What is Base64 Encoding?

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It is commonly used when there is a need to encode binary data that needs to be stored and transferred over media that are designed to deal with textual data, like HTML, CSS, or JSON.

Common Use Cases

• Data URIs: Embedding small images or fonts directly into CSS or HTML files to reduce HTTP requests.
• API Authentication: Encoding Basic Auth credentials (username:password) to be sent in an HTTP Authorization header.
• Email Attachments: The MIME standard uses Base64 to attach binary files (like PDFs or images) to text-based emails.

Secure & Local Processing

When dealing with sensitive tokens or proprietary data, you shouldn't trust online tools that send your strings to a server. Our Base64 tool uses your browser's native btoa() and atob() functions (with full UTF-8 support). Your data never leaves your device.