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Developer Tools
JSON, formatters, encoders, hashes, JWT, regex, diff, and more — everything runs locally, nothing you paste is ever sent anywhere.
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Frequently Asked Questions
Is anything I paste here sent to a server?
No — every tool on this page runs entirely in your browser using JavaScript. Your JSON, code, tokens, and text never leave your device.
Does the JWT Decoder verify the token's signature?
No — it decodes the header and payload so you can read the claims, but verifying a signature requires the secret or public key, which this tool never asks for. Don't treat a successfully-decoded token as proof it's valid or untampered.
Why is MD5 still here if it's insecure?
MD5 and SHA-1 are cryptographically broken and shouldn't be used to protect anything sensitive — but they're still widely used for non-security checksums (verifying a file downloaded correctly, matching legacy system hashes), which is what this tool is for. Use SHA-256 or SHA-512 for anything security-related.