Free online JSON to Base64 encoder. Encode JSON strings as Base64 for safe transport or storage. Supports Unicode. Runs locally in your browser, no data uploaded.
100% Local
How to Use the JSON to Base64
Paste JSON into the input box. Click Encode Base64 and the JSON string is encoded as a single-line Base64 string. Use Clear to reset both panels.
How the encoding works
Validates that the input is valid JSON before encoding
Converts the JSON string to UTF-8 bytes
Encodes the UTF-8 bytes to Base64 via btoa()
Output is a single compact line with no line breaks