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Crawl a site, read its headers, check its DNS. Tools that report what they measured — and say so when they cannot measure it.

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Analytics, only if you say so

We would like to use Google Analytics and Microsoft Clarity to see which tools get used and where pages go wrong. Clarity also records how a page is used — clicks, scrolling, mouse movement. Neither runs until you accept, and the tools all work either way. What we collect.

All tools/Converters & Utilities

JWT Decoder

Read the header and claims of a JSON Web Token. Decodes only — never verifies.

JWT *

Also in Converters & Utilities

Password GeneratorStrong random passwords, with the entropy behind them shown.Fill in a form UUID GeneratorRandom v4 or time-ordered v7 identifiers, generated locally.Fill in a form Lorem Ipsum GeneratorPlaceholder paragraphs, sentences or words for a layout.Fill in a form URL Slug GeneratorTurn a title into a clean, ASCII, search-friendly URL slug.Paste your own text Base64 Encoder / DecoderEncode or decode Base64, including the URL-safe variant.Paste your own text JSON Formatter & ValidatorValidate JSON, pretty-print or minify it, and measure its shape.Paste your own text

JWT Decoder — SEO Toolbox