Base64 Encoder & Decoder

How Base64 Encoding Works

Base64 converts binary data into 64 printable ASCII characters:

• A-Z (26 characters)
• a-z (26 characters)
• 0-9 (10 characters)
• + and / (2 characters)
• = for padding

Every 3 bytes of input becomes 4 characters of output, making Base64 approximately 33% larger than the original data.

Common Use Cases

Data URLs

``html `

HTTP Basic Authentication

` Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ= `

JSON Data Storage

When you need to store binary data in JSON, Base64 encoding allows safe text representation.

URL-Safe Base64

Standard Base64 uses + and / which have special meaning in URLs. URL-safe Base64 replaces these with - and _`.