Base64 Converter
Encode text to Base64 or decode Base64 strings to text. Perfect for web development, API integration, and data processing
About Base64 Encoding
Base64 is a binary-to-text encoding scheme that represents binary data as ASCII strings. It's commonly used for encoding data in email, URLs, and storing complex data in text format.
Use cases: Email attachments, data URLs, JSON Web Tokens (JWT), API authentication, and storing binary data in databases.
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in ASCII string format. It uses 64 characters (A-Z, a-z, 0-9, +, /) to encode data, making it safe for transmission over text-based protocols like HTTP and email.
Common Use Cases for Base64
- Email attachments (MIME encoding)
- Data URLs for embedding images in CSS/HTML
- JSON Web Tokens (JWT) encoding
- API authentication and authorization
- Storing binary data in databases
- Web development and data transmission
How to Use Our Base64 Converter
- Choose Encode to Base64 to convert text to Base64 format
- Choose Decode from Base64 to convert Base64 back to text
- Enter your text or Base64 string in the input field
- Click the convert button to see the result
- Copy the result using the copy button
Why Use Our Base64 Tool?
Our Base64 converter is fast, secure, and works entirely in your browser. No data is sent to our servers, ensuring your privacy and security. The tool supports both encoding and decoding operations with instant results and easy copy functionality.
Base64 vs Other Encodings
Unlike hexadecimal encoding which uses 16 characters, Base64 uses 64 characters making it more efficient for representing binary data. It is also more readable than raw binary data and is widely supported across different systems and programming languages.
Frequently Asked Questions
What is Base64 encoding?
Base64 is an encoding scheme that converts binary data into a string of ASCII characters using a 64-character alphabet (A–Z, a–z, 0–9, +, /). It is widely used to safely transmit binary data over text-based protocols like email and HTTP.
Is Base64 the same as encryption?
No. Base64 is an encoding scheme, not an encryption algorithm. It transforms data into a different format but provides no security — anyone can decode a Base64 string without a key.
Why does Base64 use "=" padding characters?
Base64 encodes 3 bytes into 4 characters. When the input length is not a multiple of 3, padding characters (=) are appended to make the output length a multiple of 4.
What is the difference between Base64 and Base64URL?
Base64URL replaces + with - and / with _ so the encoded string is safe in URLs and filenames without percent-encoding. It is commonly used in JWTs and OAuth tokens.
How much larger is Base64 output compared to the original?
Base64 encoding increases data size by approximately 33%. Every 3 bytes of input becomes 4 bytes of Base64 output, plus optional padding.
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