Base64 Converter - Free Online Encoder & Decoder Tool

How to Use the Base64 Converter

1. Choose your conversion mode: Encode (text to Base64) or Decode (Base64 to text)
2. Enter your text in the input field or upload a file
3. Click the "Encode" or "Decode" button to convert
4. Copy the result or download it as a file
5. Use the Reset button to clear all fields and start over

About Base64 Encoding

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It's designed to carry data stored in binary formats across channels that only reliably support text content.

Key Features:

• Converts binary data to ASCII text
• Uses 64 characters: A-Z, a-z, 0-9, +, /
• Padding character: = (equals sign)
• No data loss during conversion
• Widely supported across systems

Base64 Encoding Process

Base64 encoding follows a systematic process:

Encoding Steps:

1. Convert each character to its 8-bit binary representation
2. Concatenate all binary values into one continuous string
3. Split the binary string into 6-bit groups
4. Convert each 6-bit group to its decimal value (0-63)
5. Map each decimal value to the Base64 character set
6. Add padding (=) if needed to make the output length divisible by 4

Use Cases & Applications

Web Development:

• Embedding images in CSS or HTML
• Data URIs for small files
• API data transmission
• Storing binary data in JSON

Email Systems:

• Email attachment encoding
• MIME message formatting
• Binary data in email headers

Database Storage:

• Storing binary data in text fields
• Configuration data encoding
• Serialized object storage

Common Examples

Frequently Asked Questions