Base64 Encode/Decode

Convert text to and from Base64. Supports URL-safe alphabet.

GuideHow to Read Base64 Data and JWT Tokens

Distinguish encoding from encryption and inspect JWT header and payload data without assuming signature validity.

Read guide →
JWT Decoder Text Encrypt/Decrypt MD5/SHA Hash Password Generator Password Strength Checker

Frequently asked questions

What is Base64?
An encoding that represents binary data using ASCII. Useful for embedding data in JSON or URLs.
When should I use URL-safe Base64?
When sending data in URLs or JWTs. It uses - and _ instead of + and /.
What does the Base64 Encoder and Decoder do?
Encode plain text as Base64 or decode valid Base64 data back into readable text.
How should I interpret a Base64 Encoder and Decoder result?
Read the displayed labels and validation messages together, then verify important findings against the original source. The result is a practical aid, not proof beyond the data it can inspect.
What can affect the Base64 Encoder and Decoder result?
Invalid characters, missing padding, a different text encoding, or binary input can prevent readable decoding.
Where can I learn more about using the Base64 Encoder and Decoder?
Read “How to Read Base64 Data and JWT Tokens” for a practical workflow, limitations, and checks to make after using the tool.