Convert text to Base64 and back. Fast, free, no signup.
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Base64 is a binary-to-text encoding scheme that converts binary data into an ASCII string format. It's commonly used to encode data that needs to be stored or transmitted over media designed to handle text.
Base64 encoding represents binary data in 64 printable ASCII characters: A-Z, a-z, 0-9, +, and /, with = used for padding.
Email attachments: SMTP was designed for text, so binary files are Base64 encoded.
Data URLs: Embed small images directly in HTML/CSS using data:image/png;base64,...
API keys: Basic Auth headers use Base64-encoded credentials.
JWT tokens: JSON Web Tokens use Base64URL encoding for their parts.