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JSON Base64 Encode Decode Online

Encode JSON to Base64 and decode Base64 back to JSON.

Step 1: Choose direction

Click Encode to convert JSON to Base64.

+ Why Base64 encode JSON?

For embedding JSON in URLs, HTML attributes, or data URIs.

+ Is the encoding reversable?

Yes, Base64 is lossless and fully reversible. Decoding a Base64-encoded JSON string returns the exact original JSON data with all keys, values, and structure preserved.

+ What is the typical size increase?

Approximately 33% larger since 3 bytes become 4 characters.

+ Is Base64 the same as encryption?

No. Base64 is encoding, not encryption. Decode is freely available.