jsonpost
Converters

JSON to Base64 Encoder

Encode JSON into a Base64 string for safe transmission in URLs, headers, and data URIs.

Runs entirely in your browser — your data never leaves your device.

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How to use this tool

  1. 1Paste your JSON into the editor.
  2. 2Choose standard or URL-safe Base64.
  3. 3Copy the encoded string.

Frequently asked questions

Does it handle emoji and international text?
Yes. The JSON is UTF-8 encoded before Base64 conversion, so unicode survives the round trip.
What is URL-safe Base64?
A variant that replaces + and / with - and _ so the string is safe to place directly in URLs.
Is my data uploaded to a server?
No. Every tool on JSONPost runs entirely in your browser using JavaScript. Your JSON never leaves your device, so it is safe to use with private or sensitive data.

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Decode Base64-encoded strings back into formatted, readable JSON in one step.

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JSON to Query String Converter

Convert a JSON object into a URL-encoded query string, and back again.