Encode and decode
text = Hello, world!mode = encode
Result: Enter text and select Encode to see the Base64URL output.
Base64URL Decoder
Decode Base64URL-encoded data back to its original text. Base64URL is URL-safe (uses - and _ instead of + and /) and omits padding. Commonly used in JWTs and URL parameters. Base64URL is an encoding, not encryption - it provides no confidentiality. Anyone can decode it trivially. Use it for data transport or format compatibility, never for secrets. Everything runs in your browser.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
Is Base64URL the same as encryption?
No. Base64URL is an encoding - a reversible transformation that anyone can undo. Encryption requires a key to reverse. Never use encoding to protect sensitive data.
Why does my decoded output look wrong?
Common causes: (1) the input was encoded with a different character set, (2) the input has extra whitespace or line breaks, (3) the input is corrupted. Try trimming whitespace and verifying the source.
Is my data sent to a server?
No. Encoding and decoding happen entirely in your browser. Nothing is transmitted anywhere.
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