{} Utility / Tech

Free cybersecurity tools in this category. All browser-local where possible. No sign-up.

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MD5 Hash Checker

Generate or verify an MD5 hash in your browser. Legacy use only.

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HTTP Header Viewer

Request + response headers for any URL. Useful for debugging caching, redirects, and security headers.

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Robots.txt Checker

Fetch + parse a site's robots.txt and inspect crawl rules.

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MX Record Checker

Mail server records + priority for any domain. Useful for diagnosing mail delivery and spoofing.

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DNS Lookup

A / AAAA / CNAME / MX / TXT / NS / CAA records for any domain. Uses Google Public DNS.

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WHOIS Lookup

Registrar, registration date, and contact privacy status for any domain. Uses free RDAP.

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JSON Validator

Validate, format, and inspect any JSON payload. Runs in your browser.

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JWT Decoder

Decode a JSON Web Token to inspect header, payload, and claims.

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Base64 Encoder / Decoder

Two-way base64 with UTF-8 safety. Runs in your browser.

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SHA-256 Hash Generator

Hash any text or file in your browser using the native Web Crypto API. Nothing is uploaded.

About the Utility / Tech category

Free cybersecurity tools in this category. All browser-local where possible. No sign-up. Each tool in this category is free to use, works in your browser whenever possible, and explains what it found in plain English.