What is Base64?
Base64 is an encoding scheme that converts binary data into a text string. Learn what Base64 is, how it works, and when to use Base64 encoding.
Base64 is an encoding scheme that converts binary data (like images or files) into a plain text string using 64 safe ASCII characters. It allows binary content to be safely transmitted over systems that only handle text.
How Base64 Works
Base64 takes every 3 bytes (24 bits) of binary data and encodes them as 4 ASCII characters chosen from a 64-character alphabet (A–Z, a–z, 0–9, +, /). Example: • Input text: "Hello" • Base64 output: "SGVsbG8=" The = padding at the end means the original data length wasn't a multiple of 3 bytes.
Why Use Base64?
Some systems (like email protocols or URLs) can only handle plain text and may corrupt binary data. Base64 solves this by representing any binary data as a safe text string. Common uses: • Embedding images in HTML/CSS (data URIs) • Sending binary files via email (MIME) • Storing binary data in JSON or XML • Basic HTTP authentication headers
Base64 vs Encryption
Base64 is NOT encryption — it provides no security. Anyone can instantly decode a Base64 string. It is purely an encoding scheme for compatibility, not for secrecy.
Try it yourself
Encode / Decode Base64About Base64
Base64 was originally designed for encoding binary attachments in MIME email. Today it is widely used in web development, especially for data URIs that embed images directly in HTML or CSS.
FAQ
- What is Base64 used for?
- Base64 is used to encode binary data (images, files, certificates) into text so it can be safely transmitted over text-only channels like email or JSON APIs.
- Is Base64 the same as encryption?
- No. Base64 is an encoding scheme, not encryption. It can be decoded by anyone instantly. Do not use Base64 for security purposes.
- Why does Base64 end with == ?
- The = or == padding ensures the encoded string length is a multiple of 4 characters. It appears when the original data length is not a multiple of 3 bytes.