You are responsible for key management and output validation.

Base64/URL/Hex Encoder Decoder

Base64/URL/Hex encoder and decoder. Zero-knowledge tool—runs locally in your browser.

Enter text to encode or Base64 to decode

Frequently Asked Questions

Which encoding formats are supported?

Base64, URL encoding, Hex, and HTML entities, including Unicode escapes.

Is encoding the same as encryption?

No. Encoding is reversible without a key and is not secure. Never use it to protect sensitive data — use the AES encryptor instead.

Does it work offline?

Yes. All conversions happen in your browser, so the tools keep working after the page has loaded.

How Base64 works, padding, size costs, and when to use it — and when not to.

Why + and / become - and _, and what that means for URLs and JWTs.

Inlining files as data URIs: request savings, size cost, and caching trade-offs.

Hash encoded text to verify integrity

Decode JWT payloads without sending tokens anywhere

Inspect Unicode characters hidden in encoded strings

Format decoded JSON payloads for readability

Your inputs remain on your device.