JSON Base64 Encoder & Decoder Online
Encode JSON to Base64 or decode Base64 strings back to JSON instantly. Our free tool is essential for handling JWT tokens, API payloads, and data transport encoding.
Why Encode JSON to Base64?
You need to send JSON in a URL parameter or store it in a place that doesn't handle special characters well. Base64 encoding converts your JSON to a safe ASCII string. Decoding it back should give you the original JSON.
EEncoding
- 1. Paste your JSON to encode
- 2. Select encode operation
- 3. Get Base64 string output
DDecoding
- 1. Paste Base64 string
- 2. Select decode operation
- 3. Get readable JSON output
About JSON Base64 Encoder/Decoder
Base64 encoding is commonly used to embed binary data in JSON or transmit JSON in URL-safe formats. This tool encodes JSON to Base64 strings and decodes Base64 back to readable JSON. It runs entirely in your browser for privacy.
How encoding and decoding works
For encoding, paste your JSON and click Encode. The tool converts your JSON string to Base64 format. For decoding, paste a Base64 string and click Decode. The tool converts it back and validates the result is valid JSON.
Base64 expands data size by about 33 percent. The encoded output uses standard Base64 characters. Use Copy to grab the result or swap between encode and decode modes with the Swap button.
When you'd use this
You need to embed JSON in a URL parameter or HTML attribute. Or your API requires Base64-encoded payloads. This tool also helps when debugging Base64-encoded tokens or config strings.
Base64 is encoding, not encryption. Anyone can decode the output. Don't use it for sensitive data. For secure transmission, use proper encryption instead.
Questions
What is Base64 encoding?
Base64 converts binary data to ASCII text using 64 characters. It's used to safely transmit data in text-only contexts like URLs or email.
Does Base64 make data smaller?
No, Base64 increases size by about 33 percent. It's for compatibility, not compression. Use gzip for size reduction.
Is Base64 secure?
No, Base64 is easily reversible. It's not encryption. Use HTTPS and proper encryption for sensitive data.
Can I decode invalid Base64?
Invalid Base64 will fail to decode. Make sure your input uses valid Base64 characters and proper padding.
What about URL-safe Base64?
This tool uses standard Base64. For URL-safe variants with different characters, you may need a specialized tool.