Unwrap Nested Base64
Sometimes data is Base64-encoded more than once (API gateways, copy-paste through another encoder, or an LLM “helpfully” re-encoding). This tool peels layers until the payload is plain text or binary—and shows each step.
When nested Base64 shows up
- An API already returned Base64 and a client encoded it again
- An LLM “encoded for safety” on top of existing Base64
- Config pipelines that Base64-wrap secrets multiple times
Stop when the next layer is no longer valid Base64 text, or when decoded bytes look binary (images, ZIP, PDF).
Vanliga frågor
Why would Base64 be encoded twice?
Common causes: encoding a value that was already Base64, wrapping binary in JSON as a string then encoding again, or an LLM applying Base64 on top of existing Base64.
How many layers do you peel?
Up to a safe limit (about 8). If every layer is still valid Base64 of printable text, we stop when the next decode would not look like Base64 text.
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