jsonpost
Converters

Base64 to JSON Decoder

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

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

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How to use this tool

  1. 1Paste your Base64 string into the editor.
  2. 2The decoded JSON is parsed and pretty-printed.
  3. 3Copy the readable JSON output.

Frequently asked questions

Does it handle URL-safe Base64?
Yes. Both standard and URL-safe Base64 alphabets are supported, including unicode content.
Can I decode a JWT payload with this?
You can decode an individual Base64 segment, but for full token inspection use the dedicated JWT Decoder.
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.

Related tools

JSON to Base64 Encoder

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

JWT Decoder

Decode JSON Web Tokens to inspect the header and payload as formatted JSON, entirely in your browser.

JSON URL Encoder / Decoder

Encode JSON for safe use in URLs or decode URL-encoded JSON back into readable form.