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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.