Free private developer tools
JSON formatter, Base64 encode/decode, JWT decoder, and more utilities for developers.
Format JSON, encode or decode Base64, and inspect JWT claims — all without sending data anywhere. Every tool runs locally in your browser.
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JSON Formatter
Format, beautify, or minify JSON in your browser. Validate and pretty-print instantly — no upload, free online JSON formatter.
devBase64 Encode & Decode
Encode text or files to Base64 and decode Base64 back — privately in your browser. Free online Base64 converter, no upload.
devJWT Decoder
Decode JWT header and payload in your browser. Inspect claims instantly — decode only, no upload, free online JWT decoder.