How it works
How to use the Base64 to JSON
Paste input
Paste the Base64 string.
Decode
The result is pretty-printed as JSON.
Copy the result
Use Swap to go the other way.
Why Base64?
Base64 represents any bytes using 64 safe ASCII characters, so JSON can travel through systems that only accept plain text — HTTP headers, environment variables, JSON strings or Kubernetes secrets. It makes data about 33% larger and is not encryption.
Built for developers
Why developers use it
Private by design
Runs 100% in your browser. Nothing you paste is uploaded, logged or stored on a server.
Instant results
Output updates as you type, with precise error locations when something is wrong.
Works offline
Once loaded, the tool keeps working without a connection. Install it as an app if you like.
Free, no sign-up
No accounts, no limits, no watermarks.
FAQ
Frequently asked questions
Is Base64 secure?
No. Base64 is an encoding that anyone can reverse. Never use it to hide secrets.
Is my data uploaded anywhere?
No. Everything runs locally in your browser — nothing you paste or open is sent to a server, logged or stored. The tool keeps working offline once the page has loaded.
Keep going
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