JSON → PNG → JSON (pure browser)

Randomly picks from the list in DEFAULT_BASE_IMAGES, or use an alternate base below.
Clicking the Encode button again selects a different base image (when using the built-in bases).

1. Encode JSON to PNG

Drop a .json file here, or paste below

Optional: drop an alternate base image (PNG)

No base image (data-only PNG) Validate JSON (reject invalid JSON instead of treating as text)

2. Decode PNG back to JSON

Drop a .png file here