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Home / Tech / Base64 Converter
Base64 is a group of binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation. It is commonly used to embed binary data (like images) directly into HTML or CSS files.
Use Base64 to embed small icons or logos directly into your
CSS or HTML using Data URIs (data:image/png;base64,...). This saves an HTTP request,
speeding up page load times. However, avoid this for large images as it increases file size by ~33%.
Base64 is encoding, not encryption. It provides zero security. Anyone can decode a Base64 string instantly. Never use it to hide passwords or sensitive data.
Reviewed by Alex Chen
Security Engineer
Alex ensures our technical tools follow security best practices.
Base64 is an encoding scheme that converts binary data into ASCII text using 64 printable characters. It's used when you need to transmit binary data over text-only channels (like email, JSON, XML, URLs).
No. Base64 is encoding, NOT encryption. Anyone can decode Base64 instantly—it's reversible with zero security. Never use Base64 for security.
Base64 uses 6 bits per character but stores it in 8-bit bytes. 3 bytes (24 bits) of binary data becomes 4 Base64 characters (32 bits), resulting in a ~33% size increase.
Don't use Base64 for large files (>1 MB) due to size bloat, or for storing passwords/sensitive data as it offers no security.