Base64 Encoder/Decoder
Encode and decode Base64 strings instantly
Encode to Base64
Decode from Base64
About Base64
What is Base64?
Base64 is a binary-to-text encoding scheme that represents binary data in ASCII string format. It's commonly used for encoding data in emails, URLs, and data URIs.
Common Uses
- • Embedding images in HTML/CSS
- • Encoding data in URLs
- • Email attachments
- • API authentication tokens
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that converts binary data into ASCII string format. It's commonly used to transmit binary data over text-based protocols like email, URLs, and JSON, which don't support binary data directly. The encoding uses 64 ASCII characters (A-Z, a-z, 0-9, +, /) to represent binary data.
Our free Base64 encoder/decoder tool works entirely in your browser, ensuring your data stays private and secure. It's perfect for developers working with APIs, data transmission, authentication tokens, and embedding images in HTML/CSS.
Common Use Cases
Embed Images in HTML/CSS
Convert images to data URIs for inline embedding, reducing HTTP requests and improving load times.
Authentication Tokens
Encode credentials and tokens for HTTP Basic Authentication and JWT tokens in API requests.
Email Attachments
Transfer binary files via email using MIME protocols that require text-based encoding.
Store Binary in Text
Save binary data in JSON, XML, or text databases that only support text formats.
How Base64 Works
Base64 encoding converts every 3 bytes (24 bits) of binary data into 4 ASCII characters (6 bits each). This results in approximately 33% increase in data size, which is the trade-off for text compatibility.
Example:
Original Text: "Hello"
Base64 Encoded: "SGVsbG8="
Frequently Asked Questions
Is Base64 encryption?
No! Base64 is encoding, not encryption. It's easily reversible and provides no security. Never use it to protect sensitive data.
Why does Base64 end with "=" symbols?
The "=" is padding to ensure the output length is a multiple of 4 characters, which Base64 requires.
Can I encode images?
Yes, but use a specialized tool for file encoding. This tool is designed for text data. For images, look for Base64 image encoders.
Is my data secure?
Yes! All encoding/decoding happens in your browser. Nothing is sent to our servers or stored anywhere.