JSON to Base64 Converter
ConvertersEncode a JSON object as a Base64 string instantly in your browser. Swap to Base64→JSON in one click. URL-safe variant available. 100% client-side and free.
JSON → Base64
JSONjson
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Base64plaintext
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Input: 35 chars
About JSON to Base64 Converter
The JSON to Base64 converter JSON-stringifies the input and encodes it as a Base64 string using `btoa`. This is the same encoding used in JWT payloads, API tokens, and data URIs. Both editors are live — swap to Base64→JSON with one click. A URL-safe variant (replacing `+` with `-` and `/` with `_`) is also available for use in URLs and headers.
Features
- ✓Bidirectional — edit either panel and the other updates in real time
- ✓Encodes JSON to Base64 using btoa (standard Base64)
- ✓URL-safe Base64 mode available (replaces + with - and / with _)
- ✓Swap direction to Base64→JSON with a single click
- ✓Download encoded output as a .txt file
- ✓Copy output to clipboard in one click
- ✓100% client-side — data never leaves your browser
Common Use Cases
- Encoding a JSON payload for use in a JWT header or body
- Generating Base64-encoded JSON for use in HTTP Authorization headers
- Encoding JSON configuration as Base64 for environment variables
- Creating data URI JSON payloads for embedding in HTML or CSS
- Encoding JSON for URL-safe transmission in query parameters
Frequently Asked Questions
QIs the output standard Base64 or URL-safe Base64?
Standard Base64 by default. Toggle URL-safe mode to replace + with - and / with _ (removing padding) for use in URLs and JWT tokens.
QDoes it handle Unicode characters?
Yes — the converter UTF-8 encodes the JSON string before Base64 encoding to correctly handle non-ASCII characters.
QIs my data sent to a server?
No. All encoding runs in your browser.