Base64 Encoder/Decoder
Encode and decode Base64
Methodology & standardsRuns on your device
Inputs
Results update liveInterpretation
How Base64 Encoding and Decoding works
The Base64 Encoder/Decoder converts data between its original form and Base64 representation. Base64 encoding transforms binary data into ASCII text using a 64-character alphabet, making it safe for transmission through text-based protocols like email, JSON, and HTML.
Example
Key features
A realistic scenario showing how the calculation guides a practical decision.
Formula
Encoded size = 4 * ceil(input bytes / 3) \u2014 approximately 133% of original size
- Encode text or files to Base64 format instantly
- Decode Base64 strings back to their original content
- Support for UTF-8 text and binary file encoding
- One-click copy for quick integration into code or APIs
Watch out
Common mistakes
- Base64 encoding increases data size by approximately 33%. Use it for embedding small images in CSS or HTML, but for larger files, consider direct file hosting instead.