Free Online Base64 Encoder & Decoder
Encode and decode text to Base64 instantly with real-time processing. Free online tool with URL Safe support, no padding and detailed analysis for web development and APIs.
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What is Base64?
Base64 is an encoding system that converts binary data into ASCII text using only 64 safe characters. It's widely used in web development, APIs, emails and data transmission.
Base64 Advantages
- • Compatible with text-only systems
- • Preserves binary data integrity
- • Universal standard widely supported
- • Safe for HTTP/email transmission
Common Use Cases
- • Image encoding in CSS/HTML
- • HTTP Basic authentication
- • File transmission in APIs
- • Email attachments (MIME)
How Base64 Works
1. Input
Binary data or text is converted into groups of 3 bytes (24 bits)
2. Conversion
The 24 bits are divided into 4 groups of 6 bits, mapped to 64 characters
3. Output
Result in safe ASCII text, with '=' padding if necessary
Frequently Asked Questions
Is Base64 encryption?
No, Base64 is just encoding, not encryption. The data can be easily decoded by anyone.
Why does Base64 increase data size?
Base64 increases size by approximately 33% because it uses only 64 characters to represent complete binary data.
What is URL Safe Base64?
It's a variant that replaces '+' with '-' and '/' with '_', making it safe for use in URLs without needing escape.
What is padding with '=' for?
Padding ensures the length is a multiple of 4, necessary for correct decoding in some systems.