Base64 Decoder
Decode Base64 and Base64URL strings back to readable UTF-8 text in your browser. Useful for inspecting payload snippets, tokens, and config values.
Base64 Decoder
Decode Base64 and Base64URL strings back to readable UTF-8 text in your browser. Useful for inspecting payload snippets, tokens, and config values.
About Base64 decoding
Standard and URL-safe Base64 are accepted
The decoder normalizes URL-safe hyphen and underscore characters back to standard Base64, removes whitespace, and restores missing padding before decoding. That makes it practical for values copied from JSON, headers, logs, and token-like strings.
Output is intended for readable text
This page displays the decoded result as text. If the Base64 value represents an image, archive, or other binary file, extract the payload and decode it with a file-aware tool instead of expecting a download here.
FAQ
Common questions and answers about this topic.
What is Base64 decoding?
Converts a Base64-encoded string back to text when the original bytes represent UTF-8 text.
Can it decode data URLs?
If you paste a data URL like data:image/png;base64,..., extract just the Base64 portion after the comma for decoding.
Is my data sent to any server?
No, Base64 decoding is handled entirely in your browser. Your encoded string is decoded locally — nothing is uploaded to any server.