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KeptTools offers free browser-only developer tools that keep pasted data off servers

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A developer built KeptTools, a free set of utilities for formatting JSON and SQL, decoding JWTs, encoding Base64, generating hashes, and more. The creator was motivated by concerns that typical online tools upload pasted content such as staging tokens, database dumps, or secrets. According to the author, processing happens locally in the browser, and the more sensitive pages include no analytics, ads, or third-party scripts. Users can verify this by checking the browser's Network tab for outgoing requests. The creator is seeking feedback on how clear the privacy approach is and which features might be missing.

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