Base64 Encoder Online
Encode any text to Base64 format instantly. Supports full UTF-8 and Unicode characters. All encoding happens in your browser — nothing is sent to a server.
What is Base64 encoding?
Base64 encoding converts binary data into a text format using 64 ASCII characters (A-Z, a-z, 0-9, +, /). It is used to safely transmit binary data through text-based protocols like email (MIME), JSON, XML, and URL query parameters. The encoded output is approximately 33% larger than the original.
When to use Base64 encoding
Base64 is commonly used for: embedding images in HTML/CSS (data URIs), sending binary data in JSON APIs, email attachments (MIME encoding), storing binary data in text-based databases, and passing data through URL parameters. It is not encryption — Base64 is fully reversible and provides no security.
Frequently Asked Questions
Is Base64 encoding the same as encryption?
No. Base64 is an encoding scheme, not encryption. Anyone can decode Base64 without a key. It is designed for data transport, not security.
Why does Base64 increase file size?
Base64 represents 3 bytes of data using 4 ASCII characters, resulting in ~33% size increase. This is the trade-off for text-safe transport.