. It eliminates the overhead of writing throwaway scripts or installing CLI tools for quick validation tasks. Developers who work with Security data daily keep this tool bookmarked for instant access. The immediate feedback loop — paste data, see results, copy output — fits naturally into debugging sessions, code reviews, and rapid prototyping workflows where context-switching to a terminal or writing utility code would break your concentration.
To get the most out of TLS Configuration Checker, it helps to understand how validation works at a technical level. When working with TLS checker, keep these details in mind. HSTS validation checks max-age (should be at least 31536000 seconds / 1 year for HSTS preload eligibility), includeSubDomains (required for preload), and preload (opt-in to browser preload lists). CSP validation ensures directives are syntactically correct and don't contain unsafe values: 'unsafe-inline' in script-src allows XSS, 'unsafe-eval' allows eval() attacks, and wildcard (*) sources reduce protection. Security header validation checks that CSP, HSTS, X-Frame-Options, X-Content-Type-Options, and Referrer-Policy are present and correctly configured. Missing headers leave specific attack vectors open.
Avoid these common issues when using TLS Configuration Checker: Validation passing does not mean the data is correct — it means the syntax is valid. Semantic correctness (right values, right structure for your use case) requires additional review. Copy-pasting from word processors or rich text editors may introduce invisible characters (zero-width spaces, smart quotes, non-breaking spaces) that cause parsing failures. Use a plain text editor to prepare input. Character encoding matters: if your input contains non-ASCII characters (accented letters, emoji, CJK characters), make sure the encoding is consistent. UTF-8 is the standard for web content. Ensure your input is in the correct format before using TLS Configuration Checker. The tool expects valid Security input — submitting data in the wrong format produces confusing errors.
Using TLS Configuration Checker in your browser instead of a local CLI tool or library has distinct advantages for validation tasks. Convenience is the primary benefit: open a browser tab, paste your data, and get results in seconds. No installation, no dependency management, no version conflicts, and no PATH configuration. The tool works identically on macOS, Windows, Linux, and ChromeOS. For validation specifically, browser tools provide instant visual feedback that CLI tools cannot match. You see the validation result immediately, with syntax highlighting and error indicators, instead of reading plain text output in a terminal. Whether you found TLS Configuration Checker by searching for TLS checker or SSL checker, the browser-based approach means you can start using it immediately — no signup, no API key, no rate limits, and no usage tracking.
Access-Control-Allow-Origin: https://example.com
Access-Control-Allow-Methods: GET, POST, OPTIONS
Access-Control-Allow-Headers: Content-Type, AuthorizationPaste this into TLS Configuration Checker to see it processed instantly. This example represents a common validation scenario that you would encounter when working with Security data in real projects. Try modifying the input to explore how TLS Configuration Checker handles edge cases like empty values, special characters, and deeply nested structures.
Content-Security-Policy: default-src 'self'; script-src 'self' https://cdn.example.com; style-src 'self' 'unsafe-inline'This second example shows a different input pattern for TLS Configuration Checker. Real-world Security data comes in many shapes — API responses, configuration files, log entries, and integration payloads all have different structures. TLS Configuration Checker handles all of them consistently.
We verify protocol and connectivity server-side. For full SSL Labs-style audit, use a dedicated TLS scanner.