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Base64 to JSON

Free online Base64 to JSON decoder. Decode Base64 strings back to formatted JSON. Handles Unicode. Runs locally in your browser, no data uploaded to any server. 100% Local

How to Use the Base64 to JSON

Paste a Base64-encoded JSON string into the input box. Click Decode Base64 and the decoded JSON is pretty-printed and displayed. Use Clear to reset both panels.

How the decoding works

• Decodes the Base64 string back to UTF-8 bytes
• Converts UTF-8 bytes back to a JSON string
• Validates that the decoded output is valid JSON
• Formats the result with 2-space indentation

Features

• UTF-8 safe decoding — handles Unicode JSON correctly
• Reversible with the JSON to Base64 tool
• Reports errors if the input is not valid Base64 or JSON
• All processing runs locally in your browser. Your data is not uploaded to any server.

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